Refactoring of Events context

lib/mobilizon/events/session.ex

@@ -1,10 +1,41 @@
 defmodule Mobilizon.Events.Session do
   @moduledoc """
-  Represents a session for an event (such as a talk at a conference)
+  Represents a session for an event (such as a talk at a conference).
   """
+
   use Ecto.Schema
+
   import Ecto.Changeset
-  alias Mobilizon.Events.{Session, Event, Track}
+
+  alias Mobilizon.Events.{Event, Session, Track}
+
+  @type t :: %__MODULE__{
+          audios_urls: String.t(),
+          language: String.t(),
+          long_abstract: String.t(),
+          short_abstract: String.t(),
+          slides_url: String.t(),
+          subtitle: String.t(),
+          title: String.t(),
+          videos_urls: String.t(),
+          begins_on: DateTime.t(),
+          ends_on: DateTime.t(),
+          event: Event.t(),
+          track: Track.t()
+        }
+
+  @required_attrs [
+    :title,
+    :subtitle,
+    :short_abstract,
+    :long_abstract,
+    :language,
+    :slides_url,
+    :videos_urls,
+    :audios_urls
+  ]
+  @optional_attrs [:event_id, :track_id]
+  @attrs @required_attrs ++ @optional_attrs
 
   schema "sessions" do
     field(:audios_urls, :string)
@@ -17,6 +48,7 @@ defmodule Mobilizon.Events.Session do
     field(:videos_urls, :string)
     field(:begins_on, :utc_datetime)
     field(:ends_on, :utc_datetime)
+
     belongs_to(:event, Event)
     belongs_to(:track, Track)
 
@@ -24,29 +56,10 @@ defmodule Mobilizon.Events.Session do
   end
 
   @doc false
+  @spec changeset(t, map) :: Ecto.Changeset.t()
   def changeset(%Session{} = session, attrs) do
     session
-    |> cast(attrs, [
-      :title,
-      :subtitle,
-      :short_abstract,
-      :long_abstract,
-      :language,
-      :slides_url,
-      :videos_urls,
-      :audios_urls,
-      :event_id,
-      :track_id
-    ])
-    |> validate_required([
-      :title,
-      :subtitle,
-      :short_abstract,
-      :long_abstract,
-      :language,
-      :slides_url,
-      :videos_urls,
-      :audios_urls
-    ])
+    |> cast(attrs, @attrs)
+    |> validate_required(@required_attrs)
   end
 end