Fix IssueObserver current_user assign. Refactored observers

app/observers/key_observer.rb

@@ -0,0 +1,9 @@
+class KeyObserver < ActiveRecord::Observer
+  def after_save(key)
+    key.update_repository
+  end
+
+  def after_destroy(key)
+    key.repository_delete_key
+  end
+end