ruby-on-rails-3 - 如果除一个以外的所有字段均为空白，是否可以使用reject_if 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东西

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? ) 
                               }

Answer 2

受此启发：https ://rails.lighthouseapp.com/projects/8994/tickets/2501-any_blank-and-all_blank-options-for-accepts_nested_attributes_for-reject_if

这对我来说很好：

reject_if: proc { |attributes| attributes.all? {|k,v| v.blank? || ['foo', 'bar', 'baz'].include?(k)} }

如果只有一个异常，则可以替换['foo', 'bar', 'baz'].include?(k)为，但第一种语法使 proc 为多个异常做好了准备。k == 'foo'