如何仅加载 ActiveModel 验证？

Question

我想在一个小的 Roda 应用程序中使用 ActiveModel::Validations，我真的想保持它的小，我想避免在其中加载整个 ActiveModel。有没有办法只需要ActiveModel::Validations？

至少用activemodel-4.2.6. 尝试require 'active_model/validations' 结果是

/home/bbozo/.rvm/gems/ruby-2.2.4/gems/activemodel-4.2.6/lib/active_model/validations/format.rb:4:in `<module:Validations>': uninitialized constant ActiveModel::Validations::EachValidator (NameError)
        from /home/bbozo/.rvm/gems/ruby-2.2.4/gems/activemodel-4.2.6/lib/active_model/validations/format.rb:3:in `<module:ActiveModel>'
        from /home/bbozo/.rvm/gems/ruby-2.2.4/gems/activemodel-4.2.6/lib/active_model/validations/format.rb:1:in `<top (required)>'
        from /home/bbozo/.rvm/gems/ruby-2.2.4/gems/activemodel-4.2.6/lib/active_model/validations.rb:405:in `require'
        from /home/bbozo/.rvm/gems/ruby-2.2.4/gems/activemodel-4.2.6/lib/active_model/validations.rb:405:in `block in <top (required)>'
        from /home/bbozo/.rvm/gems/ruby-2.2.4/gems/activemodel-4.2.6/lib/active_model/validations.rb:405:in `each'
        from /home/bbozo/.rvm/gems/ruby-2.2.4/gems/activemodel-4.2.6/lib/active_model/validations.rb:405:in `<top (required)>'

嗯，好的，写这个问题我找到了解决方案^_^

Answer 1

我设法加载“仅”ActiveModel 验证及其依赖项，我最终需要

require 'active_support/concern'
require 'active_model/validator'
require 'active_model/validations'
require 'active_model/naming'
require 'active_model/callbacks'
require 'active_support/callbacks'
require 'active_model/translation

只是为了通过：

class Foo
  include ActiveModel::Validations
end

所以看来我需要整个活动模型或寻找替代验证框架。