ruby-on-rails - Rails 验证包含动态

Question

class A
  include ActiveModel::Validations
  attr_reader :operator
  def initialize(operator)
    @operator = operator
    validates_inclusion_of :operator, in => operators
  end

  def operators
    ....
  end
end

在这里，我想动态验证 inclusion_of 运算符。方法运算符返回一个动态的运算符数组。

以上代码无效。如何动态实现验证？ r

Answer 1

你可以试试:

def initialize(operator)
  self.class.class_eval do
    validates_inclusion_of :operator, :in => operators
  end
end

虽然我不明白为什么你不能直接在类级别定义它。请注意，:in 的参数可以是 lambda，有关详细信息，请参阅:http://apidock.com/rails/ActiveModel/Validations/HelperMethods/validates_inclusion_of