ruby-on-rails -/未定义方法 `page_media'中的NoMethodError为nil :NilClass

Question

NoMethodError位于/
nil:NilClass的未定义方法`page_media'

indexapp/controllers/homepage_controller.rb

  before_action :set_track_page_status
  def index
     @cms_page     = Page.find_by_content_filename("homepage.en.yml")
     @homepage_cms = HomepageCms.first
     @page_medium  = @cms_page.page_media.order("id ASC")
     @roots        = Category.roots
  end
end

如何在Ror上解决此问题？主页未加载。

Answer 1

只需稍作修改:

@page_medium  = @cms_page.page_media.order("id ASC") if @cms_page.page_media