2

在控制器中我有这样的代码:

    @bank_exchangers = ExchangerList.find(:all, :conditions => {:bank_id => params[:id]})
    @currency_list = CurrencyList.all
    @currencies = []
    @currency_list.each do |c|
      @currencies << CurrencyValue.find(:all, :conditions => {:currency_list_id => c.id}, :order => :updated_at)
    end
    @currencies.flatten!

我有这样的模型:

class CurrencyList < ActiveRecord::Base
  attr_accessible :code, :country, :name
  has_many :currency_values
end


class CurrencyValue < ActiveRecord::Base
  attr_accessible :currency_list_id, :direction_of_exchange_id, :value
  belongs_to :currency_list
  belongs_to :exchanger_list
end


class ExchangerList < ActiveRecord::Base
  attr_accessible :address, :bank_id, :exchanger_type_id, :latitude, :location_id, :longitude, :name
  has_many :currency_values
end

我需要在某些条件下为每个 ExchangerList 显示它的 CurrencyValue,如下所示……但主要问题在于 rabl 输出:

我有这样的代码:

collection @bank_exchangers, :root => "bank_exchangers", :object_root => false
attributes :id, :name, :address, :location_id, :latitude, :longitude, :exchanger_type_id
child @currencies do 
  attribute :value 
end

正如你所看到的,这里为每个@bank_exchangers 我创建了带有@currencies 的节点......但是我只需要为这个@bank_exchangers 迭代器显示节点,如果我要在控制器中写入,我会写如下内容:

@currencies << CurrencyValue.find(:all, :conditions => {:currency_list_id => c.id, :exchanger_list_id => param}, :order => :updated_at)

如何在视图中设置这样的东西?

因为现在我的输出是这样的:

{"bank_exchangers":[{"id":3,"name":"Банк *** ЦБУ №1","address":"г. Минск, ул. Московская, 13","location_id":8,"latitude":null,"longitude":null,"exchanger_type_id":1,"location_name":"Минск","exchanger_type_name":"normal","currency_values":[{"currency_value":{"value":8620.0}},{"currency_value":{"value":8620.0}},{"currency_value":{"value":8700.0}},{"currency_value":{"value":8700.0}},{"currency_value":{"value":8620.0}},{"currency_value":{"value":8700.0}},{"currency_value":{"value":11500.0}},{"currency_value":{"value":11100.0}}]},{"id":4,"name":"Банк ***","address":"г. Минск, Мясникова, 32","location_id":8,"latitude":null,"longitude":null,"exchanger_type_id":1,"location_name":"Минск","exchanger_type_name":"normal","currency_values":[{"currency_value":{"value":8620.0}},{"currency_value":{"value":8620.0}},{"currency_value":{"value":8700.0}},{"currency_value":{"value":8700.0}},{"currency_value":{"value":8620.0}},{"currency_value":{"value":8700.0}},{"currency_value":{"value":11500.0}},{"currency_value":{"value":11100.0}}]}]}

如您所见,对于每个 bank_exchangers,我使用所有 currency_values 数据创建节点,但我需要为每个 bank_exchangers 在节点中仅放置此 bank_exchangers 父级的 currency_values ......

我怎么能这样做?

对不起,如果有什么不清楚...我是新来的...

鉴于某些情况,如何为我的孩子设置@currencies?

4

1 回答 1

0

您可以利用 ExchangerList 和 CurrencyValues 之间的关系:

child :currency_values do
  attribute :value
end

如果您有条件,可以使用 lambda 包含这些条件: if => lambda { |child| 孩子。什么?})

child(:currency_values, if => lambda { |currency_value| currency_value.something? }) do
  attribute :value
end

您可能还想为一个 ExchangerList 对象定义一个视图(即显示):

object @bank_exchanger, :object_root => false
attributes :id, :name, :address, :location_id, :latitude, :longitude, :exchanger_type_id

child(:currency_values, if => lambda { |currency_value| currency_value.something? }) do
  attribute :value
end

然后简单地让集合扩展这个:

collection @bank_exchangers, :root => "bank_exchangers", :object_root => false
extends 'bank_exchangers/show'

或者,如果您将“货币”方法添加到 ExchangerList 模型,您可以通过 RABL 直接将该方法作为属性调用。我写的一些测试代码:

def test
  test_array = []
  1.upto(3) do |i|
    test_array << {qty: i, px: 2*i}
  end
  return test_array
end

然后,您可以简单地将其称为属性:

object @object
attribute :test

这会产生以下 JSON,我认为这与您尝试实现的格式相似:

test: [
  {
    qty: 1,
    px: 2
  },
  {
    qty: 2,
    px: 4
  },
  {
    qty: 3,
    px: 6
  }
],
于 2013-04-13T21:43:32.507 回答