Ticket #13972: form_utils.py

import inspect

def initial_accepts_request(request, form_class):
        """
        If fields in the given form uses dynamic initial values which accepts request argument it wraps them so that request is given
        to them when called.
        """
        
        initial = {}
        
        for name, field in form_class.base_fields.items():
                if callable(field.initial):
                        try:
                                if len(inspect.getargspec(field.initial)[0]) == 1:
                                        # We fight Python aliasing in for loops here
                                        initial[name] = (lambda fi: lambda: fi(request))(field.initial)
                        except:
                                pass
        
        if not initial:
                return form_class
        
        def wrapper(*args, **kwargs):
                initial.update(kwargs.get('initial', {}))
                kwargs['initial'] = initial
                return form_class(*args, **kwargs)
        
        return wrapper