Fix IssueObserver current_user assign. Refactored observers

app/observers/activity_observer.rb

@@ -0,0 +1,25 @@
+class ActivityObserver < ActiveRecord::Observer
+  observe :issue, :merge_request
+
+  def after_create(record)
+    Event.create(
+      :project => record.project,
+      :target_id => record.id,
+      :target_type => record.class.name,
+      :action => Event.determine_action(record),
+      :author_id => record.author_id
+    )
+  end
+
+  def after_save(record)
+    if record.changed.include?("closed") 
+      Event.create(
+        :project => record.project,
+        :target_id => record.id,
+        :target_type => record.class.name,
+        :action => (record.closed ? Event::Closed : Event::Reopened),
+        :author_id => record.author_id_of_changes
+      )
+    end
+  end
+end