Rails:验证条件多次

Question

使用:Rails 3.0.3

我有这样的验证:

  validates_numericality_of :person_weight_kg, :greater_than => 0, :message => "value_must_be_number_over_zero", :if => :bmi_calculation?, :if => :is_metric?   

我想验证多个if条件(例如在示例中).但是,似乎Rails将这些语句视为OR.一个返回false,一个返回true,这使验证通过.

那么,我如何检查此验证是否满足两个if语句(bmi_calculation AND is_metric)？

Answer 1

使用lambda作为if条件:

validates_numericality_of :person_weight_kg, 
  if: -> record { record.bmi_calculation? && record.is_metric? }