Refactor controllers a bit

lib/chess/board.ex

@@ -1,7 +1,7 @@
 defmodule Chess.Board do
   @moduledoc false
 
-  def output(board) do
+  def transform(board) do
     Enum.map(0..7, fn (rank) ->
       Enum.map(0..7, fn (file) ->
         board["#{file},#{rank}"]

lib/chess_web/controllers/api/game_controller.ex

@@ -2,6 +2,7 @@ defmodule ChessWeb.Api.GameController do
   use ChessWeb, :controller
 
   alias Chess.Store.Game
+  alias Chess.Board
 
   import Chess.Auth, only: [current_user: 1]
 
@@ -12,7 +13,8 @@ defmodule ChessWeb.Api.GameController do
       |> Game.for_user()
       |> Repo.get!(id)
 
-    render(conn, "show.json", game: game)
+    conn
+    |> json(Board.transform(game.board))
   end
 
   def update(conn, %{"id" => id, "move" => move_params}) do
@@ -28,7 +30,8 @@ defmodule ChessWeb.Api.GameController do
 
     case Repo.update(changeset) do
       {:ok, game} ->
-        render(conn, "show.json", game: game)
+        conn
+        |> json(Board.transform(game.board))
     end
   end
 

lib/chess_web/controllers/game_controller.ex

@@ -15,7 +15,8 @@ defmodule ChessWeb.GameController do
       |> preload([:user, :opponent])
       |> Repo.all
 
-    render(conn, "index.html", games: games, changeset: changeset)
+    conn
+    |> render("index.html", games: games, changeset: changeset)
   end
 
   def new(conn, _params) do
@@ -25,7 +26,8 @@ defmodule ChessWeb.GameController do
       |> current_user()
       |> get_opponents()
 
-    render(conn, "new.html", changeset: changeset, opponents: opponents)
+    conn
+    |> render("new.html", changeset: changeset, opponents: opponents)
   end
 
   def create(conn, %{"game" => %{"opponent_id" => opponent_id}}) do
@@ -42,9 +44,11 @@ defmodule ChessWeb.GameController do
         conn
         |> put_flash(:info, "Game created successfully.")
         |> redirect(to: game_path(conn, :show, game))
+
       {:error, changeset} ->
         opponents = get_opponents(current_user(conn))
-        render(conn, "new.html", changeset: changeset, opponents: opponents)
+        conn
+        |> render("new.html", changeset: changeset, opponents: opponents)
     end
   end
 
@@ -58,7 +62,8 @@ defmodule ChessWeb.GameController do
       query
       |> Repo.get!(id)
 
-    render(conn, "show.html", game: game)
+    conn
+    |> render("show.html", game: game)
   end
 
   def delete(conn, %{"id" => id}) do

lib/chess_web/views/api/game_view.ex

@@ -1,9 +1,3 @@
 defmodule ChessWeb.Api.GameView do
   use ChessWeb, :view
-
-  alias Chess.Board
-
-  def render("show.json", %{game: game}) do
-    Board.output(game.board)
-  end
 end