Virtus和booleans转换

Question

我正在使用Virtus gem并试图将字符串自动转换为布尔值，但没有成功……如果你能看到这段代码出了什么问题...

Virtus.coercer do |config|
  config.string.boolean_map = { 'true' => true, 'false' => false }
end

class BookingWizard
  include Virtus

  extend ActiveModel::Naming
  include ActiveModel::Conversion
  include ActiveModel::Validations

  attribute :know_doctor, Boolean, default: false
end

1.9.3 (main):0 > b = BookingWizard.new
=> #<BookingWizard:0x007fea748bf338
 @know_doctor=false>
1.9.3 (main):0 > b.know_doctor = "true"
=> "true"
1.9.3 (main):0 > b.know_doctor
=> "true"
1.9.3 (main):0 > b.know_doctor.class
=> String
1.9.3 (main):0 > Virtus.coercer[String].to_boolean("true")
=> true

Answer 1

如果您已经定义了一个Boolean类，请尝试使用Axiom::Types::Boolean而不是Boolean。

class BookingWizard
  include Virtus

  attribute :know_doctor, Axiom::Types::Boolean, default: false
end

如果这样可以工作，那么您可能有一个在Virtus类之前找到的::Boolean类。在pry中使用show-source Boolean查找您的Boolean类。