Question

原谅我模糊的话题，我目前正在开发一个有三个模型用户，列表和项目的rails应用程序。用户有许多列表，列表可以有很多项。我目前正在开发一种方法，显示用户拥有的列表数量，我需要列表才能给出其中的项目数。我相信有一种解析这些数据的方法，而不必在列表模型中创建列项。原谅我，因为我是新手，我确信有一个非常简单的方法。下面是我的方法的语法，以及类列表和项目。提前致谢。（我只是想在列表数据中解析每个列表中的项目数量）

def showLists
     pageSize = 10
     pageNum = 1
     if (params[:limit])
       pageSize = (params[:limit])
       pageSize = pageSize.to_i
     end
     pageNum= (params[:page]) 
     pageNum = pageNum.to_i   
     @key = PrivateKey.find(1)
     @key = @key.key     
     if (params[:apiKey]) == @key 
      @user = User.find_by_facebookexternalId(params[:id])
      if @user.access_key.key == (params[:accessToken])         
         y =(pageSize*pageNum)
         x =(y-pageSize) 
         @list = @user.lists 
         total= @list.count
         @list = @list.all(:select=>[:name,:id,:listtype,:description ], :include=>[:items=>@list[x].items.count])    
         @list = @list[x .. y] 
         #listResponse={:name=>@list.name}        
         response = {:total =>total,:page => pageNum, :limit=> pageSize, :userId=> @user.id, :accessToken=> @user.access_key.key , :list=>@list } 
         #response = {:lists => @list}
         respond_to do |format|
           format.json {render :json  => response}
         end
      end        
     end
   end

架构信息

# == Schema Information
#
# Table name: lists
#
#  id          :integer          not null, primary key
#  name        :string(255)
#  active      :boolean
#  user_id     :integer
#  listtype    :string(255)
#  description :text
#  roughlist   :boolean
#  created_at  :datetime         not null
#  updated_at  :datetime         not null
#

class List < ActiveRecord::Base
  attr_accessible :name, :active , :type , :description , :roughlist,  :listtype
  belongs_to :user, :foreign_key => :user_id
  has_many :map_list_items
  has_many :items, :through => :map_list_items
  #has_and_belongs_to_many :items

end

And my item schema is here

# == Schema Information
#
# Table name: items
#
#  id          :integer          not null, primary key
#  name        :string(255)
#  description :string(255)
#  user_id     :integer
#  barcode     :string(255)
#  asin_id     :string(255)
#  isbn_id     :string(255)
#  barcode_id  :integer
#  created_at  :datetime         not null
#  updated_at  :datetime         not null
#

class Item < ActiveRecord::Base
  belongs_to :barcode , :foreign_key => :barcode_id
  has_many :map_item_tags
  has_many :map_list_items
  has_many :lists, :through => :map_list_items
  #has_and_belongs_to_many :lists

end

我得到的json文件样本位于

之下

{
    "total": 3,
    "page": 1,
    "limit": 10,
    "userId": 5,
    "accessToken": "BAAFdQiIeExEBAOwtEtFXgI0c2k9kka3EQbEBDca2FGJZBQyIOLGfnJQr7k1FaGFEx6dzzWxQkxZB4uFSEj3HvZARyZBKLtTzn9NhEXEBtsBxuPBf2O5PxtofkZC4GQg9OmWGahJ42kZBuEay68rlDb",
    "list": [
        {
            "description": "",
            "id": 1,
            "listtype": "christmas",
            "name": "mom"
        },
        {
            "description": "",
            "id": 2,
            "listtype": "christmas",
            "name": "mom"
        },
        {
            "description": "",
            "id": 3,
            "listtype": "christmas",
            "name": "mom"
        }
    ]
}

Answer 1

对json使用acts_as_api gem。它使得即使通过模型也能轻松制作json。在那里，您可以简单地添加自己的归因。

需要在Ruby on rails上生成的结果列表中添加别名

1 个答案: