mobilizon.chapril.org-mobil.../lib/mobilizon/events/events.ex

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defmodule Mobilizon.Events do
@moduledoc """
The Events context.
"""
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import Geo.PostGIS
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import Ecto.Query
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import EctoEnum
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import Mobilizon.Storage.Ecto
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alias Ecto.{Changeset, Multi}
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alias Mobilizon.Actors.{Actor, Follower}
alias Mobilizon.Addresses.Address
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alias Mobilizon.Events.{
Comment,
Event,
EventParticipantStats,
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FeedToken,
Participant,
Session,
Tag,
TagRelation,
Track
}
alias Mobilizon.Service.Workers
alias Mobilizon.Share
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alias Mobilizon.Storage.{Page, Repo}
alias Mobilizon.Users.User
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alias Mobilizon.Web.Email
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defenum(EventVisibility, :event_visibility, [
:public,
:unlisted,
:restricted,
:private
])
defenum(JoinOptions, :join_options, [
:free,
:restricted,
:invite
])
defenum(EventStatus, :event_status, [
:tentative,
:confirmed,
:cancelled
])
defenum(EventCategory, :event_category, [
:business,
:conference,
:birthday,
:demonstration,
:meeting
])
defenum(CommentVisibility, :comment_visibility, [
:public,
:unlisted,
:private,
:moderated,
:invite
])
defenum(CommentModeration, :comment_moderation, [
:allow_all,
:moderated,
:closed
])
defenum(ParticipantRole, :participant_role, [
:not_approved,
:not_confirmed,
:rejected,
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:participant,
:moderator,
:administrator,
:creator
])
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@public_visibility [:public, :unlisted]
@event_preloads [
:organizer_actor,
:attributed_to,
:mentions,
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:sessions,
:tracks,
:tags,
:comments,
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:participants,
:physical_address,
:picture
]
@comment_preloads [
:actor,
:event,
:attributed_to,
:in_reply_to_comment,
:origin_comment,
:replies,
:tags,
:mentions
]
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@doc """
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Gets a single event.
"""
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@spec get_event(integer | String.t()) :: {:ok, Event.t()} | {:error, :event_not_found}
def get_event(id) do
case Repo.get(Event, id) do
%Event{} = event ->
{:ok, event}
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nil ->
{:error, :event_not_found}
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end
end
@doc """
Gets a single event.
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Raises `Ecto.NoResultsError` if the event does not exist.
"""
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@spec get_event!(integer | String.t()) :: Event.t()
def get_event!(id), do: Repo.get!(Event, id)
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@doc """
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Gets a single event, with all associations loaded.
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"""
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@spec get_event_with_preload(integer | String.t()) ::
{:ok, Event.t()} | {:error, :event_not_found}
def get_event_with_preload(id) do
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case Repo.get(Event, id) do
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%Event{} = event ->
{:ok, Repo.preload(event, @event_preloads)}
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nil ->
{:error, :event_not_found}
end
end
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@doc """
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Gets a single event, with all associations loaded.
Raises `Ecto.NoResultsError` if the event does not exist.
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"""
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@spec get_event_with_preload!(integer | String.t()) :: Event.t()
def get_event_with_preload!(id) do
Event
|> Repo.get!(id)
|> Repo.preload(@event_preloads)
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end
@doc """
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Gets an event by its URL.
"""
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@spec get_event_by_url(String.t()) :: Event.t() | nil
def get_event_by_url(url) do
url
|> event_by_url_query()
|> Repo.one()
end
@doc """
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Gets an event by its URL.
Raises `Ecto.NoResultsError` if the event does not exist.
"""
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@spec get_event_by_url!(String.t()) :: Event.t()
def get_event_by_url!(url) do
url
|> event_by_url_query()
|> Repo.one!()
end
@doc """
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Gets an event by its URL, with all associations loaded.
"""
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@spec get_public_event_by_url_with_preload(String.t()) ::
{:ok, Event.t()} | {:error, :event_not_found}
def get_public_event_by_url_with_preload(url) do
event =
url
|> event_by_url_query()
|> filter_public_visibility()
|> filter_draft()
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|> preload_for_event()
|> Repo.one()
case event do
%Event{} = event ->
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{:ok, event}
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nil ->
{:error, :event_not_found}
end
end
@doc """
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Gets an event by its URL, with all associations loaded.
Raises `Ecto.NoResultsError` if the event does not exist.
"""
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@spec get_public_event_by_url_with_preload(String.t()) :: Event.t()
def get_public_event_by_url_with_preload!(url) do
url
|> event_by_url_query()
|> filter_public_visibility()
|> filter_draft()
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|> preload_for_event()
|> Repo.one!()
end
@doc """
Gets a public event by its UUID, with all associations loaded.
"""
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@spec get_public_event_by_uuid_with_preload(String.t()) :: Event.t() | nil
def get_public_event_by_uuid_with_preload(uuid) do
uuid
|> event_by_uuid_query()
|> filter_public_visibility()
|> filter_draft()
|> preload_for_event()
|> Repo.one()
end
@spec check_if_event_has_instance_follow(String.t(), integer()) :: boolean()
def check_if_event_has_instance_follow(event_uri, follower_actor_id) do
Share
|> join(:inner, [s], f in Follower, on: f.target_actor_id == s.actor_id)
|> where([s, f], f.actor_id == ^follower_actor_id and s.uri == ^event_uri)
|> Repo.exists?()
end
@doc """
Gets an event by its UUID, with all associations loaded.
"""
@spec get_own_event_by_uuid_with_preload(String.t(), integer()) :: Event.t() | nil
def get_own_event_by_uuid_with_preload(uuid, user_id) do
uuid
|> event_by_uuid_query()
|> user_events_query(user_id)
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|> preload_for_event()
|> Repo.one()
end
@doc """
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Gets an actor's eventual upcoming public event.
"""
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@spec get_upcoming_public_event_for_actor(Actor.t(), String.t() | nil) :: Event.t() | nil
def get_upcoming_public_event_for_actor(%Actor{id: actor_id}, not_event_uuid \\ nil) do
actor_id
|> upcoming_public_event_for_actor_query()
|> filter_public_visibility()
|> filter_not_event_uuid(not_event_uuid)
|> filter_draft()
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|> Repo.one()
end
def get_or_create_event(%{"url" => url} = attrs) do
case Repo.get_by(Event, url: url) do
%Event{} = event -> {:ok, Repo.preload(event, @event_preloads)}
nil -> create_event(attrs)
end
end
@doc """
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Creates an event.
"""
@spec create_event(map) :: {:ok, Event.t()} | {:error, Changeset.t()}
def create_event(attrs \\ %{}) do
with {:ok, %{insert: %Event{} = event}} <- do_create_event(attrs),
%Event{} = event <- Repo.preload(event, @event_preloads) do
unless event.draft,
do: Workers.BuildSearch.enqueue(:insert_search_event, %{"event_id" => event.id})
{:ok, event}
else
err -> err
end
end
# We start by inserting the event and then insert a first participant if the event is not a draft
@spec do_create_event(map) :: {:ok, Event.t()} | {:error, Changeset.t()}
defp do_create_event(attrs) do
Multi.new()
|> Multi.insert(:insert, Event.changeset(%Event{}, attrs))
|> Multi.run(:write, fn _repo, %{insert: %Event{draft: draft} = event} ->
with {:is_draft, false} <- {:is_draft, draft},
{:ok, %Participant{} = participant} <-
create_participant(
%{
event_id: event.id,
role: :creator,
actor_id: event.organizer_actor_id
},
false
) do
{:ok, participant}
else
{:is_draft, true} -> {:ok, nil}
err -> err
end
end)
|> Repo.transaction()
end
@doc """
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Updates an event.
We start by updating the event and then insert a first participant if the event is not a draft anymore
"""
@spec update_event(Event.t(), map) :: {:ok, Event.t()} | {:error, Changeset.t()}
def update_event(%Event{draft: old_draft} = old_event, attrs) do
with %Changeset{changes: changes} = changeset <-
Event.update_changeset(Repo.preload(old_event, :tags), attrs),
{:ok, %{update: %Event{} = new_event}} <-
Multi.new()
|> Multi.update(:update, changeset)
|> Multi.run(:write, fn _repo, %{update: %Event{draft: draft} = event} ->
with {:was_draft, true} <- {:was_draft, old_draft == true && draft == false},
{:ok, %Participant{} = participant} <-
create_participant(
%{
event_id: event.id,
role: :creator,
actor_id: event.organizer_actor_id
},
false
) do
{:ok, participant}
else
{:was_draft, false} -> {:ok, nil}
err -> err
end
end)
|> Repo.transaction() do
Cachex.del(:ics, "event_#{new_event.uuid}")
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Email.Event.calculate_event_diff_and_send_notifications(
old_event,
new_event,
changes
)
unless new_event.draft,
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do: Workers.BuildSearch.enqueue(:update_search_event, %{"event_id" => new_event.id})
{:ok, Repo.preload(new_event, @event_preloads)}
end
end
@doc """
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Deletes an event.
"""
@spec delete_event(Event.t()) :: {:ok, Event.t()} | {:error, Changeset.t()}
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def delete_event(%Event{} = event), do: Repo.delete(event)
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@doc """
Deletes an event.
Raises an exception if it fails.
"""
@spec delete_event(Event.t()) :: Event.t()
def delete_event!(%Event{} = event), do: Repo.delete!(event)
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@doc """
Returns the list of events.
"""
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@spec list_events(integer | nil, integer | nil, atom, atom, boolean, boolean) :: [Event.t()]
def list_events(
page \\ nil,
limit \\ nil,
sort \\ :begins_on,
direction \\ :asc,
is_unlisted \\ false,
is_future \\ true
) do
query = from(e in Event, preload: [:organizer_actor, :participants])
query
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|> Page.paginate(page, limit)
|> sort(sort, direction)
|> filter_future_events(is_future)
|> filter_unlisted(is_unlisted)
|> filter_draft()
|> filter_local_or_from_followed_instances_events()
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|> Repo.all()
end
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@doc """
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Returns the list of events with the same tags.
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"""
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@spec list_events_by_tags([Tag.t()], integer) :: [Event.t()]
def list_events_by_tags(tags, limit \\ 2) do
tags
|> Enum.map(& &1.id)
|> events_by_tags_query(limit)
|> filter_draft()
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|> Repo.all()
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end
@doc """
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Lists public events for the actor, with all associations loaded.
"""
@spec list_public_events_for_actor(Actor.t(), integer | nil, integer | nil) ::
{:ok, [Event.t()], integer}
def list_public_events_for_actor(%Actor{id: actor_id}, page \\ nil, limit \\ nil) do
events =
actor_id
|> event_for_actor_query()
|> filter_public_visibility()
|> filter_draft()
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|> preload_for_event()
|> Page.paginate(page, limit)
|> Repo.all()
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events_count =
actor_id
|> count_events_for_actor_query()
|> Repo.one()
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{:ok, events, events_count}
end
@spec list_drafts_for_user(integer, integer | nil, integer | nil) :: [Event.t()]
def list_drafts_for_user(user_id, page \\ nil, limit \\ nil) do
Event
|> user_events_query(user_id)
|> filter_draft(true)
|> Page.paginate(page, limit)
|> Repo.all()
end
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@doc """
Finds close events to coordinates.
Radius is in meters and defaults to 50km.
"""
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@spec find_close_events(number, number, number, number) :: [Event.t()]
def find_close_events(lon, lat, radius \\ 50_000, srid \\ 4326) do
"SRID=#{srid};POINT(#{lon} #{lat})"
|> Geo.WKT.decode!()
|> close_events_query(radius)
|> filter_draft()
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|> Repo.all()
end
@doc """
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Counts local events.
"""
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@spec count_local_events :: integer
def count_local_events do
count_local_events_query()
|> filter_public_visibility()
|> filter_draft()
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|> Repo.one()
end
@doc """
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Builds a page struct for events by their name.
"""
@spec build_events_for_search(String.t(), integer | nil, integer | nil) :: Page.t()
def build_events_for_search(name, page \\ nil, limit \\ nil)
def build_events_for_search("", _page, _limit), do: %Page{total: 0, elements: []}
def build_events_for_search(name, page, limit) do
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name
|> normalize_search_string()
|> events_for_search_query()
|> filter_local_or_from_followed_instances_events()
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|> Page.build_page(page, limit)
end
@doc """
Gets a single tag.
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"""
@spec get_tag(integer | String.t()) :: Tag.t() | nil
def get_tag(id), do: Repo.get(Tag, id)
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@doc """
Gets a single tag.
Raises `Ecto.NoResultsError` if the tag does not exist.
"""
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@spec get_tag!(integer | String.t()) :: Tag.t()
def get_tag!(id), do: Repo.get!(Tag, id)
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@doc """
Gets a tag by its slug.
"""
@spec get_tag_by_slug(String.t()) :: Tag.t() | nil
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def get_tag_by_slug(slug) do
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slug
|> tag_by_slug_query()
|> Repo.one()
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end
@doc """
Gets a tag by its title.
"""
@spec get_tag_by_title(String.t()) :: Tag.t() | nil
def get_tag_by_title(slug) do
slug
|> tag_by_title_query()
|> Repo.one()
end
@doc """
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Gets an existing tag or creates the new one.
"""
@spec get_or_create_tag(map) :: {:ok, Tag.t()} | {:error, Changeset.t()}
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def get_or_create_tag(%{"name" => "#" <> title}) do
case Repo.get_by(Tag, title: title) do
%Tag{} = tag ->
{:ok, tag}
nil ->
create_tag(%{"title" => title})
end
end
@doc """
Gets an existing tag or creates the new one.
"""
@spec get_or_create_tag(String.t()) :: {:ok, Tag.t()} | {:error, Changeset.t()}
def get_or_create_tag(title) do
case Repo.get_by(Tag, title: title) do
%Tag{} = tag ->
{:ok, tag}
nil ->
create_tag(%{"title" => title})
end
end
@doc """
Creates a tag.
"""
@spec create_tag(map) :: {:ok, Tag.t()} | {:error, Changeset.t()}
def create_tag(attrs \\ %{}) do
%Tag{}
|> Tag.changeset(attrs)
|> Repo.insert()
end
@doc """
Updates a tag.
"""
@spec update_tag(Tag.t(), map) :: {:ok, Tag.t()} | {:error, Changeset.t()}
def update_tag(%Tag{} = tag, attrs) do
tag
|> Tag.changeset(attrs)
|> Repo.update()
end
@doc """
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Deletes a tag.
"""
@spec delete_tag(Tag.t()) :: {:ok, Tag.t()} | {:error, Changeset.t()}
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def delete_tag(%Tag{} = tag), do: Repo.delete(tag)
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@doc """
Returns the list of tags.
"""
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@spec list_tags(integer | nil, integer | nil) :: [Tag.t()]
def list_tags(page \\ nil, limit \\ nil) do
Tag
|> Page.paginate(page, limit)
|> Repo.all()
end
@doc """
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Returns the list of tags for the event.
"""
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@spec list_tags_for_event(integer | String.t(), integer | nil, integer | nil) :: [Tag.t()]
def list_tags_for_event(event_id, page \\ nil, limit \\ nil) do
event_id
|> tags_for_event_query()
|> Page.paginate(page, limit)
|> Repo.all()
end
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@doc """
Checks whether two tags are linked or not.
"""
@spec are_tags_linked(Tag.t(), Tag.t()) :: boolean
def are_tags_linked(%Tag{id: tag1_id}, %Tag{id: tag2_id}) do
tag_relation =
tag1_id
|> tags_linked_query(tag2_id)
|> Repo.one()
!!tag_relation
end
@doc """
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Creates a relation between two tags.
"""
@spec create_tag_relation(map) :: {:ok, TagRelation.t()} | {:error, Changeset.t()}
def create_tag_relation(attrs \\ {}) do
%TagRelation{}
|> TagRelation.changeset(attrs)
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|> Repo.insert(
conflict_target: [:tag_id, :link_id],
on_conflict: [inc: [weight: 1]]
)
end
@doc """
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Removes a tag relation.
"""
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@spec delete_tag_relation(TagRelation.t()) ::
{:ok, TagRelation.t()} | {:error, Changeset.t()}
def delete_tag_relation(%TagRelation{} = tag_relation) do
Repo.delete(tag_relation)
end
@doc """
Returns the tags neighbors for a given tag
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We can't rely on the single many_to_many relation since we also want tags that
link to our tag, not just tags linked by this one.
The SQL query looks like this:
```sql
SELECT * FROM tags t
RIGHT JOIN (
SELECT weight, link_id AS id
FROM tag_relations t2
WHERE tag_id = 1
UNION ALL
SELECT tag_id AS id, weight
FROM tag_relations t2
WHERE link_id = 1
) tr
ON t.id = tr.id
ORDER BY tr.weight
DESC;
```
"""
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@spec list_tag_neighbors(Tag.t(), integer, integer) :: [Tag.t()]
def list_tag_neighbors(%Tag{id: tag_id}, relation_minimum \\ 1, limit \\ 10) do
tag_id
|> tag_relation_subquery()
|> tag_relation_union_subquery(tag_id)
|> tag_neighbors_query(relation_minimum, limit)
|> Repo.all()
end
@doc """
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Gets a single participant.
## Examples
iex> get_participant(123)
%Participant{}
iex> get_participant(456)
nil
"""
@spec get_participant(integer) :: Participant.t()
def get_participant(participant_id) do
Participant
|> where([p], p.id == ^participant_id)
|> preload([p], [:event, :actor])
|> Repo.one()
end
@doc """
Gets a single participation for an event and actor.
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"""
@spec get_participant(integer | String.t(), integer | String.t(), map()) ::
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{:ok, Participant.t()} | {:error, :participant_not_found}
def get_participant(event_id, actor_id, params \\ %{})
# This one if to check someone doesn't go to the same event twice
def get_participant(event_id, actor_id, %{email: email}) do
case Participant
|> where([p], event_id: ^event_id, actor_id: ^actor_id)
|> where([p], fragment("? ->>'email' = ?", p.metadata, ^email))
|> Repo.one() do
%Participant{} = participant ->
{:ok, participant}
nil ->
{:error, :participant_not_found}
end
end
# This one if for finding participants by their cancellation token when wanting to cancel a participation
def get_participant(event_id, actor_id, %{cancellation_token: cancellation_token}) do
case Participant
|> where([p], event_id: ^event_id, actor_id: ^actor_id)
|> where([p], fragment("? ->>'cancellation_token' = ?", p.metadata, ^cancellation_token))
|> Repo.one() do
%Participant{} = participant ->
{:ok, participant}
nil ->
{:error, :participant_not_found}
end
end
def get_participant(event_id, actor_id, %{}) do
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case Repo.get_by(Participant, event_id: event_id, actor_id: actor_id) do
%Participant{} = participant ->
{:ok, participant}
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nil ->
{:error, :participant_not_found}
end
end
@spec get_participant_by_confirmation_token(String.t()) :: Participant.t()
def get_participant_by_confirmation_token(confirmation_token) do
Participant
|> where([p], fragment("? ->>'confirmation_token' = ?", p.metadata, ^confirmation_token))
|> preload([p], [:actor, :event])
|> Repo.one()
end
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@doc """
Gets a single participation for an event and actor.
Raises `Ecto.NoResultsError` if the Participant does not exist.
## Examples
iex> get_participant!(123, 19)
%Participant{}
iex> get_participant!(456, 5)
** (Ecto.NoResultsError)
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"""
@spec get_participant!(integer | String.t(), integer | String.t()) :: Participant.t()
def get_participant!(event_id, actor_id) do
Repo.get_by!(Participant, event_id: event_id, actor_id: actor_id)
end
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@doc """
Gets a participant by its URL.
"""
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@spec get_participant_by_url(String.t()) :: Participant.t() | nil
def get_participant_by_url(url) do
url
|> participant_by_url_query()
|> Repo.one()
end
@default_participant_roles [:participant, :moderator, :administrator, :creator]
@doc """
Returns the list of participants for an event.
Default behaviour is to not return :not_approved or :not_confirmed participants
"""
@spec list_participants_for_event(String.t(), list(atom()), integer | nil, integer | nil) ::
Page.t()
def list_participants_for_event(
id,
roles \\ @default_participant_roles,
page \\ nil,
limit \\ nil
) do
id
|> list_participants_for_event_query()
|> filter_role(roles)
|> Page.build_page(page, limit)
end
@spec list_actors_participants_for_event(String.t()) :: [Actor.t()]
def list_actors_participants_for_event(id) do
id
|> list_participant_actors_for_event_query
|> Repo.all()
end
@doc """
Returns the list of participations for an actor.
Default behaviour is to not return :not_approved participants
## Examples
iex> list_event_participations_for_user(5)
[%Participant{}, ...]
"""
@spec list_participations_for_user(
integer,
DateTime.t() | nil,
DateTime.t() | nil,
integer | nil,
integer | nil
) :: list(Participant.t())
def list_participations_for_user(user_id, after_datetime, before_datetime, page, limit) do
user_id
|> list_participations_for_user_query()
|> participation_filter_begins_on(after_datetime, before_datetime)
|> Page.paginate(page, limit)
|> Repo.all()
end
@doc """
Returns the list of moderator participants for an event.
## Examples
iex> moderator_for_event?(5, 3)
true
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"""
@spec moderator_for_event?(integer, integer) :: boolean
def moderator_for_event?(event_id, actor_id) do
!(Repo.one(
from(
p in Participant,
where:
p.event_id == ^event_id and
p.actor_id ==
^actor_id and p.role in ^[:moderator, :administrator, :creator]
)
) == nil)
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end
@doc """
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Returns the list of organizers participants for an event.
## Examples
iex> list_organizers_participants_for_event(id)
[%Participant{role: :creator}, ...]
"""
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@spec list_organizers_participants_for_event(
integer | String.t(),
integer | nil,
integer | nil
) ::
[Participant.t()]
def list_organizers_participants_for_event(event_id, page \\ nil, limit \\ nil) do
event_id
|> organizers_participants_for_event()
|> Page.paginate(page, limit)
|> Repo.all()
end
@doc """
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Returns the list of event participation requests for an actor.
"""
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@spec list_requests_for_actor(Actor.t()) :: [Participant.t()]
def list_requests_for_actor(%Actor{id: actor_id}) do
actor_id
|> requests_for_actor_query()
|> Repo.all()
end
@doc """
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Returns the list of participations for an actor.
"""
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@spec list_event_participations_for_actor(Actor.t(), integer | nil, integer | nil) ::
[Participant.t()]
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def list_event_participations_for_actor(%Actor{id: actor_id}, page \\ nil, limit \\ nil) do
actor_id
|> event_participations_for_actor_query()
|> Page.paginate(page, limit)
|> Repo.all()
end
@doc """
Counts approved participants.
"""
@spec count_approved_participants(integer | String.t()) :: integer
def count_approved_participants(event_id) do
event_id
|> count_participants_query()
|> filter_approved_role()
|> Repo.aggregate(:count, :id)
end
@doc """
Counts participant participants (participants with no extra role)
"""
@spec count_participant_participants(integer | String.t()) :: integer
def count_participant_participants(event_id) do
event_id
|> count_participants_query()
|> filter_participant_role()
|> Repo.aggregate(:count, :id)
end
@doc """
Counts rejected participants.
"""
@spec count_rejected_participants(integer | String.t()) :: integer
def count_rejected_participants(event_id) do
event_id
|> count_participants_query()
|> filter_rejected_role()
|> Repo.aggregate(:count, :id)
end
@doc """
Gets the default participant role depending on the event join options.
"""
@spec get_default_participant_role(Event.t()) :: :participant | :not_approved
def get_default_participant_role(%Event{join_options: :free}), do: :participant
def get_default_participant_role(%Event{join_options: _}), do: :not_approved
@doc """
Creates a participant.
"""
@spec create_participant(map) :: {:ok, Participant.t()} | {:error, Changeset.t()}
def create_participant(attrs \\ %{}, update_event_participation_stats \\ true) do
with {:ok, %{participant: %Participant{} = participant}} <-
Multi.new()
|> Multi.insert(:participant, Participant.changeset(%Participant{}, attrs))
|> Multi.run(:update_event_participation_stats, fn _repo,
%{
participant:
%Participant{role: new_role} =
participant
} ->
update_participant_stats(
participant,
nil,
new_role,
update_event_participation_stats
)
end)
|> Repo.transaction() do
{:ok, Repo.preload(participant, [:event, :actor])}
end
end
@doc """
Updates a participant.
"""
@spec update_participant(Participant.t(), map) ::
{:ok, Participant.t()} | {:error, Changeset.t()}
def update_participant(%Participant{role: old_role} = participant, attrs) do
with {:ok, %{participant: %Participant{} = participant}} <-
Multi.new()
|> Multi.update(:participant, Participant.changeset(participant, attrs))
|> Multi.run(:update_event_participation_stats, fn _repo,
%{
participant:
%Participant{role: new_role} =
participant
} ->
update_participant_stats(participant, old_role, new_role)
end)
|> Repo.transaction() do
{:ok, Repo.preload(participant, [:event, :actor])}
end
end
@doc """
Deletes a participant.
"""
@spec delete_participant(Participant.t()) ::
{:ok, Participant.t()} | {:error, Changeset.t()}
def delete_participant(%Participant{role: old_role} = participant) do
with {:ok, %{participant: %Participant{} = participant}} <-
Multi.new()
|> Multi.delete(:participant, participant)
|> Multi.run(:update_event_participation_stats, fn _repo,
%{
participant:
%Participant{} = participant
} ->
update_participant_stats(participant, old_role, nil)
end)
|> Repo.transaction() do
{:ok, participant}
end
end
defp update_participant_stats(
%Participant{
event_id: event_id
} = _participant,
old_role,
new_role,
update_event_participation_stats \\ true
) do
with {:update_event_participation_stats, true} <-
{:update_event_participation_stats, update_event_participation_stats},
{:ok, %Event{} = event} <- get_event(event_id),
%EventParticipantStats{} = participant_stats <-
Map.get(event, :participant_stats),
%EventParticipantStats{} = participant_stats <-
do_update_participant_stats(participant_stats, old_role, new_role),
{:ok, %Event{} = event} <-
event
|> Event.update_changeset(%{
participant_stats: Map.from_struct(participant_stats)
})
|> Repo.update() do
{:ok, event}
else
{:update_event_participation_stats, false} ->
{:ok, nil}
{:error, :event_not_found} ->
{:error, :event_not_found}
err ->
{:error, err}
end
end
defp do_update_participant_stats(participant_stats, old_role, new_role) do
participant_stats
|> decrease_participant_stats(old_role)
|> increase_participant_stats(new_role)
end
defp increase_participant_stats(participant_stats, nil), do: participant_stats
defp increase_participant_stats(participant_stats, role),
do: Map.update(participant_stats, role, 0, &(&1 + 1))
defp decrease_participant_stats(participant_stats, nil), do: participant_stats
defp decrease_participant_stats(participant_stats, role),
do: Map.update(participant_stats, role, 0, &(&1 - 1))
@doc """
Gets a single session.
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Raises `Ecto.NoResultsError` if the session does not exist.
"""
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@spec get_session!(integer | String.t()) :: Session.t()
def get_session!(id), do: Repo.get!(Session, id)
@doc """
Creates a session.
"""
@spec create_session(map) :: {:ok, Session.t()} | {:error, Changeset.t()}
def create_session(attrs \\ %{}) do
%Session{}
|> Session.changeset(attrs)
|> Repo.insert()
end
@doc """
Updates a session.
"""
@spec update_session(Session.t(), map) :: {:ok, Session.t()} | {:error, Changeset.t()}
def update_session(%Session{} = session, attrs) do
session
|> Session.changeset(attrs)
|> Repo.update()
end
@doc """
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Deletes a session.
"""
@spec delete_session(Session.t()) :: {:ok, Session.t()} | {:error, Changeset.t()}
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def delete_session(%Session{} = session), do: Repo.delete(session)
@doc """
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Returns the list of sessions.
"""
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@spec list_sessions :: [Session.t()]
def list_sessions, do: Repo.all(Session)
@doc """
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Returns the list of sessions for the event.
"""
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@spec list_sessions_for_event(Event.t()) :: [Session.t()]
def list_sessions_for_event(%Event{id: event_id}) do
event_id
|> sessions_for_event_query()
|> Repo.all()
end
@doc """
Gets a single track.
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Raises `Ecto.NoResultsError` if the track does not exist.
"""
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@spec get_track!(integer | String.t()) :: Track.t()
def get_track!(id), do: Repo.get!(Track, id)
@doc """
Creates a track.
"""
@spec create_track(map) :: {:ok, Track.t()} | {:error, Changeset.t()}
def create_track(attrs \\ %{}) do
%Track{}
|> Track.changeset(attrs)
|> Repo.insert()
end
@doc """
Updates a track.
"""
@spec update_track(Track.t(), map) :: {:ok, Track.t()} | {:error, Changeset.t()}
def update_track(%Track{} = track, attrs) do
track
|> Track.changeset(attrs)
|> Repo.update()
end
@doc """
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Deletes a track.
"""
@spec delete_track(Track.t()) :: {:ok, Track.t()} | {:error, Changeset.t()}
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def delete_track(%Track{} = track), do: Repo.delete(track)
@doc """
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Returns the list of tracks.
"""
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@spec list_tracks :: [Track.t()]
def list_tracks, do: Repo.all(Track)
@doc """
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Returns the list of sessions for the track.
"""
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@spec list_sessions_for_track(Track.t()) :: [Session.t()]
def list_sessions_for_track(%Track{id: track_id}) do
track_id
|> sessions_for_track_query()
|> Repo.all()
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end
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def data do
Dataloader.Ecto.new(Repo, query: &query/2)
end
@doc """
Query for comment dataloader
We only get first comment of thread, and count replies.
Read: https://hexdocs.pm/absinthe/ecto.html#dataloader
"""
def query(Comment, _params) do
Comment
|> join(:left, [c], r in Comment, on: r.origin_comment_id == c.id)
|> where([c, _], is_nil(c.in_reply_to_comment_id))
|> where([_, r], is_nil(r.deleted_at))
|> group_by([c], c.id)
|> select([c, r], %{c | total_replies: count(r.id)})
end
def query(queryable, _) do
queryable
end
@doc """
Gets a single comment.
"""
@spec get_comment(integer | String.t()) :: Comment.t()
def get_comment(nil), do: nil
def get_comment(id), do: Repo.get(Comment, id)
@doc """
Gets a single comment.
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Raises `Ecto.NoResultsError` if the comment does not exist.
"""
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@spec get_comment!(integer | String.t()) :: Comment.t()
def get_comment!(id), do: Repo.get!(Comment, id)
def get_comment_with_preload(nil), do: nil
def get_comment_with_preload(id) do
Comment
|> where(id: ^id)
|> preload_for_comment()
|> Repo.one()
end
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@doc """
Gets a comment by its URL.
"""
@spec get_comment_from_url(String.t()) :: Comment.t() | nil
def get_comment_from_url(url), do: Repo.get_by(Comment, url: url)
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@doc """
Gets a comment by its URL.
Raises `Ecto.NoResultsError` if the comment does not exist.
"""
@spec get_comment_from_url!(String.t()) :: Comment.t()
def get_comment_from_url!(url), do: Repo.get_by!(Comment, url: url)
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@doc """
Gets a comment by its URL, with all associations loaded.
"""
@spec get_comment_from_url_with_preload(String.t()) ::
{:ok, Comment.t()} | {:error, :comment_not_found}
def get_comment_from_url_with_preload(url) do
query = from(c in Comment, where: c.url == ^url)
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comment =
query
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|> preload_for_comment()
|> Repo.one()
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case comment do
%Comment{} = comment ->
{:ok, comment}
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nil ->
{:error, :comment_not_found}
end
end
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@doc """
Gets a comment by its URL, with all associations loaded.
Raises `Ecto.NoResultsError` if the comment does not exist.
"""
@spec get_comment_from_url_with_preload(String.t()) :: Comment.t()
def get_comment_from_url_with_preload!(url) do
Comment
|> Repo.get_by!(url: url)
|> Repo.preload(@comment_preloads)
end
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@doc """
Gets a comment by its UUID, with all associations loaded.
"""
@spec get_comment_from_uuid_with_preload(String.t()) :: Comment.t()
def get_comment_from_uuid_with_preload(uuid) do
Comment
|> Repo.get_by(uuid: uuid)
|> Repo.preload(@comment_preloads)
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end
def get_threads(event_id) do
Comment
|> where([c, _], c.event_id == ^event_id and is_nil(c.origin_comment_id))
|> join(:left, [c], r in Comment, on: r.origin_comment_id == c.id)
|> group_by([c], c.id)
|> select([c, r], %{c | total_replies: count(r.id)})
|> Repo.all()
end
@doc """
Gets paginated replies for root comment
"""
@spec get_thread_replies(integer()) :: [Comment.t()]
def get_thread_replies(parent_id) do
parent_id
|> public_replies_for_thread_query()
|> Repo.all()
end
def get_or_create_comment(%{"url" => url} = attrs) do
case Repo.get_by(Comment, url: url) do
%Comment{} = comment -> {:ok, Repo.preload(comment, @comment_preloads)}
nil -> create_comment(attrs)
end
end
@doc """
Creates a comment.
"""
@spec create_comment(map) :: {:ok, Comment.t()} | {:error, Changeset.t()}
def create_comment(attrs \\ %{}) do
with {:ok, %Comment{} = comment} <-
%Comment{}
|> Comment.changeset(attrs)
|> Repo.insert(),
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%Comment{} = comment <- Repo.preload(comment, @comment_preloads) do
{:ok, comment}
end
end
@doc """
Updates a comment.
"""
@spec update_comment(Comment.t(), map) :: {:ok, Comment.t()} | {:error, Changeset.t()}
def update_comment(%Comment{} = comment, attrs) do
comment
|> Comment.changeset(attrs)
|> Repo.update()
end
@doc """
Deletes a comment
But actually just empty the fields so that threads are not broken.
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"""
@spec delete_comment(Comment.t()) :: {:ok, Comment.t()} | {:error, Changeset.t()}
def delete_comment(%Comment{} = comment) do
comment
|> Comment.delete_changeset()
|> Repo.update()
end
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@doc """
Returns the list of public comments.
"""
@spec list_comments :: [Comment.t()]
def list_comments do
Repo.all(from(c in Comment, where: c.visibility == ^:public))
end
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@doc """
Returns the list of public comments for the actor.
"""
@spec list_public_comments_for_actor(Actor.t(), integer | nil, integer | nil) ::
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{:ok, [Comment.t()], integer}
def list_public_comments_for_actor(%Actor{id: actor_id}, page \\ nil, limit \\ nil) do
comments =
actor_id
|> public_comments_for_actor_query()
|> Page.paginate(page, limit)
|> Repo.all()
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count_comments =
actor_id
|> count_comments_query()
|> Repo.one()
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{:ok, comments, count_comments}
end
@doc """
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Returns the list of comments by an actor and a list of ids.
"""
@spec list_comments_by_actor_and_ids(integer | String.t(), [integer | String.t()]) ::
[Comment.t()]
def list_comments_by_actor_and_ids(actor_id, comment_ids \\ [])
def list_comments_by_actor_and_ids(_actor_id, []), do: []
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def list_comments_by_actor_and_ids(actor_id, comment_ids) do
Comment
|> where([c], c.id in ^comment_ids)
|> where([c], c.actor_id == ^actor_id)
|> Repo.all()
end
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@doc """
Counts local comments.
"""
@spec count_local_comments :: integer
def count_local_comments, do: Repo.one(count_local_comments_query())
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@doc """
Gets a single feed token.
"""
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@spec get_feed_token(String.t()) :: FeedToken.t() | nil
def get_feed_token(token) do
token
|> feed_token_query()
|> Repo.one()
end
@doc """
Gets a single feed token.
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Raises `Ecto.NoResultsError` if the feed token does not exist.
"""
@spec get_feed_token!(String.t()) :: FeedToken.t()
def get_feed_token!(token) do
token
|> feed_token_query()
|> Repo.one!()
end
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@doc """
Creates a feed token.
"""
@spec create_feed_token(map) :: {:ok, FeedToken.t()} | {:error, Changeset.t()}
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def create_feed_token(attrs \\ %{}) do
attrs = Map.put(attrs, :token, Ecto.UUID.generate())
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%FeedToken{}
|> FeedToken.changeset(attrs)
|> Repo.insert()
end
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@doc """
Updates a feed token.
"""
@spec update_feed_token(FeedToken.t(), map) ::
{:ok, FeedToken.t()} | {:error, Changeset.t()}
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def update_feed_token(%FeedToken{} = feed_token, attrs) do
feed_token
|> FeedToken.changeset(attrs)
|> Repo.update()
end
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@doc """
Deletes a feed token.
"""
@spec delete_feed_token(FeedToken.t()) :: {:ok, FeedToken.t()} | {:error, Changeset.t()}
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def delete_feed_token(%FeedToken{} = feed_token), do: Repo.delete(feed_token)
@doc """
Returns the list of feed tokens for an user.
"""
@spec list_feed_tokens_for_user(User.t()) :: [FeedTokens.t()]
def list_feed_tokens_for_user(%User{id: user_id}) do
user_id
|> feed_token_for_user_query()
|> Repo.all()
end
@doc """
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Returns the list of feed tokens for an actor.
"""
@spec list_feed_tokens_for_actor(Actor.t()) :: [FeedTokens.t()]
def list_feed_tokens_for_actor(%Actor{id: actor_id, domain: nil}) do
actor_id
|> feed_token_for_actor_query()
|> Repo.all()
end
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@spec event_by_url_query(String.t()) :: Ecto.Query.t()
defp event_by_url_query(url) do
from(e in Event, where: e.url == ^url)
end
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@spec event_by_uuid_query(String.t()) :: Ecto.Query.t()
defp event_by_uuid_query(uuid) do
from(e in Event, where: e.uuid == ^uuid)
end
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@spec event_for_actor_query(integer | String.t()) :: Ecto.Query.t()
defp event_for_actor_query(actor_id) do
from(
e in Event,
where: e.organizer_actor_id == ^actor_id,
order_by: [desc: :id]
)
end
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@spec upcoming_public_event_for_actor_query(integer | String.t()) :: Ecto.Query.t()
defp upcoming_public_event_for_actor_query(actor_id) do
from(
e in Event,
where:
e.organizer_actor_id == ^actor_id and
e.begins_on > ^DateTime.utc_now(),
order_by: [asc: :begins_on],
limit: 1,
preload: [
:organizer_actor,
:tags,
:participants,
:physical_address
]
)
end
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@spec close_events_query(Geo.geometry(), number) :: Ecto.Query.t()
defp close_events_query(point, radius) do
from(
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e in Event,
join: a in Address,
on: a.id == e.physical_address_id,
where: e.visibility == ^:public and st_dwithin_in_meters(^point, a.geom, ^radius),
preload: :organizer_actor
)
end
@spec user_events_query(Ecto.Query.t(), number()) :: Ecto.Query.t()
defp user_events_query(query, user_id) do
from(
e in query,
join: a in Actor,
on: a.id == e.organizer_actor_id,
where: a.user_id == ^user_id
)
end
defmacro matching_event_ids_and_ranks(search_string) do
quote do
fragment(
"""
SELECT event_search.id AS id,
ts_rank(
event_search.document, plainto_tsquery(unaccent(?))
) AS rank
FROM event_search
WHERE event_search.document @@ plainto_tsquery(unaccent(?))
OR event_search.title ILIKE ?
""",
^unquote(search_string),
^unquote(search_string),
^"%#{unquote(search_string)}%"
)
end
end
@spec events_for_search_query(String.t()) :: Ecto.Query.t()
defp events_for_search_query(search_string) do
Event
|> where([e], e.visibility in ^@public_visibility)
|> do_event_for_search_query(search_string)
end
@spec do_event_for_search_query(Ecto.Query.t(), String.t()) :: Ecto.Query.t()
defp do_event_for_search_query(query, search_string) do
from(event in query,
join: id_and_rank in matching_event_ids_and_ranks(search_string),
on: id_and_rank.id == event.id,
order_by: [desc: id_and_rank.rank]
)
end
@spec normalize_search_string(String.t()) :: String.t()
defp normalize_search_string(search_string) do
search_string
|> String.downcase()
|> String.replace(~r/\n/, " ")
|> String.replace(~r/\t/, " ")
|> String.replace(~r/\s{2,}/, " ")
|> String.trim()
end
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@spec events_by_tags_query([integer], integer) :: Ecto.Query.t()
def events_by_tags_query(tags_ids, limit) do
from(
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e in Event,
distinct: e.uuid,
join: te in "events_tags",
on: e.id == te.event_id,
where: e.begins_on > ^DateTime.utc_now(),
where: e.visibility in ^@public_visibility,
where: te.tag_id in ^tags_ids,
order_by: [asc: e.begins_on],
limit: ^limit
)
end
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@spec count_events_for_actor_query(integer | String.t()) :: Ecto.Query.t()
defp count_events_for_actor_query(actor_id) do
from(
e in Event,
select: count(e.id),
where: e.organizer_actor_id == ^actor_id
)
end
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@spec count_local_events_query :: Ecto.Query.t()
defp count_local_events_query do
from(e in Event, select: count(e.id), where: e.local == ^true)
end
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@spec tag_by_slug_query(String.t()) :: Ecto.Query.t()
defp tag_by_slug_query(slug) do
from(t in Tag, where: t.slug == ^slug)
end
@spec tag_by_title_query(String.t()) :: Ecto.Query.t()
defp tag_by_title_query(title) do
from(t in Tag, where: t.title == ^title, limit: 1)
end
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@spec tags_for_event_query(integer) :: Ecto.Query.t()
defp tags_for_event_query(event_id) do
from(
t in Tag,
join: e in "events_tags",
on: t.id == e.tag_id,
where: e.event_id == ^event_id
)
end
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@spec tags_linked_query(integer, integer) :: Ecto.Query.t()
defp tags_linked_query(tag1_id, tag2_id) do
from(
tr in TagRelation,
where:
tr.tag_id == ^min(tag1_id, tag2_id) and
tr.link_id == ^max(tag1_id, tag2_id)
)
end
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@spec tag_relation_subquery(integer) :: Ecto.Query.t()
defp tag_relation_subquery(tag_id) do
from(
tr in TagRelation,
select: %{id: tr.tag_id, weight: tr.weight},
where: tr.link_id == ^tag_id
)
end
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@spec tag_relation_union_subquery(Ecto.Query.t(), integer) :: Ecto.Query.t()
defp tag_relation_union_subquery(subquery, tag_id) do
from(
tr in TagRelation,
select: %{id: tr.link_id, weight: tr.weight},
union_all: ^subquery,
where: tr.tag_id == ^tag_id
)
end
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@spec tag_neighbors_query(Ecto.Query.t(), integer, integer) :: Ecto.Query.t()
defp tag_neighbors_query(subquery, relation_minimum, limit) do
from(
t in Tag,
right_join: q in subquery(subquery),
on: [id: t.id],
where: q.weight >= ^relation_minimum,
limit: ^limit,
order_by: [desc: q.weight]
)
end
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@spec participant_by_url_query(String.t()) :: Ecto.Query.t()
defp participant_by_url_query(url) do
from(
p in Participant,
where: p.url == ^url,
preload: [:actor, :event]
)
end
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defp organizers_participants_for_event(event_id) do
from(
p in Participant,
where: p.event_id == ^event_id and p.role == ^:creator,
preload: [:actor]
)
end
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@spec requests_for_actor_query(integer) :: Ecto.Query.t()
defp requests_for_actor_query(actor_id) do
from(p in Participant, where: p.actor_id == ^actor_id and p.role == ^:not_approved)
end
@spec count_participants_query(integer) :: Ecto.Query.t()
def count_participants_query(event_id) do
from(p in Participant, where: p.event_id == ^event_id)
end
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@spec event_participations_for_actor_query(integer) :: Ecto.Query.t()
def event_participations_for_actor_query(actor_id) do
from(
p in Participant,
join: e in Event,
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on: p.event_id == e.id,
where: p.actor_id == ^actor_id and p.role != ^:not_approved,
preload: [:event]
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)
end
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@spec sessions_for_event_query(integer) :: Ecto.Query.t()
defp sessions_for_event_query(event_id) do
from(
s in Session,
join: e in Event,
on: s.event_id == e.id,
where: e.id == ^event_id
)
end
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@spec sessions_for_track_query(integer) :: Ecto.Query.t()
defp sessions_for_track_query(track_id) do
from(s in Session, where: s.track_id == ^track_id)
end
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defp public_comments_for_actor_query(actor_id) do
Comment
|> where([c], c.actor_id == ^actor_id and c.visibility in ^@public_visibility)
|> order_by([c], desc: :id)
|> preload_for_comment()
end
defp public_replies_for_thread_query(comment_id) do
Comment
|> where([c], c.origin_comment_id == ^comment_id and c.visibility in ^@public_visibility)
|> group_by([c], [c.in_reply_to_comment_id, c.id])
|> preload_for_comment()
end
@spec list_participants_for_event_query(String.t()) :: Ecto.Query.t()
defp list_participants_for_event_query(event_id) do
from(
p in Participant,
where: p.event_id == ^event_id,
preload: [:actor]
)
end
@spec list_participant_actors_for_event_query(String.t()) :: Ecto.Query.t()
defp list_participant_actors_for_event_query(event_id) do
from(
a in Actor,
join: p in Participant,
on: p.actor_id == a.id,
where: p.event_id == ^event_id
)
end
@spec list_local_emails_user_participants_for_event_query(String.t()) :: Ecto.Query.t()
def list_local_emails_user_participants_for_event_query(event_id) do
Participant
|> join(:inner, [p], a in Actor, on: p.actor_id == a.id and is_nil(a.domain))
|> join(:left, [_p, a], u in User, on: a.user_id == u.id)
|> where([p], p.event_id == ^event_id)
|> select([_p, a, u], {a, u})
end
@spec list_participations_for_user_query(integer()) :: Ecto.Query.t()
defp list_participations_for_user_query(user_id) do
from(
p in Participant,
join: e in Event,
join: a in Actor,
on: p.actor_id == a.id,
on: p.event_id == e.id,
where: a.user_id == ^user_id and p.role != ^:not_approved,
preload: [:event, :actor]
)
end
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@spec count_comments_query(integer) :: Ecto.Query.t()
defp count_comments_query(actor_id) do
from(c in Comment, select: count(c.id), where: c.actor_id == ^actor_id)
end
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@spec count_local_comments_query :: Ecto.Query.t()
defp count_local_comments_query do
from(
c in Comment,
select: count(c.id),
where: c.local == ^true and c.visibility in ^@public_visibility
)
end
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@spec feed_token_query(String.t()) :: Ecto.Query.t()
defp feed_token_query(token) do
from(ftk in FeedToken, where: ftk.token == ^token, preload: [:actor, :user])
end
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@spec feed_token_for_user_query(integer) :: Ecto.Query.t()
defp feed_token_for_user_query(user_id) do
from(tk in FeedToken, where: tk.user_id == ^user_id, preload: [:actor, :user])
end
@spec feed_token_for_actor_query(integer) :: Ecto.Query.t()
defp feed_token_for_actor_query(actor_id) do
from(tk in FeedToken, where: tk.actor_id == ^actor_id, preload: [:actor, :user])
end
@spec filter_public_visibility(Ecto.Query.t()) :: Ecto.Query.t()
defp filter_public_visibility(query) do
from(e in query, where: e.visibility in ^@public_visibility)
end
@spec filter_not_event_uuid(Ecto.Query.t(), String.t() | nil) :: Ecto.Query.t()
defp filter_not_event_uuid(query, nil), do: query
defp filter_not_event_uuid(query, not_event_uuid) do
from(e in query, where: e.uuid != ^not_event_uuid)
end
@spec filter_draft(Ecto.Query.t(), boolean) :: Ecto.Query.t()
defp filter_draft(query, is_draft \\ false) do
from(e in query, where: e.draft == ^is_draft)
end
# Currently happening events are also future events
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@spec filter_future_events(Ecto.Query.t(), boolean) :: Ecto.Query.t()
defp filter_future_events(query, true) do
from(q in query,
where: q.begins_on > ^DateTime.utc_now() or q.ends_on > ^DateTime.utc_now()
)
end
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defp filter_future_events(query, false), do: query
defp filter_local_or_from_followed_instances_events(query) do
from(q in query,
left_join: s in Share,
on: s.uri == q.url,
where: q.local == true or not is_nil(s.uri)
)
end
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@spec filter_unlisted(Ecto.Query.t(), boolean) :: Ecto.Query.t()
defp filter_unlisted(query, true) do
from(q in query, where: q.visibility in ^@public_visibility)
end
defp filter_unlisted(query, false) do
from(q in query, where: q.visibility == ^:public)
end
@spec filter_approved_role(Ecto.Query.t()) :: Ecto.Query.t()
defp filter_approved_role(query) do
filter_role(query, [:not_approved, :rejected])
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end
@spec filter_participant_role(Ecto.Query.t()) :: Ecto.Query.t()
defp filter_participant_role(query) do
filter_role(query, :participant)
end
@spec filter_rejected_role(Ecto.Query.t()) :: Ecto.Query.t()
defp filter_rejected_role(query) do
filter_role(query, :rejected)
end
@spec filter_role(Ecto.Query.t(), list(atom())) :: Ecto.Query.t()
def filter_role(query, []), do: query
def filter_role(query, roles) when is_list(roles) do
where(query, [p], p.role in ^roles)
end
def filter_role(query, role) when is_atom(role) do
from(p in query, where: p.role == ^role)
end
defp participation_filter_begins_on(query, nil, nil),
do: participation_order_begins_on_desc(query)
defp participation_filter_begins_on(query, %DateTime{} = after_datetime, nil) do
query
|> where([_p, e, _a], e.begins_on > ^after_datetime)
|> participation_order_begins_on_asc()
end
defp participation_filter_begins_on(query, nil, %DateTime{} = before_datetime) do
query
|> where([_p, e, _a], e.begins_on < ^before_datetime)
|> participation_order_begins_on_desc()
end
defp participation_order_begins_on_asc(query),
do: order_by(query, [_p, e, _a], asc: e.begins_on)
defp participation_order_begins_on_desc(query),
do: order_by(query, [_p, e, _a], desc: e.begins_on)
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@spec preload_for_event(Ecto.Query.t()) :: Ecto.Query.t()
defp preload_for_event(query), do: preload(query, ^@event_preloads)
@spec preload_for_comment(Ecto.Query.t()) :: Ecto.Query.t()
defp preload_for_comment(query), do: preload(query, ^@comment_preloads)
end