ruby - Virtus 和 bool 值转换

Question

我正在使用 Virtus gem 并尝试将字符串自动转换为 bool 值，但没有成功...如果您能看出这段代码有什么问题...

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

尝试使用 Axiom::Types::Boolean 而不是 Boolean 以防你已经定义了一个 Boolean 类。

class BookingWizard
  include Virtus

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

如果这可行，您可能有一个 ::Boolean 类，它在 Virtus 类之前被发现。在 pry 中使用 show-source Boolean找到您的 Boolean 类。