Question

我已经在rails模型中编写了一个自定义验证功能。我想检查确认仅更改了一个字段（在我的示例中，“ activestatus”字段从“ active”更改为“ inactive”）。该怎么做？

class Normaluser < ApplicationRecord
   validate :check_on_update, :on => :update
   validate :check_on_status_change :"***what to write here?***"
   private

   def check_on_update
    if is_cyclic?
        puts "hierarchy is cyclic"
        errors.add(:pid,'it is cyclic')

    elsif(get_height(id)+getDepth>=2)
        puts "height limit exceeded"
        errors.add(:pid,'height limit exceeded')
    elsif count_children>=4
        errors.add(:pid,'children limit exceeded')
    end
    puts "all is fine at update"
end

Answer 1

看看ActiveModel::Dirty。要仅在activestatus从active更改为inactive时运行验证，只需在自定义验证方法中添加一行：

def check_on_update
  return unless activestatus_changed?(from: 'active', to: 'inactive')

  # your validation code
end

Answer 2

您可以使用ActiveModel :: Dirty

if activestatus_was == 'active' && activestatus == 'inactive'
  # validation logic goes here
end

更多信息：https://api.rubyonrails.org/classes/ActiveModel/Dirty.html

希望有帮助！

Rails仅在更改特定字段值时才更新验证

2 个答案: