Add queries for finding opponents

lib/chess/repo/queries.ex

@@ -5,6 +5,7 @@ defmodule Chess.Repo.Queries do
 
   alias Chess.Repo
   alias Chess.Store.Game
+  alias Chess.Store.User
 
   def game_for_info(user_id, game_id) do
     user_id
@@ -19,4 +20,10 @@ defmodule Chess.Repo.Queries do
     |> preload(:moves)
     |> Repo.get!(game_id)
   end
+
+  def opponents(user, query_string) do
+    user
+    |> User.opponents
+    |> User.matches(query_string)
+  end
 end

lib/chess/store/user.ex

@@ -46,16 +46,21 @@ defmodule Chess.Store.User do
     |> hash_password()
   end
 
-  def unique_validations(struct, params \\ %{}) do
+  def unique_validations(struct) do
     struct
     |> unique_constraint(:name)
     |> unique_constraint(:email)
   end
 
   def opponents(user) do
-    from user in "users",
-      where: user.id != ^user.id,
-      select: {user.name, user.id}
+    from user in __MODULE__,
+      where: user.id != ^user.id
+  end
+
+  def matches(query, query_string) do
+    from user in query,
+      where: ilike(user.name, ^"%#{query_string}%")
+             or user.email == ^query_string
   end
 
   defp hash_password(changeset) do

test/chess/repo/queries_test.exs

@@ -0,0 +1,69 @@
+defmodule Chess.Repo.QueriesTest do
+  use Chess.DataCase
+
+  import Chess.Factory
+  alias Chess.Repo
+  alias Chess.Repo.Queries
+
+  describe "opponents" do
+    test "it finds a user on a partial name match" do
+      user = insert(:user, %{
+        name: "Link",
+        email: "link@hyrule.com",
+        password: "ilovezelda"
+      })
+      opponent = insert(:user, %{
+        name: "Princess Zelda",
+        email: "zelda@hyrule.com",
+        password: "ganonsucks"
+      })
+
+      result =
+        user
+        |> Queries.opponents("zelda")
+        |> Repo.one
+
+      assert result.id == opponent.id
+    end
+
+    test "it finds a user on a complete email match" do
+      user = insert(:user, %{
+        name: "Link",
+        email: "link@hyrule.com",
+        password: "ilovezelda"
+      })
+      opponent = insert(:user, %{
+        name: "Princess Zelda",
+        email: "zelda@hyrule.com",
+        password: "ganonsucks"
+      })
+
+      result =
+        user
+        |> Queries.opponents("zelda@hyrule.com")
+        |> Repo.one
+
+      assert result.id == opponent.id
+    end
+
+    test "it does not find a user on a partial email" do
+      user = insert(:user, %{
+        name: "Link",
+        email: "link@hyrule.com",
+        password: "ilovezelda"
+      })
+      insert(:user, %{
+        name: "Princess Zelda",
+        email: "zelda@hyrule.com",
+        password: "ganonsucks"
+      })
+
+      result =
+        user
+        |> Queries.opponents("hyrule")
+        |> Repo.one
+
+      assert result == nil
+    end
+  end
+end