From a7b1ecf20408e40992c752a02de6abfc1594e0f2 Mon Sep 17 00:00:00 2001
From: "byte[]" <byteslice@airmail.cc>
Date: Fri, 23 Oct 2020 00:34:14 -0400
Subject: [PATCH] peform alias resolution in user links (fixes
 philomena-dev/philomena#52)

---
 lib/philomena/user_links.ex | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/lib/philomena/user_links.ex b/lib/philomena/user_links.ex
index cd71402e..3e2ae7b8 100644
--- a/lib/philomena/user_links.ex
+++ b/lib/philomena/user_links.ex
@@ -54,7 +54,7 @@ defmodule Philomena.UserLinks do
 
   """
   def create_user_link(user, attrs \\ %{}) do
-    tag = Repo.get_by(Tag, name: attrs["tag_name"])
+    tag = fetch_tag(attrs["tag_name"])
 
     %UserLink{}
     |> UserLink.creation_changeset(attrs, user, tag)
@@ -74,7 +74,7 @@ defmodule Philomena.UserLinks do
 
   """
   def update_user_link(%UserLink{} = user_link, attrs) do
-    tag = Repo.get_by(Tag, name: attrs["tag_name"])
+    tag = fetch_tag(attrs["tag_name"])
 
     user_link
     |> UserLink.edit_changeset(attrs, tag)
@@ -159,4 +159,15 @@ defmodule Philomena.UserLinks do
       nil
     end
   end
+
+  defp fetch_tag(name) do
+    Tag
+    |> preload(:aliased_tag)
+    |> where(name: ^name)
+    |> Repo.one()
+    |> case do
+      nil -> nil
+      tag -> tag.aliased_tag || tag
+    end
+  end
 end