430 lines
12 KiB
Elixir
430 lines
12 KiB
Elixir
defmodule Mobilizon.Discussions do
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@moduledoc """
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The discussions context
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"""
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import EctoEnum
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import Ecto.Query
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alias Ecto.Changeset
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alias Ecto.Multi
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alias Mobilizon.Actors.Actor
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alias Mobilizon.Discussions.{Comment, Discussion}
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alias Mobilizon.Storage.{Page, Repo}
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defenum(
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CommentVisibility,
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:comment_visibility,
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[
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:public,
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:unlisted,
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:private,
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:moderated,
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:invite
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]
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)
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defenum(
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CommentModeration,
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:comment_moderation,
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[
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:allow_all,
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:moderated,
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:closed
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]
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)
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@comment_preloads [
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:actor,
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:event,
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:attributed_to,
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:in_reply_to_comment,
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:origin_comment,
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:replies,
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:tags,
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:mentions,
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:discussion
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]
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@discussion_preloads [
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:last_comment,
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:comments,
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:creator,
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:actor
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]
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@public_visibility [:public, :unlisted]
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def data do
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Dataloader.Ecto.new(Repo, query: &query/2)
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end
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@doc """
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Query for comment dataloader
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We only get first comment of thread, and count replies.
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Read: https://hexdocs.pm/absinthe/ecto.html#dataloader
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"""
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def query(Comment, _params) do
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Comment
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|> join(:left, [c], r in Comment, on: r.origin_comment_id == c.id)
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|> where([c, _], is_nil(c.in_reply_to_comment_id))
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# TODO: This was added because we don't want to count deleted comments in total_replies.
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# However, it also excludes all top-level comments with deleted replies from being selected
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# |> where([_, r], is_nil(r.deleted_at))
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|> group_by([c], c.id)
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|> select([c, r], %{c | total_replies: count(r.id)})
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end
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def query(queryable, _) do
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queryable
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end
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@doc """
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Gets a single comment.
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"""
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@spec get_comment(integer | String.t()) :: Comment.t() | nil
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def get_comment(nil), do: nil
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def get_comment(id), do: Repo.get(Comment, id)
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@doc """
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Gets a single comment.
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Raises `Ecto.NoResultsError` if the comment does not exist.
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"""
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@spec get_comment!(integer | String.t()) :: Comment.t()
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def get_comment!(id), do: Repo.get!(Comment, id)
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@spec get_comment_with_preload(String.t() | integer() | nil) :: Comment.t() | nil
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def get_comment_with_preload(nil), do: nil
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def get_comment_with_preload(id) do
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Comment
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|> where(id: ^id)
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|> preload_for_comment()
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|> Repo.one()
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end
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@doc """
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Gets a comment by its URL.
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"""
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@spec get_comment_from_url(String.t()) :: Comment.t() | nil
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def get_comment_from_url(url), do: Repo.get_by(Comment, url: url)
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@doc """
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Gets a comment by its URL.
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Raises `Ecto.NoResultsError` if the comment does not exist.
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"""
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@spec get_comment_from_url!(String.t()) :: Comment.t()
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def get_comment_from_url!(url), do: Repo.get_by!(Comment, url: url)
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@doc """
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Gets a comment by its URL, with all associations loaded.
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"""
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@spec get_comment_from_url_with_preload(String.t()) ::
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{:ok, Comment.t()} | {:error, :comment_not_found}
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def get_comment_from_url_with_preload(url) do
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query = from(c in Comment, where: c.url == ^url)
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comment =
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query
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|> preload_for_comment()
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|> Repo.one()
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case comment do
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%Comment{} = comment ->
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{:ok, comment}
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nil ->
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{:error, :comment_not_found}
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end
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end
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@doc """
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Gets a comment by its URL, with all associations loaded.
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Raises `Ecto.NoResultsError` if the comment does not exist.
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"""
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@spec get_comment_from_url_with_preload(String.t()) :: Comment.t()
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def get_comment_from_url_with_preload!(url) do
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Comment
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|> Repo.get_by!(url: url)
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|> Repo.preload(@comment_preloads)
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end
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@doc """
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Gets a comment by its UUID, with all associations loaded.
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"""
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@spec get_comment_from_uuid_with_preload(String.t()) :: Comment.t()
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def get_comment_from_uuid_with_preload(uuid) do
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Comment
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|> Repo.get_by(uuid: uuid)
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|> Repo.preload(@comment_preloads)
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end
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def get_threads(event_id) do
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Comment
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|> where([c, _], c.event_id == ^event_id and is_nil(c.origin_comment_id))
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|> join(:left, [c], r in Comment, on: r.origin_comment_id == c.id)
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|> group_by([c], c.id)
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|> select([c, r], %{c | total_replies: count(r.id)})
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|> Repo.all()
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end
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@doc """
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Gets paginated replies for root comment
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"""
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@spec get_thread_replies(integer()) :: [Comment.t()]
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def get_thread_replies(parent_id) do
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parent_id
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|> public_replies_for_thread_query()
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|> Repo.all()
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end
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def get_or_create_comment(%{"url" => url} = attrs) do
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case Repo.get_by(Comment, url: url) do
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%Comment{} = comment -> {:ok, Repo.preload(comment, @comment_preloads)}
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nil -> create_comment(attrs)
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end
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end
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@doc """
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Creates a comment.
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"""
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@spec create_comment(map) :: {:ok, Comment.t()} | {:error, Changeset.t()}
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def create_comment(attrs \\ %{}) do
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with {:ok, %Comment{} = comment} <-
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%Comment{}
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|> Comment.changeset(attrs)
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|> Repo.insert(),
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%Comment{} = comment <- Repo.preload(comment, @comment_preloads) do
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{:ok, comment}
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end
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end
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@doc """
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Updates a comment.
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"""
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@spec update_comment(Comment.t(), map) :: {:ok, Comment.t()} | {:error, Changeset.t()}
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def update_comment(%Comment{} = comment, attrs) do
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comment
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|> Comment.update_changeset(attrs)
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|> Repo.update()
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end
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@doc """
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Deletes a comment
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But actually just empty the fields so that threads are not broken.
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"""
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@spec delete_comment(Comment.t(), Keyword.t()) :: {:ok, Comment.t()} | {:error, Changeset.t()}
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def delete_comment(%Comment{} = comment, options \\ []) do
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if Keyword.get(options, :force, false) == false do
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with {:ok, %Comment{} = comment} <-
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comment
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|> Comment.delete_changeset()
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|> Repo.update(),
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%Comment{} = comment <- get_comment_with_preload(comment.id) do
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{:ok, comment}
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end
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else
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comment
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|> Repo.delete()
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end
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end
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@doc """
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Returns the list of public comments.
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"""
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@spec list_comments :: [Comment.t()]
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def list_comments do
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Repo.all(from(c in Comment, where: c.visibility == ^:public))
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end
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@spec list_local_comments(integer | nil, integer | nil) :: Page.t()
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def list_local_comments(page \\ nil, limit \\ nil) do
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Comment
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|> where([c], c.visibility == ^:public)
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|> where([c], is_nil(c.deleted_at))
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|> where([c], is_nil(c.discussion_id))
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|> preload_for_comment()
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|> Page.build_page(page, limit)
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end
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@doc """
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Returns the list of public comments for the actor.
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"""
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@spec list_public_comments_for_actor(Actor.t(), integer | nil, integer | nil) :: Page.t()
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def list_public_comments_for_actor(%Actor{id: actor_id}, page \\ nil, limit \\ nil) do
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actor_id
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|> public_comments_for_actor_query()
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|> Page.build_page(page, limit)
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end
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@doc """
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Returns the list of comments by an actor and a list of ids.
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"""
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@spec list_comments_by_actor_and_ids(integer | String.t(), [integer | String.t()]) ::
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[Comment.t()]
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def list_comments_by_actor_and_ids(actor_id, comment_ids \\ [])
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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
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Comment
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|> where([c], c.id in ^comment_ids)
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|> where([c], c.actor_id == ^actor_id)
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|> Repo.all()
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end
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@spec get_comments_for_discussion(integer, integer | nil, integer | nil) :: Page.t()
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def get_comments_for_discussion(discussion_id, page \\ nil, limit \\ nil) do
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Comment
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|> where([c], c.discussion_id == ^discussion_id)
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|> order_by(asc: :inserted_at)
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|> Page.build_page(page, limit)
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end
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@doc """
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Counts local comments.
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"""
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@spec count_local_comments :: integer
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def count_local_comments, do: Repo.one(count_local_comments_query())
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def get_discussion(discussion_id) do
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Discussion
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|> Repo.get(discussion_id)
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|> Repo.preload(@discussion_preloads)
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end
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@spec get_discussion_by_url(String.t() | nil) :: Discussion.t() | nil
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def get_discussion_by_url(nil), do: nil
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def get_discussion_by_url(discussion_url) do
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Discussion
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|> Repo.get_by(url: discussion_url)
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|> Repo.preload(@discussion_preloads)
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end
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def get_discussion_by_slug(discussion_slug) do
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Discussion
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|> Repo.get_by(slug: discussion_slug)
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|> Repo.preload(@discussion_preloads)
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end
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@spec find_discussions_for_actor(Actor.t(), integer | nil, integer | nil) :: Page.t()
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def find_discussions_for_actor(%Actor{id: actor_id}, page \\ nil, limit \\ nil) do
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Discussion
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|> where([c], c.actor_id == ^actor_id)
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|> preload(^@discussion_preloads)
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|> order_by(desc: :updated_at)
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|> Page.build_page(page, limit)
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end
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@doc """
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Creates a discussion.
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"""
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@spec create_discussion(map) :: {:ok, Comment.t()} | {:error, Changeset.t()}
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def create_discussion(attrs \\ %{}) do
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with {:ok, %{comment: %Comment{} = _comment, discussion: %Discussion{} = discussion}} <-
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Multi.new()
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|> Multi.insert(
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:comment,
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Comment.changeset(
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%Comment{},
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Map.merge(attrs, %{actor_id: attrs.creator_id, attributed_to_id: attrs.actor_id})
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)
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)
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|> Multi.insert(:discussion, fn %{comment: %Comment{id: comment_id}} ->
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Discussion.changeset(
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%Discussion{},
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Map.merge(attrs, %{last_comment_id: comment_id})
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)
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end)
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|> Multi.update(:comment_discussion, fn %{
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comment: %Comment{} = comment,
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discussion: %Discussion{
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id: discussion_id,
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url: discussion_url
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}
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} ->
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Changeset.change(comment, %{discussion_id: discussion_id, url: discussion_url})
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end)
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|> Repo.transaction() do
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{:ok, discussion}
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end
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end
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def reply_to_discussion(%Discussion{id: discussion_id} = discussion, attrs \\ %{}) do
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with {:ok, %{comment: %Comment{} = comment, discussion: %Discussion{} = discussion}} <-
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Multi.new()
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|> Multi.insert(
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:comment,
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Comment.changeset(
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%Comment{},
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Map.merge(attrs, %{
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discussion_id: discussion_id,
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actor_id: Map.get(attrs, :creator_id, attrs.actor_id)
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})
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)
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)
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|> Multi.update(:discussion, fn %{comment: %Comment{id: comment_id}} ->
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Discussion.changeset(
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discussion,
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%{last_comment_id: comment_id}
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)
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end)
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|> Repo.transaction() do
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# Discussion is not updated
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{:ok, Map.put(discussion, :last_comment, comment)}
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end
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end
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@doc """
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Update a discussion. Only their title for now.
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"""
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@spec update_discussion(Discussion.t(), map()) ::
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{:ok, Discussion.t()} | {:error, Changeset.t()}
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def update_discussion(%Discussion{} = discussion, attrs \\ %{}) do
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discussion
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|> Discussion.changeset(attrs)
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|> Repo.update()
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end
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@doc """
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Delete a discussion.
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"""
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@spec delete_discussion(Discussion.t()) :: {:ok, Discussion.t()} | {:error, Changeset.t()}
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def delete_discussion(%Discussion{id: discussion_id}) do
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Multi.new()
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|> Multi.delete_all(:comments, fn _ ->
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where(Comment, [c], c.discussion_id == ^discussion_id)
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end)
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# |> Multi.delete(:discussion, discussion)
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|> Repo.transaction()
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end
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defp public_comments_for_actor_query(actor_id) do
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Comment
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|> where([c], c.actor_id == ^actor_id and c.visibility in ^@public_visibility)
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|> order_by([c], desc: :id)
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|> preload_for_comment()
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end
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defp public_replies_for_thread_query(comment_id) do
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Comment
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|> where([c], c.origin_comment_id == ^comment_id and c.visibility in ^@public_visibility)
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|> group_by([c], [c.in_reply_to_comment_id, c.id])
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|> preload_for_comment()
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end
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@spec count_local_comments_query :: Ecto.Query.t()
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defp count_local_comments_query do
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from(
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c in Comment,
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select: count(c.id),
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where: c.local == ^true and c.visibility in ^@public_visibility
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)
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end
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@spec preload_for_comment(Ecto.Query.t()) :: Ecto.Query.t()
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defp preload_for_comment(query), do: preload(query, ^@comment_preloads)
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end
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