当我在rails中覆盖嵌套属性方法时会发生什么.例如,
class Order has_many :line_items accepts_nested_attributes_for :line_items def line_item_attributes=(attr) # what can I do here. end end class LineItem belongs_to :order end
在上面的代码中,
>里面的line_item_attributes =方法,我可以添加/修改/删除订单的行项吗？
>什么时候是line_items_attributes =被调用,如果我调用@ order.save(params)？
解决方法
>是的,你可以只要打电话
assign_nested_attributes_for_collection_association(：line_items,attributes,mass_assignment_options)
当你完成了
检查源：#文件activerecord / lib / active_record / nested_attributes.rb,第263行
>从文档：
Saving
All changes to models,including the destruction of those marked for
destruction,are saved and destroyed automatically and atomically when
the parent model is saved. This happens inside the transaction
initiated by the parents save method. See
ActiveRecord::AutosaveAssociation.