money-rails, Money#== 仅支持零数字
money-rails, Money#== supports only zero numerics
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，但我最近开始收到以下错误：
Money#== supports only zero numerics
我不太确定是什么原因造成的，也不知道如何解决。我最近 运行 bundle update 所以我想有些东西已经更新了。我的 gemfile 看起来像这样：
gem 'money-rails', '~>1'
gem 'eu_central_bank', "~>1.3.0"
我的实现是这样的：
# 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，这已经起作用了，所以我不确定是什么破坏了它。
有什么想法吗？
更新
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。但如果我尝试：
money = Money.new(0, from_currency)
似乎有效。我觉得有点奇怪。
更新
这是我尝试保存记录时的回溯：
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错误来自对模型的数值验证。
货币 gem 不允许将货币对象与数字进行比较，除非数字为零。否则它希望您将金钱与金钱进行比较。
在 irb 中你可以试试：
```ruby
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，因为您无法真正将任意数字与给定货币的金额进行比较。
金钱-rails gem 再次带有它自己的验证器：
https://github.com/RubyMoney/money-rails#numericality-validation-options
您的回溯表明您正在使用 rails 数值验证器。
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!
Money Rails 自动将“_cents”添加到您要货币化的属性中。然后它创建一个 model.price 的实例，其中包括
<Money fractional:1500 currency:DKK>
因此，您不能执行 model.price + 10，因为它会导致出现错误。
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，以便您可以对它们进行总结等。
创建一个新的迁移文件，例如
rails g 迁移 AddMoneytizeToOrders
更改迁移文件，使其内容如下（将 column/attribute 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
在您的模型中，您必须包含
monetize :price_to_convert_cents
那么你可以使用例如(rails c) Order.last.price_to_convert + Model.last.price, 等等
请注意，您不能使用 self.[:price_to_convert]，因为 money rails 无法理解它，您会收到错误消息
money rails ActiveModel::MissingAttributeError (can't write unknown attribute...
因此使用self.price_to_convert代替
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，但我最近开始收到以下错误：
Money#== supports only zero numerics
我不太确定是什么原因造成的，也不知道如何解决。我最近 运行 bundle update 所以我想有些东西已经更新了。我的 gemfile 看起来像这样：
gem 'money-rails', '~>1'
gem 'eu_central_bank', "~>1.3.0"
我的实现是这样的：
# 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，这已经起作用了，所以我不确定是什么破坏了它。
有什么想法吗？
更新
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。但如果我尝试：
money = Money.new(0, from_currency)
似乎有效。我觉得有点奇怪。
更新
这是我尝试保存记录时的回溯：
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错误来自对模型的数值验证。
货币 gem 不允许将货币对象与数字进行比较，除非数字为零。否则它希望您将金钱与金钱进行比较。
在 irb 中你可以试试：
```ruby
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，因为您无法真正将任意数字与给定货币的金额进行比较。
金钱-rails gem 再次带有它自己的验证器：
https://github.com/RubyMoney/money-rails#numericality-validation-options
您的回溯表明您正在使用 rails 数值验证器。
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!
Money Rails 自动将“_cents”添加到您要货币化的属性中。然后它创建一个 model.price 的实例，其中包括
<Money fractional:1500 currency:DKK>
因此，您不能执行 model.price + 10，因为它会导致出现错误。 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，以便您可以对它们进行总结等。
创建一个新的迁移文件，例如 rails g 迁移 AddMoneytizeToOrders
更改迁移文件，使其内容如下（将 column/attribute 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
在您的模型中，您必须包含
monetize :price_to_convert_cents
那么你可以使用例如(rails c) Order.last.price_to_convert + Model.last.price, 等等
请注意，您不能使用 self.[:price_to_convert]，因为 money rails 无法理解它，您会收到错误消息
money rails ActiveModel::MissingAttributeError (can't write unknown attribute...
因此使用self.price_to_convert代替