Question

我在Rails应用程序中使用money-rails gem。到目前为止，它一直运行良好，但是最近我开始出现以下错误：

Money#== supports only zero numerics

我不确定这是什么原因或如何解决。我最近运行过bundle update，所以我想某些内容已经更新。我的gemfile看起来像这样：

gem 'money-rails', '~>1'
gem 'eu_central_bank', "~>1.3.0"

我的实现如下：

# model
monetize :price_in_cents

# fetch / converting currencies
eu_bank = EuCentralBank.new
Money.default_bank = eu_bank
eu_bank.update_rates
converted_price = eu_bank.exchange_with(Money.new(price_to_convert * 100, from_currency), to_currency)

正如我之前提到的那样，这已经起作用了，所以我不确定是什么原因破坏了它。

有什么想法吗？

更新

为了测试，我尝试了以下操作。

money = Money.new(100, from_currency)

然后我得到了和以前一样的错误。但是，如果我尝试过：

money = Money.new(0, from_currency)

似乎可行。我觉得有点奇怪。

更新

这是我尝试保存记录时的回溯记录：

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Answer 1

该错误来自模型的数字验证。

Money gem不允许将货币对象与数字进行比较，除非您的数字为零。否则，它希望您将“金钱与金钱”进行比较。

在irb中，您可以尝试：

```红宝石

2.5.1 :006 > Money.new(1000, "USD") != Money.new(1000, "USD")
 => false 

2.5.1 :007 > Money.new(1000, "USD") != 1000
Traceback (most recent call last):
        4: from /Users/andi/.rvm/rubies/ruby-2.5.1/bin/irb:11:in `<main>'
        3: from (irb):7
        2: from (irb):7:in `!='
        1: from /Users/andi/.rvm/gems/ruby-2.5.1/gems/money-6.12.0/lib/money/money/arithmetic.rb:70:in `=='
ArgumentError (Money#== supports only zero numerics)

2.5.1 :008 > Money.new(1000, "USD") != 0
 => true

```

我相信这个错误是有道理的，因为您无法真正比较任意数字与给定货币下的金额。

Money-rails宝石再次带有其自己的验证器：

https://github.com/RubyMoney/money-rails#numericality-validation-options

您的回溯表明您正在使用rails数字验证器。

Answer 2

编写规范时，您可能还会遇到此错误：

//works fine
...
canvas.width  = 640;
canvas.height = 100;
ctx.drawImage(img, 0, 0);
...

//don't  works
...
canvas.width  = 1024;
canvas.height = 768;
ctx.drawImage(img, 0, 0);
...

Answer 3

Money Rails 会自动将“_cents”添加到您正在获利的属性中。然后它创建了一个 model.price 的实例，其中包括

<Money fractional:1500 currency:DKK>

因此，您不能执行 model.price + 10，因为它会导致您遇到的错误。因此，您可能希望通过 price_to_convert 或您正在使用的任何其他值获利，以便将它们汇总等。

创建一个新的迁移文件，例如 rails g 迁移 AddMoneytizeToOrders

更改迁移文件，使其读取如下（将列/属性更改为您的值）

class AddMonetizeToOrder < ActiveRecord::Migration[6.0]
  def change
    add_monetize :orders, :price_to_convert, currency: { present: false }
  end
end

在你的模型中你必须包含

monetize :price_to_convert_cents

然后你可以使用例如(rails c) Order.last.price_to_convert + Model.last.price 等

请注意，您不能使用 self.[:price_to_convert]，因为money rails 不会理解它，并且您会收到错误

money rails ActiveModel::MissingAttributeError (can't write unknown attribute...

因此改用 self.price_to_convert

money-rails，Money＃==仅支持零数字

3 个答案: