从rails中的整数或小数中去除逗号 [英] Stripping commas from Integers or decimals in rails

问题描述

整数或小数是否有等效的 gsub?gsub 应该使用整数吗?基本上我只是想将十进制输入到 ruby​​ 形式以及用户能够使用逗号的内容.例如，我希望用户能够输入 1,000.99.

Is there a gsub equivalent for integers or decimals? Should gsub work with integers? Basically I'm just trying to enter decimal into a ruby form and what the user to be able to use commas. For example, I want the user to be able to enter 1,000.99.

我试过使用

before_save :strip_commas

def strip_commas
    self.number = self.number.gsub(",", "")    
end

但得到以下错误8:Fixnum 的未定义方法`gsub'"，其中8"被用户输入的任何数字替换.

but get the following error "undefined method `gsub' for 8:Fixnum" where "8" is replaced with whatever number the user enters.

推荐答案

如果您的字段是 Fixnum，则它永远不会有逗号，因为 Rails 必须将用户输入转换为数字才能将其存储在那里.

If your field is a Fixnum, it will never have commas, as Rails will have to convert the user input into a number in order to store it there.

但是，它会通过在输入字符串上调用 to_i 来实现，这不是您想要的.将普通的 setter 覆盖为类似

However, it will do that by calling to_i on the input string, which is not what you want. overriding the normal setter to something like

def price=(num)
  num.gsub!(',','') if num.is_a?(String)
  self[:price] = num.to_i
end

未经测试，但类似的东西应该可以工作...

Not tested, but something resembling this should work...

您需要在输入仍然是字符串时获取逗号.

You need to get at the commas while the input is still a string.

正如评论中所指出的，如果您想接受小数并创建不是整数的东西，则需要与 String.to_i 不同的转换.此外，不同国家/地区对数字标点符号有不同的约定，因此这不是一个完整的解决方案.

As noted in comments, if you want to accept decimals, and create something not an integer, you need a different conversion than String.to_i. Also, different countries have different conventions for numeric punctuation, so this isn't a complete solution.

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