app/observers/users_project_observer.rb


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class UsersProjectObserver < ActiveRecord::Observer
  def after_commit(users_project)
    return if users_project.destroyed?
    Notify.delay.project_access_granted_email(users_project.id)
  end

  def after_create(users_project)
    Event.create(
      project_id: users_project.project.id,
      action: Event::JOINED,
      author_id: users_project.user.id
    )
  end

  def after_destroy(users_project)
    Event.create(
      project_id: users_project.project.id,
      action: Event::LEFT,
      author_id: users_project.user.id
    )
  end
end