app/observers/activity_observer.rb


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class ActivityObserver < BaseObserver
  observe :issue, :note, :milestone

  def after_create(record)
    event_author_id = record.author_id

    if record.kind_of?(Note)
      # Skip system status notes like 'status changed to close'
      return true if record.note.include?("_Status changed to ")

      # Skip wall notes to prevent spaming of dashboard
      return true if record.noteable_type.blank?
    end

    if event_author_id
      create_event(record, Event.determine_action(record))
    end
  end

  def after_close(record, transition)
    create_event(record, Event::CLOSED)
  end

  def after_reopen(record, transition)
    create_event(record, Event::REOPENED)
  end

  protected

  def create_event(record, status)
    Event.create(
        project: record.project,
        target_id: record.id,
        target_type: record.class.name,
        action: status,
        author_id: record.author_id
    )
  end
end