feat(chat): add messages

lib/slax/chat/message.ex

@@ -0,0 +1,22 @@
+defmodule Slax.Chat.Message do
+  use Ecto.Schema
+  import Ecto.Changeset
+  alias Slax.Chat.Room
+  alias Slax.Accounts.User
+
+  schema "messages" do
+    field :body, :string
+
+    belongs_to :user, User
+    belongs_to :room, Room
+
+    timestamps(type: :utc_datetime)
+  end
+
+  @doc false
+  def changeset(message, attrs) do
+    message
+    |> cast(attrs, [:user_id, :room_id, :body])
+    |> validate_required([:user_id, :room_id, :body])
+  end
+end

lib/slax/chat/room.ex

@@ -1,11 +1,14 @@
 defmodule Slax.Chat.Room do
   use Ecto.Schema
   import Ecto.Changeset
+  alias Slax.Chat.Message
 
   schema "rooms" do
     field :name, :string
     field :topic, :string
 
+    has_many :messages, Message
+
     timestamps(type: :utc_datetime)
   end