ruby-on-rails - 如何在 Ruby on Rails 中编写可见字符计数验证

Question

(作为此问题的后续:In Jquery AND Rails, how to get visible character count of a string?)

假设您有一个带有嵌入链接和标签的字符串，如下所示:

 This string has <a href="http://www.google.com">some links</a> inside it.

那么用户可见的字符串是:

 This string has some links inside it.

完整字符串有 73 个字符，可见字符串只有 37 个字符。

假设我现在想编写一个 Rails 验证(自定义验证)来检查字符串的可见长度。即:

 validate :string_visible_length

 def string_visible_length
      #some code that verifies the character length of a field named :field_name
 end

有什么想法可以实现这一点吗？我需要去掉 html 标签，然后检查字符长度..

Answer 1

我认为你可以使用 strip links验证中的方法。

使助手在模型文件中可用:

  include ActionView::Helpers

这是验证:

  validate :string_visible_length

private

  def string_visible_length
    visible_string = strip_links(self.column_name) # where column_name is the field you need validated
    errors.add(:base, 'Visible string is too long') if visible_string.length > 20 # 20 is whatever length you need
  end