Refactoring of Actors context

lib/mobilizon/actors/bot.ex

@@ -1,15 +1,30 @@
 defmodule Mobilizon.Actors.Bot do
   @moduledoc """
-  Represents a local bot
+  Represents a local bot.
   """
+
   use Ecto.Schema
+
   import Ecto.Changeset
+
   alias Mobilizon.Actors.Actor
   alias Mobilizon.Users.User
 
+  @type t :: %__MODULE__{
+          source: String.t(),
+          type: String.t(),
+          actor: Actor.t(),
+          user: User.t()
+        }
+
+  @required_attrs [:source]
+  @optional_attrs [:type, :actor_id, :user_id]
+  @attrs @required_attrs ++ @optional_attrs
+
   schema "bots" do
     field(:source, :string)
     field(:type, :string, default: :ics)
+
     belongs_to(:actor, Actor)
     belongs_to(:user, User)
 
@@ -17,9 +32,10 @@ defmodule Mobilizon.Actors.Bot do
   end
 
   @doc false
+  @spec changeset(t | Ecto.Changeset.t(), map) :: Ecto.Changeset.t()
   def changeset(bot, attrs) do
     bot
-    |> cast(attrs, [:source, :type, :actor_id, :user_id])
-    |> validate_required([:source])
+    |> cast(attrs, @attrs)
+    |> validate_required(@required_attrs)
   end
 end