cannot write custom validator for required parameter

[siemionides]

strange thing.
in my params block

params do
    optional :date_range, date_range_proper_order: true, type: Hash do
      requires :from, type: Integer # epoch
      requires :to, type: Integer # epoch
    end
end

post 'filtered_customer_groups' do
  filtered_customer_group_service = FilteredCustomerGroupsService.new(params)
  FilteredCustomerGroupsSerializer.new(filtered_customer_group_service).as_json
end

I'm trying to use custom validator date_range_proper_order in order to validate following JSON:

  "date_range": {
                    "from": 14123244920000,
                    "to": 14137932920000
                }

so the from wouldn't be lower than to.
Here's the validators code

class DateRangeProperOrder < Grape::Validations::Validator
  def validate_param!(attr_name, params)
    unless params[attr_name][:from] <= params[attr_name][:to]
   # Grape::API.logger.info params.inspect
    raise Grape::Exceptions::Validation, params: [@scope.full_name(attr_name)], message: "'from' must be lower or equal to 'to'"
  end
 end
end

That works as expected. However, if I change optional into requires for :date_range, the Grape won't run and it will throw

 ArgumentError: ArgumentError
                      new_scope at /Users/michalsiemionczyk/.rvm/gems/jruby-1.7.15/gems/grape-0.9.0/lib/grape/validations.rb:149
                       requires at /Users/michalsiemionczyk/.rvm/gems/jruby-1.7.15/gems/grape-0.9.0/lib/grape/dsl/parameters.rb:31
         FilteredCustomerGroups at /Users/michalsiemionczyk/Projects/yeti-backend/app/filtered_customer_groups.rb:22

Which points directly to the optional and requires line of code.
Why is that? Why cannot I use custom validator for required paramer (a Hash?)

I've created the issue on StackOverflow (http://bit.ly/1oPHxQX) but no help frmo there so far, so I published it in here

[dblock]

This smells like a bug. Would be helpful if you could turn this into an RSpec spec in a pull request, please.

[dm1try]

Here some specs - https://github.com/intridea/grape/blob/master/spec/grape/validations_spec.rb#L230
https://github.com/intridea/grape/blob/master/spec/grape/validations_spec.rb#L284

/cc @bwalex
Why @siemionides cannot use custom validator for required paramer with Hash type?)
Thanks!

PS if we'll skip this condition(single argument) all specs are green.

[bwalex]

@siemionides things should work now that #799 has been merged. Give that a spin and let us know if it works for you.

[dblock]

I believe this is fixed, closing.