Question

我根据active_state验证Realty对象，因此如果它待处理，则允许多个字段为blank。

with_options :if => Proc.new { |a| a.active_state == 'pending'} do |realty|
  realty.validates :street, :length => {:in => 1..100}, :allow_blank => true
  realty.validates :postalcode, :numericality => {:only_integer => true}, :length => {:in => 4..5}, :allow_blank => true
  realty.validates :city, :length => {:in => 1..50}, :allow_blank => true
  realty.validates :description, :length => {:maximum => 8000}, :allow_blank => true
  realty.validates :leasing_costs, :numericality => {:only_integer => true}, :length => {:in => 1..9}, :allow_blank => true
end

with_options :if => Proc.new { |a| a.active_state != 'pending'} do |realty|
  realty.validates :street, :length => {:in => 1..100}
  realty.validates :postalcode, :numericality => {:only_integer => true}, :length => {:in => 4..5}
  realty.validates :city, :length => {:in => 1..50}
  realty.validates :description, :length => {:maximum => 8000}
  realty.validates :leasing_costs, :numericality => {:only_integer => true}, :length => {:in => 1..9}
end

唯一的区别是那些:allow_blank => true选项。

我想让这段代码更干，所以我的尝试是使用普通的验证块一次：

validates :street, :length => {:in => 1..100}
validates :postalcode, :numericality => {:only_integer => true}, :length => {:in => 4..5}
validates :city, :length => {:in => 1..50}
validates :description, :length => {:maximum => 8000}
validates :leasing_costs, :numericality => {:only_integer => true}, :length => {:in => 1..9}

然后只需在所有这些字段上调用一些函数，以防状态为挂起：

with_options :if => Proc.new { |a| a.active_state == 'pending'} do |realty|
  realty.allow_blank_of :street, :postalcode, :city, :description, :leasing_costs
end

与所有validates_uniqueness_of :x, :y, :z方法类似。

我无法找到符合我需要的功能。我该如何处理？

Answer 1

如果:allow_blank选项采用过程会很好，但我不认为它会这样做。但是，您可以使用:if选项获得相同的结果，因为:allow_blank实际上是一种说法＆＃34;如果属性为空，则不要运行此验证要求＆＃34; 。所以试试这个：

with_options :if => Proc.new { |a| a.active_state == 'pending' ? a.present? : true } do |realty|
  realty.validates :street, :length => {:in => 1..100}
  realty.validates :postalcode, :numericality => {:only_integer => true}, :length => {:in => 4..5}
  realty.validates :city, :length => {:in => 1..50}
  realty.validates :description, :length => {:maximum => 8000}
  realty.validates :leasing_costs, :numericality => {:only_integer => true}, :length => {:in => 1..9}
end

本案例中的proc表示......如果active_state为'pending'且属性存在，则执行此验证。但是，如果active_state不是'pending'，则该属性不允许为空，因此请始终运行验证。我希望我能根据你的需要得到正确的逻辑。

Answer 2

来自pdobb's answer

但是，使用：if可以获得相同的结果选项自：allow_blank本质上是一种说法＆＃34;如果是属性为空，则不要运行此验证要求＆＃34;。

基于pdobbs说明allow_blank => true实际上做了什么，我可以将验证范围缩小到：

validates :street, :length => {:in => 1..100}, :unless => :pending?
validates :postalcode, :numericality => {:only_integer => true}, :length => {:in => 4..5}, :unless => :pending?
validates :city, :length => {:in => 1..50}, :unless => :pending?
validates :description, :length => {:maximum => 8000}, :unless => :pending?
validates :leasing_costs, :numericality => {:only_integer => true}, :length => {:in => 1..9}, :unless => :pending?

def pending?
   active_state == "pending"
end

如果active_state是＆＃34;等待＆＃34;那么我就跳过所有这些验证。

分配更多DRY：）

Answer 3

我没有运行这个，但我认为这可能有用

before_commit :build_callback_validator, :on => :create

def build_callback_validator
  validates :street, :length => {:in => 1..100}
  validates :postalcode, :numericality => {:only_integer => true}, :length => {:in => 4..5}
  validates :city, :length => {:in => 1..50}
  validates :description, :length => {:maximum => 8000}
  validates :leasing_costs, :numericality => {:only_integer => true}, :length => {:in => 1..9}
  if self.active_state != 'pending'
    self.allow_blank_of :street, :postalcode, :city, :description, :leasing_costs
  end
end

验证多列的allow_blank

3 个答案: