ruby-on-rails - Rails 渲染 json 包括带参数的方法

Question

我在方法 Controller 中有这个渲染:

render :json => @boats, :include => {:port => {:only => [:id, :name], :include => {:city => {:only => [:id, :name], :methods => :translatedCity}}}}

但是 translatedCity模型中的方法应该接受语言参数。

  def translatedCity     
    language = params[:language]
    puts "translatedCity.language=" + language  
    city = TranslationService.translateCity(self.city_id, language)        
    return city.element_translation
  end

我在 Controller 中有参数。有没有办法把这个参数传递给模型中的方法？

Answer 1

不幸的是，传递需要参数的方法的过程to_json没有很好地内置到 rails 中。一个典型的模式是修改as_json模型上的方法接受自定义键，然后调用 to_json (或 render :json)

# city.rb model
def translatedCity(language)
  puts "translatedCity.language=" + language  
  city = TranslationService.translateCity(self.city_id, language)        
  return city.element_translation
end

def as_json(options = {})
  json_to_return = super
  if options.has_key? :translatedCity
    city_translation = self.translatedCity(options[:translatedCity][:language])
    json_to_return[:translatedCity] = city_translation
  end

  return json_to_return
end

现在在您的 Controller 中，您可以相应地传递所有内容

render :json => @boats, 
  :include => {
    :port => {
      :only => [:id, :name], 
      :include => {
        :city => {
          :only => [:id, :name], 
          :translatedCity => params[:language]
        }
      }
    }
  }