Rails 序列化数据验证 [英] Rails Serialized Data Validations

问题描述

我有一个通过默认 AR 行为序列化为 YAML 的字段.它目前在一个哈希数组中，例如:

I have a field that is serialized to YAML through the default AR behavior. It is currently in an Array of Hashes for examples:

[{'name' => 'hi', 'url' => 'bye'}, 
 {'name' => 'hi', 'url' => 'bye'}, 
 {'name' => 'hi', 'url' => 'bye'}]

有没有办法可以在其中一些字段上使用一些基本的 AR 验证?

Is there a way I can use some basic AR validations on some of these fields?

推荐答案

是的，使用 validates_each 方法

serialize :urls
validates_each :urls do |record, attr, value|
  # value is an array of hashes
  # eg [{'name' => 'hi', 'url' => 'bye'}, ...]

  problems = ''
  if value
    value.each{|name_url| 
      problems << "Name #{name_url['name']} is missing its url. " \
        unless name_url['url']}
  else
    problems = 'Please supply at least one name and url'
  end
  record.errors.add(:urls, problems) unless problems.empty?
end

添加:您不能使用诸如 validates_length_of 之类的验证，因为验证方法不了解您的序列化字段的格式.

Added: You can't use the validations such as validates_length_of since the validation method doesn't understand the format of your serialized field.

validates_each 方法很好，因为它使您能够编写自己的验证方法.如果合适，该方法然后可以向记录添加错误.

The validates_each method is good since it enables you to write your own validation method. The method can then add an error to the record if appropriate.

提示:您还可以将错误添加到 record.errors 的 :base 而不是特定属性.有时，这有助于在您的视图中格式化错误消息.

Tip: You can also add an error to the :base of record.errors rather than to the specific attribute. Sometimes this can help with the formatting of the error messages in your views.

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