Rails +单表继承：如何自定义验证错误消息？

bigpotato 发表于 Dev

大potate

我有一个家长班：

class Address < ActiveRecord::Base
  ...
  validates_presence_of :first_name
  validates_presence_of :last_name
  validates_presence_of :street_address
  validates_presence_of :street_address2
  validates_presence_of :zip_code
  validates_presence_of :city
  validates_presence_of :state_id
  validates_presence_of :phone_number

end

还有两个子类：

class ShippingAddress < Address
end


class BillingAddress < Address
end

但是，当我在表单上创建无效记录时（一次创建两个记录），ShippingAddress和BillingAddress的验证错误是相同的，我不希望这样做：

First name can't be blank
First name can't be blank
Last name can't be blank
Last name can't be blank
Street address can't be blank
Street address can't be blank
Street address2 can't be blank
Street address2 can't be blank
Zip code can't be blank
Zip code can't be blank
City can't be blank
City can't be blank
Phone number can't be blank
Phone number can't be blank

我如何在验证错误前加上类名like "Shipping address first name can't be blank"？

==更新==

尝试时Yoshi的答案无效：

class Address < ActiveRecord::Base  
  validates_presence_of :first_name, message: I18n.t("activerecord.errors.models.#{self.model_name.to_s.underscore}.attributes.first_name")




Nets-Mac-Pro:ilook emai$ be rails c
Loading development environment (Rails 4.1.1)
irb(main):001:0> s = ShippingAddress.new
=> #<ShippingAddress id: nil, first_name: nil, last_name: nil, street_address: nil, street_address2: nil, zip_code: nil, phone_number: nil, created_at: nil, updated_at: nil, state_id: nil, city: nil, type: "ShippingAddress", order_id: nil>
irb(main):002:0> s.valid?
=> false
irb(main):003:0> s.errors.full_messages
=> ["First name translation missing: en.activerecord.errors.models.address.attributes.first_name", "Last name can't be blank", "Street address can't be blank", "Street address2 can't be blank", "Zip code can't be blank", "City can't be blank", "State can't be blank", "Phone number can't be blank"]

它说模型名称是Address而不是ShippingAddress。我猜这是渴望加载。

阿哈努比斯

Rails用于human_attribute_name将属性名称转换为人类可读的形式。您可以尝试在中重写此类方法，ShippingAddress并BillingAddress避免必须在区域设置文件中指定每个验证消息。

class ShippingAddress < Address
  def self.human_attribute_name(*args, &block)
    "Shipping address #{ super }"
  end
end

class BillingAddress < Address
  def self.human_attribute_name(*args, &block)
    "Billing address #{ super }"
  end
end

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