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

在表单中输入数字时，允许用户使用小数或逗号的最佳Ruby/Rails方法是什么?换句话说，我希望用户能够输入2,000.99而不会在我的数据库中获得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.

这是否有最佳实践?

-更新---

gsub是否可以与浮点数或bigintegers一起使用?还是当在表格中输入浮点数或整数时，rails会自动在处切断数字吗?我尝试使用self.price.gsub(，"，")，但得到"8:Fixnum的未定义方法'gsub'"，其中8是我在表格中输入的任何数字.

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内置方法对输出进行本地化相对简单，但是ActiveRecord不支持对本地化的输入进行解析.

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，请告诉我是否做错了什么.在我看来，太简单了，无法找到正确的解决方案.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，让我们为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

然后让我们向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的输入应该本地化.

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

class Article < ActiveRecord::Base
  attr_localized :price
end

现在，您可以在表格中输入"1.936,27"，并且ActiveRecord不会对无效数字产生错误，因为它变为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.

这篇关于在Ruby on Rails表单中输入数字时的小数和逗号的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！