debianize-mobilizon/lib/mobilizon/discussions/discussions.ex

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defmodule Mobilizon.Discussions do
@moduledoc """
The discussions context
"""
import EctoEnum
import Ecto.Query
alias Ecto.Changeset
alias Ecto.Multi
alias Mobilizon.Actors.Actor
alias Mobilizon.Discussions.{Comment, Discussion}
alias Mobilizon.Storage.{Page, Repo}
defenum(
CommentVisibility,
:comment_visibility,
[
:public,
:unlisted,
:private,
:moderated,
:invite
]
)
defenum(
CommentModeration,
:comment_moderation,
[
:allow_all,
:moderated,
:closed
]
)
@comment_preloads [
:actor,
:event,
:attributed_to,
:in_reply_to_comment,
:origin_comment,
:replies,
:tags,
:mentions,
:discussion
]
@discussion_preloads [
:last_comment,
:comments,
:creator,
:actor
]
@public_visibility [:public, :unlisted]
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))
# TODO: This was added because we don't want to count deleted comments in total_replies.
# However, it also excludes all top-level comments with deleted replies from being selected
# |> 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() | nil
def get_comment(nil), do: nil
def get_comment(id), do: Repo.get(Comment, id)
@doc """
Gets a single comment.
Raises `Ecto.NoResultsError` if the comment does not exist.
"""
@spec get_comment!(integer | String.t()) :: Comment.t()
def get_comment!(id), do: Repo.get!(Comment, id)
@spec get_comment_with_preload(String.t() | integer() | nil) :: Comment.t() | nil
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
@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)
@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)
@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)
comment =
query
|> preload_for_comment()
|> Repo.one()
case comment do
%Comment{} = comment ->
{:ok, comment}
nil ->
{:error, :comment_not_found}
end
end
@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
@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)
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(),
%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.update_changeset(attrs)
|> Repo.update()
end
@doc """
Deletes a comment
But actually just empty the fields so that threads are not broken.
"""
@spec delete_comment(Comment.t(), Keyword.t()) :: {:ok, Comment.t()} | {:error, Changeset.t()}
def delete_comment(%Comment{} = comment, options \\ []) do
if Keyword.get(options, :force, false) == false do
with {:ok, %Comment{} = comment} <-
comment
|> Comment.delete_changeset()
|> Repo.update(),
%Comment{} = comment <- get_comment_with_preload(comment.id) do
{:ok, comment}
end
else
comment
|> Repo.delete()
end
end
@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
@spec list_local_comments(integer | nil, integer | nil) :: Page.t()
def list_local_comments(page \\ nil, limit \\ nil) do
Comment
|> where([c], c.visibility == ^:public)
|> where([c], is_nil(c.deleted_at))
|> where([c], is_nil(c.discussion_id))
|> preload_for_comment()
|> Page.build_page(page, limit)
end
@doc """
Returns the list of public comments for the actor.
"""
@spec list_public_comments_for_actor(Actor.t(), integer | nil, integer | nil) :: Page.t()
def list_public_comments_for_actor(%Actor{id: actor_id}, page \\ nil, limit \\ nil) do
actor_id
|> public_comments_for_actor_query()
|> Page.build_page(page, limit)
end
@doc """
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: []
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
@spec get_comments_for_discussion(integer, integer | nil, integer | nil) :: Page.t()
def get_comments_for_discussion(discussion_id, page \\ nil, limit \\ nil) do
Comment
|> where([c], c.discussion_id == ^discussion_id)
|> order_by(asc: :inserted_at)
|> Page.build_page(page, limit)
end
@doc """
Counts local comments under events
"""
@spec count_local_comments_under_events :: integer
def count_local_comments_under_events do
count_local_comments_query()
|> filter_comments_under_events()
|> Repo.one()
end
@doc """
Counts all comments.
"""
@spec count_comments_under_events :: integer
def count_comments_under_events do
count_comments_query()
|> filter_comments_under_events()
|> Repo.one()
end
def get_discussion(discussion_id) do
Discussion
|> Repo.get(discussion_id)
|> Repo.preload(@discussion_preloads)
end
@spec get_discussion_by_url(String.t() | nil) :: Discussion.t() | nil
def get_discussion_by_url(nil), do: nil
def get_discussion_by_url(discussion_url) do
Discussion
|> Repo.get_by(url: discussion_url)
|> Repo.preload(@discussion_preloads)
end
def get_discussion_by_slug(discussion_slug) do
Discussion
|> Repo.get_by(slug: discussion_slug)
|> Repo.preload(@discussion_preloads)
end
@spec find_discussions_for_actor(Actor.t(), integer | nil, integer | nil) :: Page.t()
def find_discussions_for_actor(%Actor{id: actor_id}, page \\ nil, limit \\ nil) do
Discussion
|> where([c], c.actor_id == ^actor_id)
|> preload(^@discussion_preloads)
|> order_by(desc: :updated_at)
|> Page.build_page(page, limit)
end
@doc """
Creates a discussion.
"""
@spec create_discussion(map) :: {:ok, Comment.t()} | {:error, Changeset.t()}
def create_discussion(attrs \\ %{}) do
with {:ok, %{comment: %Comment{} = _comment, discussion: %Discussion{} = discussion}} <-
Multi.new()
|> Multi.insert(
:comment,
Comment.changeset(
%Comment{},
Map.merge(attrs, %{actor_id: attrs.creator_id, attributed_to_id: attrs.actor_id})
)
)
|> Multi.insert(:discussion, fn %{comment: %Comment{id: comment_id}} ->
Discussion.changeset(
%Discussion{},
Map.merge(attrs, %{last_comment_id: comment_id})
)
end)
|> Multi.update(:comment_discussion, fn %{
comment: %Comment{} = comment,
discussion: %Discussion{
id: discussion_id,
url: discussion_url
}
} ->
Changeset.change(comment, %{discussion_id: discussion_id, url: discussion_url})
end)
|> Repo.transaction() do
{:ok, discussion}
end
end
def reply_to_discussion(%Discussion{id: discussion_id} = discussion, attrs \\ %{}) do
with {:ok, %{comment: %Comment{} = comment, discussion: %Discussion{} = discussion}} <-
Multi.new()
|> Multi.insert(
:comment,
Comment.changeset(
%Comment{},
Map.merge(attrs, %{
discussion_id: discussion_id,
actor_id: Map.get(attrs, :creator_id, attrs.actor_id)
})
)
)
|> Multi.update(:discussion, fn %{comment: %Comment{id: comment_id}} ->
Discussion.changeset(
discussion,
%{last_comment_id: comment_id}
)
end)
|> Repo.transaction() do
# Discussion is not updated
{:ok, Map.put(discussion, :last_comment, comment)}
end
end
@doc """
Update a discussion. Only their title for now.
"""
@spec update_discussion(Discussion.t(), map()) ::
{:ok, Discussion.t()} | {:error, Changeset.t()}
def update_discussion(%Discussion{} = discussion, attrs \\ %{}) do
discussion
|> Discussion.changeset(attrs)
|> Repo.update()
end
@doc """
Delete a discussion.
"""
@spec delete_discussion(Discussion.t()) :: {:ok, Discussion.t()} | {:error, Changeset.t()}
def delete_discussion(%Discussion{id: discussion_id}) do
Multi.new()
|> Multi.delete_all(:comments, fn _ ->
where(Comment, [c], c.discussion_id == ^discussion_id)
end)
# |> Multi.delete(:discussion, discussion)
|> Repo.transaction()
end
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 count_local_comments_query :: Ecto.Query.t()
defp count_local_comments_query do
count_comments_query()
|> where([c], local: true)
end
@spec count_comments_query :: Ecto.Query.t()
defp count_comments_query do
from(
c in Comment,
select: count(c.id),
where: c.visibility in ^@public_visibility
)
end
defp filter_comments_under_events(query) do
where(query, [c], is_nil(c.discussion_id) and not is_nil(c.event_id))
end
@spec preload_for_comment(Ecto.Query.t()) :: Ecto.Query.t()
defp preload_for_comment(query), do: preload(query, ^@comment_preloads)
end