How to create a django form with a select list initialized from a dynamic query?

I'm trying to build a form where a select list can be initialized from a tuple parameter I pass in on creation of the form object.

I tried doing the following, which worked for CREATING the form. But when I try to submit the form, I get an is_valid() = false error. In the example below the myrooms variable is the data I'd like to dynamically load upon initialization of the form. Any help here?

class SessionInfoForm(forms.ModelForm):

     def __init__(self, myrooms = None, *args, **kwargs):
         super(SessionInfoForm, self).__init__(*args, **kwargs)
         if myrooms != None:
             self.fields['room'].choices = myrooms

     class Meta:
         model开发者_开发百科 = SessionInfo
         fields = ["title", "room", "viewer_limit", "starttime", "endtime", "billing_type", "billing_value"]

Your are probably forgetting to pass the same list to myrooms when validating the results.

You have to pass it both for the rendering and the validating.

just change self.fields['room'].choices = myrooms to self.fields['room'].widget.choices = myrooms , i have already edited that into your question