Decorator for using form with django-piston and JSON-encoded POST body

gistfile1.py

from django.utils import simplejson as json                                                            

from piston.decorator import decorator


def validate_json(form_class, class_method=True):
    @decorator
    def wrap(f, *args, **kwargs):
        if class_method:
            request = args[1]
        else:
            request = args[0]
        form = form_class(json.loads(request.raw_post_data))

        if form.is_valid():
            setattr(request, 'form', form)
            return f(*args, **kwargs)
        else:
            return {'errors': form.errors}
    return wrap