From 44aef2183e0f44dbb8619ad3438e80cca67fb5cb Mon Sep 17 00:00:00 2001
From: Roger Braun <roger@rogerbraun.net>
Date: Thu, 20 Jul 2017 19:37:41 +0200
Subject: [PATCH] Add follower / friend fetching to user.

---
 lib/pleroma/user.ex | 17 +++++++++++++++++
 test/user_test.exs  | 30 ++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/lib/pleroma/user.ex b/lib/pleroma/user.ex
index af0e569a4..d5befa67b 100644
--- a/lib/pleroma/user.ex
+++ b/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
diff --git a/test/user_test.exs b/test/user_test.exs
index 0f42e9b51..81827afa3 100644
--- a/test/user_test.exs
+++ b/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