Rails中的条件验证

Question

I have a model. In some cases I need to validate all its fields for presence and another kinds of stuff, in other cases I need to validate only some of them and other fields can remain empty. What's the best way to achieve this?

Answer 1

Check this

validates_presence_of :state, :if => :in_us?

def in_us?
  country == 'US'
end

Here it validates presence of state only if country is US. For other country id dosen't validates state.

For detail: http://railscasts.com/episodes/41-conditional-validations

Answer 2

您可以使用条件验证。请参考文档http://guides.rubyonrails.org/active_record_validations.html#5.1