money-rails，Money＃==仅支持零数字

Question

我money-rails在Rails应用程序中使用了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。我最近跑步，bundle update所以我想有些东西已经更新。我的gemfile样子是这样的：

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

我的实现如下所示：

# 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，这已经解决了，所以我不确定是什么在破坏它。

有任何想法吗？

更新资料

为了测试，我尝试了以下方法。

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)

它似乎有效。我觉得有点奇怪。

更新资料

这是我尝试保存记录时的回溯信息：

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"/Users/[user]/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/irb/ruby-lex.rb:232:inloop'“，” / Users / [用户] /。rvm / rubies / ruby​​-2.5.1 / lib / ruby​​ / 2.5.0 / irb /ruby-lex.rb:232：在block in each_top_level_statement'", "/Users/[user]/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/irb/ruby-lex.rb:231:incatch'“，” / Users / [用户] /。rvm / rubies / ruby​​-2.5.1 / lib / ruby​​ / 2.5.0 / irb / ruby​​-lex.rb：231 ：in each_top_level_statement'", "/Users/[user]/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/irb.rb:487:ineval_input'“ block in run'", "/Users/[user]/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/irb.rb:427:in，” / Users / [用户] /。rvm / rubies / ruby-2.5.1 / lib / ruby / 2.5.0 / irb.rb ：428 ：in catch'“，” // Users / [用户] /。rvm / rubies / ruby​​-2.5.1 / lib / ruby​​ / 2.5.0 / irb.rb：427：inrun'", "/Users/[user]/.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/irb.rb:383:in开始”，“ / Users / [用户] /。rvm / gems / ruby​​-2.5.1 / gems / railties-5.1.6 / lib / rails / commands / console / console_command.rb：62：in start'", 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Answer 1

您在编写规范时也可能会遇到此错误：

expect(order.subtotal).to eq 123.45
# ArgumentError:
#   Money#== supports only zero numerics

expect(order.subtotal).to eq Money.new(12345)
# works!

Answer 2

该错误来自模型的数值验证。

Money gem不允许将Money对象与Number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​​较任意数字和给定货币数量的金额。

钱轨宝石再次带有它自己的验证器：

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

回溯显示您正在使用rails数字验证器。