Question

I m stuck. Trying to get to what would seem like a simple validation working, but I still can t get this to work.

在座各位:

模型:

class Course < ActiveRecord::Base

 has_many :locations, :dependent => :destroy
 accepts_nested_attributes_for :locations, :allow_destroy => true

end

class Location < ActiveRecord::Base

  belongs_to  :course

  validates_presence_of :city,
                    :message => "City cannot be blank",
                    :allow_blank => true,
                    :if => Proc.new {|location| location.nil? || (!location.nil? && location.course.format !=  Live ) } 

end

我想要做的是,如果某个课程有任何东西,那么我会做些什么。选择了住所,然后可以节省一个空白城市。如果是的话,可以选择。格式是真的,留下了一个错误。

我认为,在没有确定地点的情况下,它正在着手进行验证工作。但是,在更新课程和改变生活模式时,验证工作并不奏效。

在铁路方面,你如何像我前面的表格一样,总是参考另一个栏目? 如果是新课程,那么该课程的开端是,在检查验证时,就没有设置了。确实如此。

提前感谢!

Answer 1

validates_presence_of :city,
                    :message => "City cannot be blank",
                    :allow_blank => true,
                    :if => Proc.new {|location| location.nil? || (!location.nil? && location.course.format !=  Live ) }

In above validation :allow_blank has no relation with :if block. Try like this

validates_presence_of :city,
                    :message => "City cannot be blank",
                    :if => Proc.new {|location|  your_conditions } 

Now this validation works when  your_condition  will return true.

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