Support 'blank' for ActionController::Parameters

[zentooo]

Description

My use case:

    # This is RESTful JSON API for updating operator resource (PATCH /operators/:operator_id)
    def update
      param! :operator_id, Integer, required: true
      param! :operator, Hash, required: true, blank: false # this 'blank: false' does not work because params[:operator] is an instance of ActionController::Parameters
      param! :update_mask, Array, required: true

      operator = Operator.find_by(id: params[:operator_id])
      # omitted
      return render json: operator
    end

[iMacTia]

@zentooo it seems like we were missing support for the new Rails 5 ActionController::Parameters, and your PR is adding them correctly.
Thanks also for improving and extending the tests.
The failure in the CI is not your fault and it's something I'm investigating, so your tests should pass after that is fixed

[zentooo]

@iMacTia
Thank you for merging PR.
Could you release a new version of gem?

[iMacTia]

There are 3 issues marked as bugs that I would like to have a look at, in case there's any quick-fix.
After that I'm happy to ship a v0.11.0 👍

[iMacTia]

@zentooo v0.11.0 should now be available on Rubygems 🎉

[zentooo]

@iMacTia Thank you!