从belongs

从belongs_to关联中跳过validates_presence_of(Skip validates_presence_of from a belongs_to association)

如果条件为真，我正试图跳过belongs_to关联的验证。 以下是我的代码

class Venue < ActiveRecord::Base has_many :events validates_presence_of :name, :postcode, :category end class Event < ActiveRecord::Base belongs_to :venue accepts_nested_attributes_for :venue end

所以我需要做的是，如果Events模型中的条件为真，则跳过Venues validates_presence_of验证。 因此，假设event_type等于'1'，则它将忽略Venues validates_presence_of调用，但如果event_type为'2'，则它仍将执行validates_presence_of调用。

I'm trying to skip validations of a belongs_to association if a criteria is true. Below is my code

class Venue < ActiveRecord::Base has_many :events validates_presence_of :name, :postcode, :category end class Event < ActiveRecord::Base belongs_to :venue accepts_nested_attributes_for :venue end

So what I need to do is skip the Venues validates_presence_of validation if a criteria from the Events model is true. So lets say if the event_type was equal to '1' then it will ignore the Venues validates_presence_of call but if event_type was '2' then it will still execute the validates_presence_of call.

最满意答案

这个主题有一个Railscast 。 您还可以查看Rails Conditional Validation

根据上面的链接，你必须传递一个lambda，如：

:if => lambda { |venue| venue.event.try(:event_type) == 2 }

In the end I did something very similar to this