Question

我必须建模：Tag和TagNumeric每个category字段

我不能创建具有相同类别的不同类型的标签。我该如何验证？

编辑：

我忘了提及

TagNumeric＆lt;标签

class Tag
 include Mongoid::Document

 validates_presence_of :type, :value

 field :category, type: String
 field :value, type: String
 field :color, type: String
 validates :value, :presence => true, :uniqueness => {:scope => :category}



class TagNumeric < Tag

  field :value, type: Integer

it 'its category should be unique within the Tag class type' do
  Tag.create(category: 'Movie', value: 'Avatar')
  TagNumeric.create(category: 'Movie', value: 'Iron man').should_not be_valid
end

Answer 1

如果有人遇到同样的问题我是如何解决它的

validate :uniqueness_within_category
def uniqueness_within_category
  first_category_type = (Tag.find_by(category: self.category).nil?)? 'none' : Tag.find_by(category: self.category)._type
  if first_category_type == 'none'
    #It doesnt exist then should be allowed
    return
  end
  #If it exists within another class type then shouldnt be allowed
  if self._type != first_category_type
    errors.add(:category, 'Must be unique within tag type')
  end
end

测试于下午6:22开始......

1个例子，0个失败，1个传递

rails验证继承中的唯一性

1 个答案: