ruby-on-rails - 有条件的回形针存在验证

Question

如果另一个字段确实存在，我如何验证回形针附件不存在？我试过：

validates_attachment :img, presence: false, if: :some_other_field?
def some_other_field?
  some_other_field
end

Answer 1

这里有类似的问题，我的解决方案是在def中进行比较

validate :check_image_with_title 

def check_image_with_title
   if !ctitle.blank? and cimage.blank?
      #If ctitle IS NOT empty and cimage IS empty, add a custom error message
      errors.add :key, "You need an image to go with your title"
      return false
    else
      return true
   end 
end

Answer 2

试试这个：-

validates_attachment :img, presence: true, if: :some_other_field?
def some_other_field?
  some_other_field.present?
end

Answer 3

您是否尝试过使用exists?，present?可能有效

validates_attachment :img, presence: false, if: :some_other_field?
def some_other_field?
  some_other_field.exists?
end