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

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Elixir
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defmodule Mobilizon.Discussions.Comment do
@moduledoc """
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Represents an actor comment (for instance on an event or on a group).
"""
use Ecto.Schema
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import Ecto.Changeset
alias Mobilizon.Actors.Actor
alias Mobilizon.Discussions.{Comment, CommentVisibility, Discussion}
alias Mobilizon.Events.{Event, Tag}
alias Mobilizon.Mention
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alias Mobilizon.Web.Endpoint
alias Mobilizon.Web.Router.Helpers, as: Routes
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@type t :: %__MODULE__{
text: String.t(),
url: String.t(),
local: boolean,
visibility: CommentVisibility.t(),
uuid: Ecto.UUID.t(),
actor: Actor.t(),
attributed_to: Actor.t(),
event: Event.t(),
tags: [Tag.t()],
mentions: [Mention.t()],
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in_reply_to_comment: t,
origin_comment: t
}
# When deleting an event we only nihilify everything
@required_attrs [:url]
@creation_required_attrs @required_attrs ++ [:text, :actor_id]
@optional_attrs [
:text,
:actor_id,
:event_id,
:in_reply_to_comment_id,
:origin_comment_id,
:attributed_to_id,
:deleted_at,
:local,
:discussion_id
]
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@attrs @required_attrs ++ @optional_attrs
schema "comments" do
field(:text, :string)
field(:url, :string)
field(:local, :boolean, default: true)
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field(:visibility, CommentVisibility, default: :public)
field(:uuid, Ecto.UUID)
field(:total_replies, :integer, virtual: true, default: 0)
field(:deleted_at, :utc_datetime)
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belongs_to(:actor, Actor, foreign_key: :actor_id)
belongs_to(:attributed_to, Actor, foreign_key: :attributed_to_id)
belongs_to(:event, Event, foreign_key: :event_id)
belongs_to(:in_reply_to_comment, Comment, foreign_key: :in_reply_to_comment_id)
belongs_to(:origin_comment, Comment, foreign_key: :origin_comment_id)
belongs_to(:discussion, Discussion, type: :binary_id)
has_many(:replies, Comment, foreign_key: :in_reply_to_comment_id)
many_to_many(:tags, Tag, join_through: "comments_tags", on_replace: :delete)
has_many(:mentions, Mention)
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timestamps(type: :utc_datetime)
end
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@doc """
Returns the id of the first comment in the discussion.
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"""
@spec get_thread_id(t) :: integer
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def get_thread_id(%__MODULE__{id: id, origin_comment_id: origin_comment_id}) do
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origin_comment_id || id
end
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@doc false
@spec changeset(t, map) :: Ecto.Changeset.t()
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def changeset(%__MODULE__{} = comment, attrs) do
comment
|> common_changeset(attrs)
|> validate_required(@creation_required_attrs)
end
def update_changeset(%__MODULE__{} = comment, attrs) do
comment
|> changeset(attrs)
# TODO handle comment edits
# |> put_change(:edits, comment.edits + 1)
end
@spec delete_changeset(t) :: Ecto.Changeset.t()
def delete_changeset(%__MODULE__{} = comment) do
comment
|> change()
|> put_change(:text, nil)
|> put_change(:actor_id, nil)
|> put_change(:discussion_id, nil)
|> put_change(:deleted_at, DateTime.utc_now() |> DateTime.truncate(:second))
end
@doc """
Checks whether an comment can be managed.
"""
@spec can_be_managed_by(t, integer | String.t()) :: boolean
def can_be_managed_by(%__MODULE__{actor_id: creator_actor_id}, actor_id)
when creator_actor_id == actor_id do
{:comment_can_be_managed, true}
end
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def can_be_managed_by(_comment, _actor), do: {:comment_can_be_managed, false}
defp common_changeset(%__MODULE__{} = comment, attrs) do
comment
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|> cast(attrs, @attrs)
|> maybe_generate_uuid()
|> maybe_generate_url()
|> put_tags(attrs)
|> put_mentions(attrs)
end
@spec maybe_generate_uuid(Ecto.Changeset.t()) :: Ecto.Changeset.t()
defp maybe_generate_uuid(%Ecto.Changeset{} = changeset) do
case fetch_field(changeset, :uuid) do
:error -> put_change(changeset, :uuid, Ecto.UUID.generate())
{:data, nil} -> put_change(changeset, :uuid, Ecto.UUID.generate())
_ -> changeset
end
end
@spec maybe_generate_url(Ecto.Changeset.t()) :: Ecto.Changeset.t()
defp maybe_generate_url(%Ecto.Changeset{} = changeset) do
with res when res in [:error, {:data, nil}] <- fetch_field(changeset, :url),
{changes, uuid} when changes in [:changes, :data] <- fetch_field(changeset, :uuid),
url <- generate_url(uuid) do
put_change(changeset, :url, url)
else
_ -> changeset
end
end
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@spec generate_url(String.t()) :: String.t()
defp generate_url(uuid), do: Routes.page_url(Endpoint, :comment, uuid)
@spec put_tags(Ecto.Changeset.t(), map) :: Ecto.Changeset.t()
defp put_tags(changeset, %{"tags" => tags}),
do: put_assoc(changeset, :tags, Enum.map(tags, &process_tag/1))
defp put_tags(changeset, %{tags: tags}),
do: put_assoc(changeset, :tags, Enum.map(tags, &process_tag/1))
defp put_tags(changeset, _), do: changeset
@spec put_mentions(Ecto.Changeset.t(), map) :: Ecto.Changeset.t()
defp put_mentions(changeset, %{"mentions" => mentions}),
do: put_assoc(changeset, :mentions, Enum.map(mentions, &process_mention/1))
defp put_mentions(changeset, %{mentions: mentions}),
do: put_assoc(changeset, :mentions, Enum.map(mentions, &process_mention/1))
defp put_mentions(changeset, _), do: changeset
# We need a changeset instead of a raw struct because of slug which is generated in changeset
defp process_tag(tag) do
Tag.changeset(%Tag{}, tag)
end
defp process_mention(tag) do
Mention.changeset(%Mention{}, tag)
end
end