update gettext schema and use macros for cannery app

lib/cannery.ex

@@ -6,4 +6,34 @@ defmodule Cannery do
   Contexts are also responsible for managing your data, regardless
   if it comes from the database, an external API or others.
   """
+
+  def context do
+    quote do
+      use Gettext, backend: CanneryWeb.Gettext
+      import Ecto.Query
+      alias Cannery.Accounts.User
+      alias Cannery.Repo
+      alias Ecto.{Changeset, Multi, Queryable, UUID}
+    end
+  end
+
+  def schema do
+    quote do
+      use Ecto.Schema
+      use Gettext, backend: CanneryWeb.Gettext
+      import Ecto.{Changeset, Query}
+      alias Cannery.Accounts.User
+      alias Ecto.{Association, Changeset, Queryable, UUID}
+
+      @primary_key {:id, :binary_id, autogenerate: true}
+      @foreign_key_type :binary_id
+    end
+  end
+
+  @doc """
+  When used, dispatch to the appropriate context/schema/etc.
+  """
+  defmacro __using__(which) when is_atom(which) do
+    apply(__MODULE__, which, [])
+  end
 end