我是新来的rails,并且正在开发我的第一个rails项目之一,它是发票窗体中嵌套行项目的发票应用程序。我想在保存发票之前计算总发票。如果只是在保存过程中添加了项目,我可以很好地保存它,但如果其中一个嵌套行项目被标记为删除,则不会正确计算总计。我将不得不返回并再次保存以获得正确的总计费用。Rails嵌套窗体,在嵌套项目中计算值
class Invoice < ActiveRecord::Base
attr_accessible :job_name, :items_attributes, :tax1, :tax2, :subtotal
before_save :calculate_totals
has_many :items, :dependent => :destroy
accepts_nested_attributes_for :items, allow_destroy: true
private
def calculate_totals
self.subtotal = 0
self.items.each do |i|
self.subtotal = self.subtotal + (i.quantity * i.cost_per)
end
end
end
我注意到这是如何不同于PARAMS但问题条目记录与请求PARAMATERS上市:_destroy =真
{"utf8"=>"✓",
"_method"=>"put",
"authenticity_token"=>"+OqRa7vRa1CKPMCdBrjhvU6jzMH1zQ=",
"invoice"=>{"client_id"=>"1",
"job_name"=>"dsdsadsad",
"items_attributes"=>{"0"=>{"name"=>"jhksadhshdkjhkjdh",
"quantity"=>"1",
"cost_per"=>"50.0",
"id"=>"21",
"_destroy"=>"false"},
"1"=>{"name"=>"delete this one",
"quantity"=>"1",
"cost_per"=>"10.0",
"id"=>"24",
"_destroy"=>"true"}}},
"commit"=>"Update Invoice",
"id"=>"8"}
感谢您帮助。
感谢您编写此解决方案,它帮助我解决了我的问题 – widjajayd