Rails的模型as_json覆蓋默認值

Question

我想對JSON覆蓋默認模型值，而是重寫它創建重複的哈希

我的模型：

class HomeScreenButton < ActiveRecord::Base 
    belongs_to :product_category  
    validates :product_category_id, :x, :y, :presence => true 
    attr_accessible :product_category_id, :x, :y 

    def as_json(options={}) 
    hash = super(options) 
    hash.merge({ 
     :product_category_id => "fdfd" 
    }) 
    end 
end 

我的控制器：

def index 
    @home_screen_buttons = HomeScreenButton.all 

    respond_to do |format| 
     format.html # index.html.erb 
     format.json { render json: @home_screen_buttons} 
    end 
end 

當我打開json時，它顯示我爲product_category_id的副本：[{"created_at":"2013-03-17T11:14:32Z","id":1,"product_category_id":5,"updated_at":"2013-03-17T11:14:32Z","x":300,"y":200,"product_category_id":"dfdffff"}]

Answer 1

有沒有需要合併哈希

def as_json(options={}) 
    hash = super(options) 
    hash[:product_category_id] = "fdfd" 
    hash 
end