ruby-on-rails - 如何将项目添加到 json 对象 ruby​​ on rails？

Question

我想连接 2 个表中的项目。有输出:

 "costs":[  
  {  
     "id":2,
     "cost_name":"rent office",
     "user_id":2,
     "fix":true,
     "amount":300300,
     "created_at":"2018-11-05T18:36:19.108+06:00",
     "updated_at":"2018-11-05T18:36:19.108+06:00"
  },
  {  
     "id":3,
     "cost_name":"new computer",
     "user_id":2,
     "fix":false,
     "amount":350000,
     "created_at":"2018-11-06T14:44:49.805+06:00",
     "updated_at":"2018-11-06T14:44:49.805+06:00"
  }


 ],
   "users":[  
      [  
         "Vi_Ok",
         2
      ]
   ]
}

我想将用户参数(用户名是“Vi_Ok”)添加到每个成本中。您如何注意到两个表中都存在 userId。现在代码看起来:

def index
@costs = Cost.all 
@user_name = @costs.pluck(:user_id)
@user_name = User.find(@user_name).pluck(:name, :id)
# @costs.push("name" => @user_name.pluck(:name) this one just try to add 
render json: {costs: @costs, name: @user_name}

结束

Answer 1

您可以在您的模型中编写一个自定义方法并在索引操作中调用它，它会返回用户名的所有成本，如下所示:

def self.list_costs
  cost_list = []
  costs = Cost.all
  costs.each do |cost|
    cost_info = cost.attributes
    cost_info[:user_name] = cost.user.name
    cost_list << cost_info
  end
  cost_list
end  

class CostsController < ApplicationController
  def index
    render json: {costs: Cost.cost_list }
  end
end