在 Ruby on Rails 表单中输入数字时的小数和逗号 [英] Decimals and commas when entering a number into a Ruby on Rails form

问题描述

允许用户在表单中输入数字时使用小数或逗号的最佳 Ruby/Rails 方式是什么?换句话说，我希望用户能够在我的数据库中输入 2,000.99 而不是 2.00.

What's the best Ruby/Rails way to allow users to use decimals or commas when entering a number into a form? In other words, I would like the user be able to enter 2,000.99 and not get 2.00 in my database.

对此有最佳实践吗?

-- 更新 ---

gsub 是否适用于浮点数或大整数?或者，当在表单中输入浮点数或整数时，rails 会自动切断 , 处的数字吗?我尝试使用 self.price.gsub(",", "") 但得到未定义的方法 `gsub' for 8:Fixnum"，其中 8 是我在表单中输入的任何数字.

Does gsub work with floats or bigintegers? Or does rails automatically cut the number off at the , when entering floats or ints into a form? I tried using self.price.gsub(",", "") but get "undefined method `gsub' for 8:Fixnum" where 8 is whatever number I entered in the form.

推荐答案

我在尝试在表单中使用本地化内容时遇到了类似的问题.使用 ActionView::Helpers::NumberHelper 内置方法本地化输出相对简单，但 ActiveRecord 不支持解析本地化输入.

I had a similar problem trying to use localized content inside forms. Localizing output is relatively simple using ActionView::Helpers::NumberHelper built-in methods, but parsing localized input it is not supported by ActiveRecord.

这是我的解决方案，如果我做错了什么，请告诉我.在我看来，要成为正确的解决方案太简单了.谢谢！:)

This is my solution, please, tell me if I'm doing anything wrong. It seems to me too simple to be the right solution. Thanks! :)

首先，我们给String添加一个方法.

First of all, let's add a method to String.

class String
  def to_delocalized_decimal
    delimiter = I18n::t('number.format.delimiter')
    separator = I18n::t('number.format.separator')
    self.gsub(/[#{delimiter}#{separator}]/, delimiter => '', separator => '.')
  end
end

那我们在ActiveRecord::Base

class ActiveRecord::Base
  def self.attr_localized(*fields)
    fields.each do |field|
      define_method("#{field}=") do |value|
        self[field] = value.is_a?(String) ? value.to_delocalized_decimal : value
      end
    end
  end
end

最后，让我们声明哪些字段应该对输入进行本地化.

Finally, let's declare what fields should have an input localized.

class Article < ActiveRecord::Base
  attr_localized :price
end

现在，您可以在表单中输入1.936,27"，ActiveRecord 不会在无效数字上引发错误，因为它变成了 1936.27.

Now, in your form you can enter "1.936,27" and ActiveRecord will not raise errors on invalid number, because it becomes 1936.27.

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