callback_controller.rb

  def create_very_rails
    project = Project.create project_params

    if project.persisted?
      sync_new project
      redirect_to project
    else
      redirect_to edit_project_path(project)
    end
  end
  
  def create_rails
    project = portfolio.add_project project_params

    if project.persisted?
      sync_new project
      redirect_to project
    else
      redirect_to edit_project_path(project)
    end
  end
  
  def create_respond_with
    portfolio.subscribe ProjectSync.new(self)
    self.project = portfolio.add_project(project_params)

    respond_with project
  end

  def create_on
    portfolio.on :project_added do |project|
      sync_new project
      redirect_to project
    end

    portfolio.on :project_add_failed do |project|
      redirect_to edit_project_path(project)
    end

    portfolio.add_project project_params
  end

  def create_on_block
    portfolio.add_project project_params do |on|
      on.project_added do |project|
        sync_new project
        redirect_to project
      end

      on.project_add_failed do |project|
        redirect_to edit_project_path(project)
      end
    end
  end

  def create_subscribe
    portfolio.subscribe self, on: %i[project_added project_add_failed]
    portfolio.add_project project_params
  end

  def project_added(project: nil, portfolio: nil)
    sync_new project
    redirect_to project
  end

  def project_add_failed(project: nil, portfolio: nil)
    redirect_to edit_project_path(project)
  end

I use something similar to create_on, but I also like create_on_block since it puts the code in sequential order. Is it possible to call sync_new within an object other than a controller?