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

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defmodule Mobilizon.Actors do
@moduledoc """
The Actors context.
"""
import Ecto.Query, warn: false
import Mobilizon.Ecto
alias Mobilizon.Repo
alias Mobilizon.Actors.{Actor, Bot, Member, Follower}
alias Mobilizon.Media.File
alias Ecto.Multi
alias Mobilizon.Service.ActivityPub
require Logger
@doc false
def data() do
Dataloader.Ecto.new(Repo, query: &query/2)
end
@doc false
def query(queryable, _params) do
queryable
end
@doc """
Returns the list of actors.
## Examples
iex> Mobilizon.Actors.list_actors()
[%Mobilizon.Actors.Actor{}]
"""
@spec list_actors() :: list()
def list_actors do
Repo.all(Actor)
end
@doc """
Gets a single actor.
Raises `Ecto.NoResultsError` if the Actor does not exist.
## Examples
iex> get_actor!(123)
%Mobilizon.Actors.Actor{}
iex> get_actor!(456)
** (Ecto.NoResultsError)
"""
@spec get_actor!(integer()) :: Actor.t()
def get_actor!(id) do
Repo.get!(Actor, id)
end
# Get actor by ID and preload organized events, followers and followings
@spec get_actor_with_everything(integer()) :: Ecto.Query.t()
defp do_get_actor_with_everything(id) do
from(a in Actor,
where: a.id == ^id,
preload: [:organized_events, :followers, :followings]
)
end
@doc """
Returns an actor with every relation
"""
@spec get_actor_with_everything(integer()) :: Mobilizon.Actors.Actor.t()
def get_actor_with_everything(id) do
id
|> do_get_actor_with_everything
|> Repo.one()
end
@doc """
Returns an actor with every relation
"""
@spec get_local_actor_with_everything(integer()) :: Mobilizon.Actors.Actor.t()
def get_local_actor_with_everything(id) do
id
|> do_get_actor_with_everything
|> where([a], is_nil(a.domain))
|> Repo.one()
end
@doc """
Creates a actor.
## Examples
iex> create_actor(%{preferred_username: "test"})
{:ok, %Mobilizon.Actors.Actor{preferred_username: "test"}}
iex> create_actor(%{preferred_username: nil})
{:error, %Ecto.Changeset{}}
"""
def create_actor(attrs \\ %{}) do
%Actor{}
|> Actor.changeset(attrs)
|> Repo.insert()
end
@doc """
Updates a actor.
## Examples
iex> update_actor(%Actor{preferred_username: "toto"}, %{preferred_username: "tata"})
{:ok, %Mobilizon.Actors.Actor{preferred_username: "tata"}}
iex> update_actor(%Actor{preferred_username: "toto"}, %{preferred_username: nil})
{:error, %Ecto.Changeset{}}
"""
def update_actor(%Actor{} = actor, attrs) do
actor
|> Actor.changeset(attrs)
|> delete_files_if_media_changed()
|> Repo.update()
end
defp delete_files_if_media_changed(%Ecto.Changeset{changes: changes} = changeset) do
Enum.each([:avatar, :banner], fn key ->
if Map.has_key?(changes, key) do
with %Ecto.Changeset{changes: %{url: new_url}} <- changes[key],
old_url <- Map.from_struct(changeset.data) |> Map.get(key) |> Map.get(:url),
false <- new_url == old_url do
MobilizonWeb.Upload.remove(old_url)
end
end
end)
changeset
end
@doc """
Deletes a Actor.
## Examples
iex> delete_actor(%Actor{})
{:ok, %Mobilizon.Actors.Actor{}}
iex> delete_actor(nil)
{:error, %Ecto.Changeset{}}
"""
@spec delete_actor(Actor.t()) :: {:ok, Actor.t()} | {:error, Ecto.Changeset.t()}
def delete_actor(%Actor{domain: nil} = actor) do
case Multi.new()
|> Multi.delete(:actor, actor)
|> Multi.run(:remove_banner, fn _repo,
%{actor: %Actor{banner: %File{url: url}}} = _picture ->
MobilizonWeb.Upload.remove(url)
end)
|> Multi.run(:remove_avatar, fn _repo,
%{actor: %Actor{avatar: %File{url: url}}} = _picture ->
MobilizonWeb.Upload.remove(url)
end)
|> Repo.transaction() do
{:ok, %{actor: %Actor{} = actor}} ->
{:ok, actor}
{:error, remove, error, _} when remove in [:remove_banner, :remove_avatar] ->
{:error, error}
end
end
def delete_actor(%Actor{} = actor) do
Repo.delete(actor)
end
@doc """
Returns an `%Ecto.Changeset{}` for tracking actor changes.
## Examples
iex> change_actor(%Actor{})
%Ecto.Changeset{data: %Mobilizon.Actors.Actor{}}
"""
@spec change_actor(Actor.t()) :: Ecto.Changeset.t()
def change_actor(%Actor{} = actor) do
Actor.changeset(actor, %{})
end
@doc """
List the groups
"""
@spec list_groups(number(), number()) :: list(Actor.t())
def list_groups(page \\ nil, limit \\ nil) do
Repo.all(
from(
a in Actor,
where: a.type == ^:Group,
where: a.visibility in [^:public, ^:unlisted]
)
|> paginate(page, limit)
)
end
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@doc """
Get the default member role depending on the actor openness
"""
@spec get_default_member_role(Actor.t()) :: atom()
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def get_default_member_role(%Actor{openness: :open}), do: :member
def get_default_member_role(%Actor{}), do: :not_approved
@doc """
Get a group by it's title
"""
@spec get_group_by_title(String.t()) :: Actor.t() | nil
def get_group_by_title(title) do
case String.split(title, "@") do
[title] ->
get_local_group_by_title(title)
[title, domain] ->
Repo.one(
from(a in Actor,
where: a.preferred_username == ^title and a.type == "Group" and a.domain == ^domain
)
)
end
end
@doc """
Get a local group by it's title
"""
@spec get_local_group_by_title(String.t()) :: Actor.t() | nil
def get_local_group_by_title(title) do
title
|> do_get_local_group_by_title
|> Repo.one()
end
@spec do_get_local_group_by_title(String.t()) :: Ecto.Query.t()
defp do_get_local_group_by_title(title) do
from(a in Actor,
where: a.preferred_username == ^title and a.type == "Group" and is_nil(a.domain)
)
end
@doc """
Creates a group.
## Examples
iex> create_group(%{name: "group name"})
{:ok, %Mobilizon.Actors.Actor{}}
iex> create_group(%{name: nil})
{:error, %Ecto.Changeset{}}
"""
def create_group(attrs \\ %{}) do
%Actor{}
|> Actor.group_creation(attrs)
|> Repo.insert()
end
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@doc """
Delete a group
"""
def delete_group!(%Actor{type: :Group} = group) do
Repo.delete!(group)
end
@doc """
Upsert an actor.
Conflicts on actor's URL/AP ID. Replaces keys, avatar and banner, name and summary.
"""
@spec insert_or_update_actor(map(), boolean()) :: {:ok, Actor.t()}
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def insert_or_update_actor(data, preload \\ false) do
cs =
data
|> Actor.remote_actor_creation()
with {:ok, actor} <-
Repo.insert(
cs,
on_conflict: [
set: [
keys: data.keys,
name: data.name,
summary: data.summary
]
],
conflict_target: [:url]
) do
actor = if preload, do: Repo.preload(actor, [:followers]), else: actor
{:ok, actor}
else
err ->
Logger.error(inspect(err))
{:error, err}
end
end
# def increase_event_count(%Actor{} = actor) do
# event_count = (actor.info["event_count"] || 0) + 1
# new_info = Map.put(actor.info, "note_count", note_count)
#
# cs = info_changeset(actor, %{info: new_info})
#
# update_and_set_cache(cs)
# end
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@doc """
Get an actor by it's URL (ActivityPub ID). The `:preload` option allows preloading the Followers relation.
Raises `Ecto.NoResultsError` if the Actor does not exist.
## Examples
iex> get_actor_by_url("https://mastodon.server.tld/users/user")
{:ok, %Mobilizon.Actors.Actor{preferred_username: "user"}}
iex> get_actor_by_url("https://mastodon.server.tld/users/user", true)
{:ok, %Mobilizon.Actors.Actor{preferred_username: "user", followers: []}}
iex> get_actor_by_url("non existent")
{:error, :actor_not_found}
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"""
@spec get_actor_by_url(String.t(), boolean()) :: {:ok, Actor.t()} | {:error, :actor_not_found}
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def get_actor_by_url(url, preload \\ false) do
case Repo.get_by(Actor, url: url) do
nil ->
{:error, :actor_not_found}
actor ->
actor = if preload, do: Repo.preload(actor, [:followers]), else: actor
{:ok, actor}
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end
end
@doc """
Get an actor by it's URL (ActivityPub ID). The `:preload` option allows preloading the Followers relation.
Raises `Ecto.NoResultsError` if the Actor does not exist.
## Examples
iex> get_actor_by_url!("https://mastodon.server.tld/users/user")
%Mobilizon.Actors.Actor{}
iex> get_actor_by_url!("https://mastodon.server.tld/users/user", true)
{:ok, %Mobilizon.Actors.Actor{preferred_username: "user", followers: []}}
iex> get_actor_by_url!("non existent")
** (Ecto.NoResultsError)
"""
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@spec get_actor_by_url!(String.t(), boolean()) :: struct()
def get_actor_by_url!(url, preload \\ false) do
actor = Repo.get_by!(Actor, url: url)
if preload, do: Repo.preload(actor, [:followers]), else: actor
end
@doc """
Get an actor by name
## Examples
iex> get_actor_by_name("tcit")
%Mobilizon.Actors.Actor{preferred_username: "tcit", domain: nil}
iex> get_actor_by_name("tcit@social.tcit.fr")
%Mobilizon.Actors.Actor{preferred_username: "tcit", domain: "social.tcit.fr"}
iex> get_actor_by_name("tcit", :Group)
nil
"""
@spec get_actor_by_name(String.t(), atom() | nil) :: Actor.t()
def get_actor_by_name(name, type \\ nil) do
# Base query
query = from(a in Actor)
# If we have Person / Group information
query =
if type in [:Person, :Group] do
from(a in query, where: a.type == ^type)
else
query
end
# If the name is a remote actor
query =
case String.split(name, "@") do
[name] -> do_get_actor_by_name(query, name)
[name, domain] -> do_get_actor_by_name(query, name, domain)
end
Repo.one(query)
end
# Get actor by username and domain is nil
@spec do_get_actor_by_name(Ecto.Queryable.t(), String.t()) :: Ecto.Queryable.t()
defp do_get_actor_by_name(query, name) do
from(a in query, where: a.preferred_username == ^name and is_nil(a.domain))
end
# Get actor by username and domain
@spec do_get_actor_by_name(Ecto.Queryable.t(), String.t(), String.t()) :: Ecto.Queryable.t()
defp do_get_actor_by_name(query, name, domain) do
from(a in query, where: a.preferred_username == ^name and a.domain == ^domain)
end
@doc """
Return a local actor by it's preferred username
"""
@spec get_local_actor_by_name(String.t()) :: Actor.t() | nil
def get_local_actor_by_name(name) do
Repo.one(
from(a in Actor,
where: a.preferred_username == ^name and is_nil(a.domain)
)
)
end
@doc """
Return a local actor by it's preferred username and preload associations
Preloads organized_events, followers and followings
"""
@spec get_local_actor_by_name_with_everything(String.t()) :: Actor.t() | nil
def get_local_actor_by_name_with_everything(name) do
actor = Repo.one(from(a in Actor, where: a.preferred_username == ^name and is_nil(a.domain)))
Repo.preload(actor, [:organized_events, :followers, :followings])
end
@doc """
Returns actor by name and preloads the organized events
## Examples
iex> get_actor_by_name_with_everything("tcit")
%Mobilizon.Actors.Actor{preferred_username: "tcit", domain: nil, organized_events: []}
iex> get_actor_by_name_with_everything("tcit@social.tcit.fr")
%Mobilizon.Actors.Actor{preferred_username: "tcit", domain: "social.tcit.fr", organized_events: []}
iex> get_actor_by_name_with_everything("tcit", :Group)
nil
"""
@spec get_actor_by_name_with_everything(String.t(), atom() | nil) :: Actor.t()
def get_actor_by_name_with_everything(name, type \\ nil) do
name
|> get_actor_by_name(type)
|> Repo.preload(:organized_events)
end
@doc """
Returns a cached local actor by username
"""
@spec get_cached_local_actor_by_name(String.t()) ::
{:ok, Actor.t()} | {:commit, Actor.t()} | {:ignore, any()}
def get_cached_local_actor_by_name(name) do
Cachex.fetch(:activity_pub, "actor_" <> name, fn "actor_" <> name ->
case get_local_actor_by_name(name) do
nil -> {:ignore, nil}
%Actor{} = actor -> {:commit, actor}
end
end)
end
@doc """
Getting an actor from url, eventually creating it
"""
# TODO: Move this to Mobilizon.Service.ActivityPub
@spec get_or_fetch_by_url(String.t(), bool()) :: {:ok, Actor.t()} | {:error, String.t()}
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def get_or_fetch_by_url(url, preload \\ false) do
with {:ok, actor} <- get_actor_by_url(url, preload) do
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{:ok, actor}
else
_ ->
case ActivityPub.make_actor_from_url(url, preload) do
{:ok, actor} ->
{:ok, actor}
_ ->
Logger.error("Could not fetch by AP id")
{:error, "Could not fetch by AP id"}
end
end
end
@doc """
Getting an actor from url, eventually creating it
Returns an error if fetch failed
"""
# TODO: Move this to Mobilizon.Service.ActivityPub
@spec get_or_fetch_by_url!(String.t(), bool()) :: Actor.t()
def get_or_fetch_by_url!(url, preload \\ false) do
with {:ok, actor} <- get_actor_by_url(url, preload) do
actor
else
_ ->
case ActivityPub.make_actor_from_url(url, preload) do
{:ok, actor} ->
actor
_ ->
raise "Could not fetch by AP id"
end
end
end
@doc """
Find local users by their username
"""
# TODO: This doesn't seem to be used anyway
@spec find_local_by_username(String.t()) :: list(Actor.t())
def find_local_by_username(username) do
actors =
Repo.all(
from(
a in Actor,
where:
fragment(
"f_unaccent(?) <% f_unaccent(?) or
f_unaccent(coalesce(?, '')) <% f_unaccent(?)",
a.preferred_username,
^username,
a.name,
^username
),
where: is_nil(a.domain),
order_by:
fragment(
"word_similarity(?, ?) + word_similarity(coalesce(?, ''), ?) desc",
a.preferred_username,
^username,
a.name,
^username
)
)
)
Repo.preload(actors, :organized_events)
end
@doc """
Find actors by their name or displayed name
"""
@spec find_and_count_actors_by_username_or_name(
String.t(),
[ActorTypeEnum.t()],
integer() | nil,
integer() | nil
) ::
%{total: integer(), elements: list(Actor.t())}
def find_and_count_actors_by_username_or_name(username, _types, page \\ nil, limit \\ nil)
def find_and_count_actors_by_username_or_name(username, types, page, limit) do
query =
from(
a in Actor,
where:
fragment(
"f_unaccent(?) %> f_unaccent(?) or
f_unaccent(coalesce(?, '')) %> f_unaccent(?)",
a.preferred_username,
^username,
a.name,
^username
),
where: a.type in ^types,
order_by:
fragment(
"word_similarity(?, ?) + word_similarity(coalesce(?, ''), ?) desc",
a.preferred_username,
^username,
a.name,
^username
)
)
|> paginate(page, limit)
total = Task.async(fn -> Repo.aggregate(query, :count, :id) end)
elements = Task.async(fn -> Repo.all(query) end)
%{total: Task.await(total), elements: Task.await(elements)}
end
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@doc """
Get a group by its actor id
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"""
def get_group_by_actor_id(actor_id) do
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case Repo.get_by(Actor, id: actor_id, type: :Group) do
nil -> {:error, :group_not_found}
actor -> {:ok, actor}
end
end
@doc """
Create a new RSA key
"""
@spec create_keys() :: String.t()
def create_keys() do
key = :public_key.generate_key({:rsa, 2048, 65_537})
entry = :public_key.pem_entry_encode(:RSAPrivateKey, key)
[entry] |> :public_key.pem_encode() |> String.trim_trailing()
end
@doc """
Create a new person actor
"""
@spec new_person(map()) :: {:ok, Actor.t()} | any
def new_person(args) do
key = :public_key.generate_key({:rsa, 2048, 65_537})
entry = :public_key.pem_entry_encode(:RSAPrivateKey, key)
pem = [entry] |> :public_key.pem_encode() |> String.trim_trailing()
args = Map.put(args, :keys, pem)
with {:ok, %Actor{} = person} <-
%Actor{}
|> Actor.registration_changeset(args)
|> Repo.insert() do
Mobilizon.Events.create_feed_token(%{"user_id" => args["user_id"], "actor_id" => person.id})
{:ok, person}
end
end
@doc """
Register a new bot actor.
"""
@spec register_bot_account(map()) :: Actor.t()
def register_bot_account(%{name: name, summary: summary}) do
key = :public_key.generate_key({:rsa, 2048, 65_537})
entry = :public_key.pem_entry_encode(:RSAPrivateKey, key)
pem = [entry] |> :public_key.pem_encode() |> String.trim_trailing()
actor =
Mobilizon.Actors.Actor.registration_changeset(%Mobilizon.Actors.Actor{}, %{
preferred_username: name,
domain: nil,
keys: pem,
summary: summary,
type: :Service
})
try do
Mobilizon.Repo.insert!(actor)
rescue
e in Ecto.InvalidChangesetError ->
{:error, e.changeset}
end
end
alias Mobilizon.Actors.Member
@doc """
Gets a single member.
Raises `Ecto.NoResultsError` if the Member does not exist.
## Examples
iex> get_member!(123)
%Mobilizon.Actors.Member{}
iex> get_member!(456)
** (Ecto.NoResultsError)
"""
def get_member!(id), do: Repo.get!(Member, id)
@doc """
Creates a member.
## Examples
iex> create_member(%{actor: %Actor{}})
{:ok, %Mobilizon.Actors.Member{}}
iex> create_member(%{actor: nil})
{:error, %Ecto.Changeset{}}
"""
def create_member(attrs \\ %{}) do
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with {:ok, %Member{} = member} <-
%Member{}
|> Member.changeset(attrs)
|> Repo.insert() do
{:ok, Repo.preload(member, [:actor, :parent])}
end
end
@doc """
Updates a member.
## Examples
iex> update_member(%Member{}, %{role: 3})
{:ok, %Mobilizon.Actors.Member{}}
iex> update_member(%Member{}, %{role: nil})
{:error, %Ecto.Changeset{}}
"""
def update_member(%Member{} = member, attrs) do
member
|> Member.changeset(attrs)
|> Repo.update()
end
@doc """
Deletes a Member.
## Examples
iex> delete_member(%Member{})
{:ok, %Mobilizon.Actors.Member{}}
iex> delete_member(%Member{})
{:error, %Ecto.Changeset{}}
"""
def delete_member(%Member{} = member) do
Repo.delete(member)
end
@doc """
Returns an `%Ecto.Changeset{}` for tracking member changes.
## Examples
iex> change_member(%Member{})
%Ecto.Changeset{data: %Mobilizon.Actors.Member{}}
"""
def change_member(%Member{} = member) do
Member.changeset(member, %{})
end
@doc """
Returns the memberships for an actor
"""
@spec groups_memberships_for_actor(Actor.t()) :: list(Member.t())
def groups_memberships_for_actor(%Actor{id: id} = _actor) do
Repo.all(
from(
m in Member,
where: m.actor_id == ^id,
preload: [:parent]
)
)
end
@doc """
Returns the memberships for a group
"""
@spec memberships_for_group(Actor.t()) :: list(Member.t())
def memberships_for_group(%Actor{type: :Group, id: id} = _group) do
Repo.all(
from(
m in Member,
where: m.parent_id == ^id,
preload: [:parent, :actor]
)
)
end
alias Mobilizon.Actors.Bot
@doc """
Returns the list of bots.
## Examples
iex> list_bots()
[%Mobilizon.Actors.Bot{}]
"""
def list_bots do
Repo.all(Bot)
end
@doc """
Gets a single bot.
Raises `Ecto.NoResultsError` if the Bot does not exist.
## Examples
iex> get_bot!(123)
%Mobilizon.Actors.Bot{}
iex> get_bot!(456)
** (Ecto.NoResultsError)
"""
def get_bot!(id), do: Repo.get!(Bot, id)
@doc """
Get the bot associated to an actor
"""
@spec get_bot_by_actor(Actor.t()) :: Bot.t()
def get_bot_by_actor(%Actor{} = actor) do
Repo.get_by!(Bot, actor_id: actor.id)
end
@doc """
Creates a bot.
## Examples
iex> create_bot(%{source: "toto"})
{:ok, %Mobilizon.Actors.Bot{}}
iex> create_bot(%{source: nil})
{:error, %Ecto.Changeset{}}
"""
def create_bot(attrs \\ %{}) do
%Bot{}
|> Bot.changeset(attrs)
|> Repo.insert()
end
@doc """
Updates a bot.
## Examples
iex> update_bot(%Bot{}, %{source: "new"})
{:ok, %Mobilizon.Actors.Bot{}}
iex> update_bot(%Bot{}, %{source: nil})
{:error, %Ecto.Changeset{}}
"""
def update_bot(%Bot{} = bot, attrs) do
bot
|> Bot.changeset(attrs)
|> Repo.update()
end
@doc """
Deletes a Bot.
## Examples
iex> delete_bot(%Bot{})
{:ok, %Mobilizon.Actors.Bot{}}
iex> delete_bot(%Bot{})
{:error, %Ecto.Changeset{}}
"""
def delete_bot(%Bot{} = bot) do
Repo.delete(bot)
end
@doc """
Returns an `%Ecto.Changeset{}` for tracking bot changes.
## Examples
iex> change_bot(%Bot{})
%Ecto.Changeset{data: %Mobilizon.Actors.Bot{}}
"""
def change_bot(%Bot{} = bot) do
Bot.changeset(bot, %{})
end
alias Mobilizon.Actors.Follower
@doc """
Gets a single follower.
Raises `Ecto.NoResultsError` if the Follower does not exist.
## Examples
iex> get_follower!(123)
%Mobilizon.Actors.Follower{}
iex> get_follower!(456)
** (Ecto.NoResultsError)
"""
def get_follower!(id) do
Repo.get!(Follower, id)
|> Repo.preload([:actor, :target_actor])
end
@doc """
Get a follower by the followed actor and following actor
"""
@spec get_follower(Actor.t(), Actor.t()) :: Follower.t()
def get_follower(%Actor{id: followed_id}, %Actor{id: follower_id}) do
Repo.one(
from(f in Follower, where: f.target_actor_id == ^followed_id and f.actor_id == ^follower_id)
)
end
@doc """
Creates a follower.
## Examples
iex> create_follower(%{actor: %Actor{}})
{:ok, %Mobilizon.Actors.Follower{}}
iex> create_follower(%{actor: nil})
{:error, %Ecto.Changeset{}}
"""
def create_follower(attrs \\ %{}) do
with {:ok, %Follower{} = follower} <-
%Follower{}
|> Follower.changeset(attrs)
|> Repo.insert() do
{:ok, Repo.preload(follower, [:actor, :target_actor])}
end
end
@doc """
Updates a follower.
## Examples
iex> update_follower(Follower{}, %{approved: true})
{:ok, %Mobilizon.Actors.Follower{}}
iex> update_follower(Follower{}, %{approved: nil})
{:error, %Ecto.Changeset{}}
"""
def update_follower(%Follower{} = follower, attrs) do
follower
|> Follower.changeset(attrs)
|> Repo.update()
end
@doc """
Deletes a Follower.
## Examples
iex> delete_follower(Follower{})
{:ok, %Mobilizon.Actors.Follower{}}
iex> delete_follower(Follower{})
{:error, %Ecto.Changeset{}}
"""
def delete_follower(%Follower{} = follower) do
Repo.delete(follower)
end
@doc """
Delete a follower by followed and follower actors
## Examples
iex> delete_follower(%Actor{}, %Actor{})
{:ok, %Mobilizon.Actors.Follower{}}
iex> delete_follower(%Actor{}, %Actor{})
{:error, %Ecto.Changeset{}}
"""
@spec delete_follower(Actor.t(), Actor.t()) ::
{:ok, Follower.t()} | {:error, Ecto.Changeset.t()}
def delete_follower(%Actor{} = followed, %Actor{} = follower) do
get_follower(followed, follower) |> Repo.delete()
end
@doc """
Returns an `%Ecto.Changeset{}` for tracking follower changes.
## Examples
iex> change_follower(Follower{})
%Ecto.Changeset{data: %Mobilizon.Actors.Follower{}}
"""
def change_follower(%Follower{} = follower) do
Follower.changeset(follower, %{})
end
end