Add follower / friend fetching to user.

lib/pleroma/user.ex

@@ -186,4 +186,21 @@ def get_or_fetch_by_nickname(nickname) do
       end
     end
   end
+
+  # TODO: these queries could be more efficient if the type in postgresql wasn't map, but array.
+  def get_followers(%User{id: id, follower_address: follower_address}) do
+    q = from u in User,
+      where: fragment("? @> ?", u.following, ^follower_address ),
+      where: u.id != ^id
+
+    {:ok, Repo.all(q)}
+  end
+
+  def get_friends(%User{id: id, following: following}) do
+    q = from u in User,
+      where: u.follower_address in ^following,
+      where: u.id != ^id
+
+    {:ok, Repo.all(q)}
+  end
 end

test/user_test.exs

@@ -197,5 +197,35 @@ test "it restricts some sizes" do
       end)
     end
   end
+
+  describe "followers and friends" do
+    test "gets all followers for a given user" do
+      user = insert(:user)
+      follower_one = insert(:user)
+      follower_two = insert(:user)
+      not_follower = insert(:user)
+
+      {:ok, follower_one} = User.follow(follower_one, user)
+      {:ok, follower_two} = User.follow(follower_two, user)
+
+      {:ok, res} = User.get_followers(user)
+
+      assert res == [follower_one, follower_two]
+    end
+
+    test "gets all friends (followed users) for a given user" do
+      user = insert(:user)
+      followed_one = insert(:user)
+      followed_two = insert(:user)
+      not_followed = insert(:user)
+
+      {:ok, user} = User.follow(user, followed_one)
+      {:ok, user} = User.follow(user, followed_two)
+
+      {:ok, res} = User.get_friends(user)
+
+      assert res == [followed_one, followed_two]
+    end
+  end
 end