Question

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!

我有这样的模特：

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

我需要为每个ExchangerList显示它的CurrencyValue有一些条件，正如我在下面提供的那样......但主要的麻烦是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我用@currencies创建节点...但我只需要为这个@bank_exchangers迭代器显示节点，如果我在控制器中写，我会写如下：

@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内容？

现在我的输出就像：

{"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}}]}]}

正如您所看到的，对于每个bank_exchangers，我使用所有currency_values数据创建节点，但我需要为节点中的每个bank_exchangers仅为该bank_exchangers父节点设置currency_values ....

我怎么能这样做？

很抱歉，如果事情不清楚......我是新人......

在某种情况下，如何为我的孩子设置@currencies？

Answer 1

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 =＆gt; lambda {| child | child.something？ }）

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（即show）定义一个视图：

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，如果将“currency”方法添加到ExchangerList模型，则可以通过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

然后您可以将其称为属性：

object @object
attribute :test

这导致以下JSON，我认为它与您尝试实现的格式相似：

test: [
  {
    qty: 1,
    px: 2
  },
  {
    qty: 2,
    px: 4
  },
  {
    qty: 3,
    px: 6
  }
],

Rails rabl条件为视图中的类变量

1 个答案: