Use UUIDs as primary keys instead of sequential integers (#359)

Author: Guillaume Cauchon

config/config.exs

@@ -12,7 +12,10 @@ config :elixir_boilerplate, ElixirBoilerplateWeb.Endpoint,
   pubsub_server: ElixirBoilerplate.PubSub,
   render_errors: [view: ElixirBoilerplateWeb.Errors, accepts: ~w(html json)]
 
-config :elixir_boilerplate, ElixirBoilerplate.Repo, start_apps_before_migration: [:ssl]
+config :elixir_boilerplate, ElixirBoilerplate.Repo,
+  migration_primary_key: [type: :binary_id, default: {:fragment, "gen_random_uuid()"}],
+  migration_timestamps: [type: :utc_datetime_usec],
+  start_apps_before_migration: [:ssl]
 
 config :elixir_boilerplate, Corsica, allow_headers: :all
 

lib/elixir_boilerplate/schema.ex

@@ -0,0 +1,15 @@
+defmodule ElixirBoilerplate.Schema do
+  defmacro __using__(_) do
+    quote do
+      use Ecto.Schema
+
+      import Ecto.Changeset
+
+      alias Ecto.{Schema, UUID}
+
+      @primary_key {:id, :binary_id, autogenerate: true}
+      @foreign_key_type :binary_id
+      @timestamps_opts [type: :utc_datetime_usec]
+    end
+  end
+end