Please ,How to pass request.user to wizard form field?

sorry ,please forgive me my poor english.

  I  customize a FriendMultiplySelectedField which inherited from forms.ModelMultipleChoiceField , to query a list friend for choice . 

when I added __init__  function in form  to accept request.usr  and then pass it to FriendMultiplySelectedField.  i meet a problem with form validation .

    I found  the reason maybe field wizardform prefix had lost when added __init__ function in Form.

    Did I do something wrong, I wonder how does wizardform process __ init__, and if  remove __init__ function in form ,how can i pass request.user to field. thanks

### my customize field

class FriendMultiplySelectField(forms.ModelMultipleChoiceField):

    def __init__(self, user=None, cache_choices=False, required=True,

                 widget=None, label=None, initial=None,

                 help_text=None, *args, **kwargs):

        if  user != None:

            queryset = Friend.objects.filter(to_user_id=user)

        else:

            queryset = Friend.objects

        super(FriendMultiplySelectField, self).__init__(queryset,

                                                        cache_choices, required,

                                                        widget, label, initial,

                                                        help_text, *args, **kwargs)

class ProjectSettingForm(forms.Form):

    publish_now =  forms.BooleanField(label="publish now",required=False,initial=True)

    publish_time = forms.DateTimeField(required=False,label="publish time")

    def __init__(self,*args,**kwargs):

        self.user = kwargs.pop("user")

        super(ProjectSettingForm, self).__init__( args,kwargs)

        self.fields["people"] = FriendMultiplySelectField(required=False,label="asign to",user=self.user)

class CreateTask(SessionWizardView):

    file_storage = FileSystemStorage(location=os.path.join(settings.MEDIA_ROOT,'task_attachment'))

    def get_template_names(self):

        return [TEMPLATES[self.steps.current]]

    def get_form_kwargs(self ,step=None):

        kwargs = super(CreateTask,self).get_form_kwargs(step)

        if step == self.steps.last:

            kwargs.update(user=self.request.user)

        return kwargs

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