Cannot restrict boolean param

[Fryie]

Basically what I want to to is this:

params do
  optional :password, allow_blank: false
  optional :generate_password, type: Boolean, values: [true]
  exactly_one_of :password, :generate_password
end

However, that won't even start up the app, because Grape / Virtus is complaining that true is not a valid value (which it truly isn't - true is not an instance of Virtus::Attribute::Boolean). Using values: [Virtus::Attribute.build(true)] runs the app, but does not seem to run the proper validation.

The only I was able to do this, was with

class Truthy < Grape::Validations::Base
  def validate_param!(attr_name, params)
    unless params[attr_name]
      raise Grape::Exceptions::Validation, params: [@scope.full_name(attr_name)], message: 'must be true'
    end
  end
end

params do
  optional :generate_password, type: Boolean, truthy: true
end

but I'm not sure why this doesn't work the way one would expect it to work.

[dblock]

Try writing a spec that reproduces this, I agree we should fix it. I also find the case where the only option for a boolean is true quite interesting.