AR方法到JSON

Question

我有一个模特

class Store
    has_many :opening_times
    #returns ActiveRecordRelation

我有一个JSON API，可以调用类似

的内容

Store.first.opening_times.to_json

有没有办法让这个方法自定义？

当然我知道我可以创建一个类似“opening_times_to_json”的方法并在我的json模板中调用它，但是也许有一种很好的Ruby或Rails方法，方法可以响应不同的格式？

修改

我想要那样

我现在就做了：

def opening_times_as_json
  #opening_times.map{|o| {o.weekday.to_sym=>"#{o.open} - #{o.close}"}}
  { :monday=>"#{opening_times[0].open} - #{opening_times[0].close}", 
    :tuesday=>"#{opening_times[1].open} - #{opening_times[1].close}",
    :wednesday=>"#{opening_times[2].open} - #{opening_times[2].close}",
    :thursday=>"#{opening_times[3].open} - #{opening_times[3].close}",
    :friday=>"#{opening_times[4].open} - #{opening_times[4].close}",
    :satturday=>"#{opening_times[5].open} - #{opening_times[5].close}",
    :sunday=>"#{opening_times[6].open} - #{opening_times[6].close}" }
end

这就是我想要的结果：

是否有更优雅的方式来实现这一目标？

opening_time model has weekday as string, open as integer and close as integer

编辑2作为请求opening_time模型

class Advertisement::OpeningTime < ActiveRecord::Base
  attr_accessible :weekday, :open, :close  
  belongs_to :advertisement
end

和广告

class Advertisement < ActiveRecord::Base
    has_many :opening_times
    def initialize(*params)super(*params)
    if (@new_record)
      %w(monday tuesday wednesday thursday firday saturday sunday).each do |weekday|
        self.opening_times.build weekday: weekday
      end      
    end
  end

Answer 1

我认为，您可以覆盖as_json模型的OpeningTime方法。这是article on as_json vs to_json。 Quote：“as_json用于创建JSON的结构作为哈希，并将该哈希呈现为JSON字符串留给ActiveSupport :: json.encode。你永远不应该使用to_json创建一个表示，只有消耗表示。“

所以，你会做类似的事情：

class OpeningTime

  def as_json(options)
    super(:only => [:attributes_you_want], :methods => [:description_markdown])
  end

end

<强>更新

您是否尝试过在控制器中关注：

类StoreOpeningTimes＆lt; ApplicationController中

 def index
   @store = Store.find(params[:id])
   render json: @store.opening_times
 end

端

希望，这有帮助。

Answer 2

我可能会推荐这样的东西：

DAYS_OF_THE_WEEK = [
  "Monday",
  "Tuesday",
  "Wednesday",
  "Thursday",
  "Friday",
  "Saturday",
  "Sunday"
]

# I might recommend renaming #opening_times_as_json to #hours
def hours
  DAYS_OF_THE_WEEK.map { |day| :day.to_sym => hours_for_day(day) }
end

def hours_for_day(day)
  "#{opening_times[index_for_day(day)].open} - #{opening_times[index_for_day(day)].close}"
end

def index_for_day(day)
  DAYS_OF_THE_WEEK.index(day_of_week_name)
end