ruby-on-rails-3 - 如果除一个字段之外的所有字段都为空，是否可以使用 reject_if 来拒绝嵌套资源？

Question

我知道你可以拥有:

accepts_nested_attributes_for :foo, :reject_if => proc { |a| a[:bar].blank? }

有没有办法代替说类似的话

accepts_nested_attributes_for :foo, :reject_if => blah[:bar].blank? and flah[:bar].blank?

或者

accepts_nested_attributes_for :foo, :reject_if => all fields except record_date.blank?

谢谢

Answer 1

我在这方面有点晚了，但你可以这样做:

accepts_nested_attributes_for :foo, 
                               reject_if: ->(attributes){ 
                                 attributes.except(:key).values.all?( &:blank? ) 
                               }