Implement Mongo.Repo.child_spec/1

To make it more convenient to add to an application's supervision tree,
similar to how Ecto.Repo-based modules are typically added to the
supervision tree.

README.md

@@ -454,12 +454,12 @@ config :my_app, MyApp.Repo,
   queue_target: 5_000
 ```
 
-Finally, we can add the `Mongo` instance to our application supervision tree:
+Finally, we can add the `Mongo.Repo` instance to our application supervision tree:
 
 ```elixir
   children = [
     # ...
-    {Mongo, MyApp.Repo.config()},
+    MyApp.Repo,
     # ...
   ]
 ```

lib/mongo/repo.ex

@@ -23,11 +23,11 @@ defmodule Mongo.Repo do
 
   For a complete list of configuration options take a look at `Mongo`.
 
-  Finally we can add the `Mongo` instance to our application supervision tree
+  Finally we can add the `Mongo.Repo` instance to our application supervision tree
 
       children = [
         # ...
-        {Mongo, MyApp.Repo.config()},
+        MyApp.Repo,
         # ...
       ]
 
@@ -60,6 +60,10 @@ defmodule Mongo.Repo do
         |> Keyword.put_new(:name, @topology)
       end
 
+      def child_spec(_opts) do
+        Mongo.child_spec(config())
+      end
+
       unless @read_only do
         def insert(%{__struct__: module} = doc, opts \\ []) do
           collection = module.__collection__(:collection)

test/mongo/repo_test.exs

@@ -17,7 +17,7 @@ defmodule Mongo.RepoTest do
   end
 
   setup do
-    assert {:ok, pid} = start_supervised({Mongo, MyRepo.config()})
+    assert {:ok, pid} = start_supervised(MyRepo)
     Mongo.drop_database(pid, nil, w: 3)
     {:ok, [pid: pid]}
   end