fix adding the same tag twice

lib/chiya/tags/tag_updater.ex

@@ -70,7 +70,10 @@ defmodule Chiya.Tags.TagUpdater do
   end
 
   defp add_tags(note, tags) do
-    Enum.each(tags, &add_tag(note, &1))
+    tags
+    |> Enum.uniq()
+    |> Enum.each(&add_tag(note, &1))
+
     note
   end
 
@@ -102,7 +105,10 @@ defmodule Chiya.Tags.TagUpdater do
   end
 
   defp remove_tags(note, tags) do
-    Enum.each(tags, &remove_tag(note, &1))
+    tags
+    |> Enum.uniq()
+    |> Enum.each(&remove_tag(note, &1))
+
     note
   end
 

test/chiya/tag_updater_test.exs

@@ -53,5 +53,14 @@ defmodule Chiya.TagUpdaterTest do
       tag = List.first(note.tags)
       assert tag.name == "foo"
     end
+
+    test "with the same tag twice only adds unique tags" do
+      note = note_fixture()
+      assert note.tags == []
+
+      TagUpdater.update_tags(note, "foo,foo")
+      note = Chiya.Notes.get_note_preloaded!(note.id)
+      assert Enum.count(note.tags) == 1
+    end
   end
 end