Show opponent on game screen

lib/chess_web/controllers/game_controller.ex

@@ -42,7 +42,10 @@ defmodule ChessWeb.GameController do
   end
 
   def show(conn, %{"id" => id}) do
-    game = Repo.get!(Game, id)
+    query = from(game in Game, preload: [:user, :opponent])
+    game =
+      query
+      |> Repo.get!(id)
 
     render(conn, "show.html", game: game)
   end

lib/chess_web/templates/game/show.html.eex

@@ -1,3 +1,5 @@
+<h2>Game with <%= opponent(@conn, @game).username %></h2>
+
 <p><%= link "Back to games", to: game_path(@conn, :index) %></p>
 
 <div id="app" data-game-id="<%= @game.id %>">

test/features/games_test.exs

@@ -22,6 +22,7 @@ defmodule Chess.GamesTest do
     |> click(button("Create game"))
 
     session
+    |> assert_has(css("h2", text: "Game with zelda"))
     |> assert_has(css(".board"))
   end
 
@@ -56,6 +57,12 @@ defmodule Chess.GamesTest do
     session
     |> assert_has(css(".table tr", count: 1))
     |> assert_has(link("Game with zelda"))
+
+    session
+    |> click(link("Game with zelda"))
+
+    session
+    |> assert_has(css("h2", text: "Game with zelda"))
   end
 
   test "can move a piece", %{session: session} do