invalid keyword argument for this function

[Nikhil Verma]

Hi All

I have the following models like this :-


class EventGenre(models.Model):
    genre_choices = models.CharField(max_length=255)
   
    def __unicode__(self):
        return self.genre_choices
   
class EventPublic(models.Model):
    choicelist = models.CharField(max_length=255)
  
    def __unicode__(self):
        return self.choicelist

class Category(models.Model):
    """
    Describes the Event Category
    """
   
    type = models.CharField(max_length=20,\
                                  choices=EVENT_TYPE,\
                                  help_text = "type of event"
                                  )
    # Genre of event like classical,rock,pop ,indie etc
    event_genre = models.ManyToManyField(EventGenre)
   
    # audience for this event like adults ,children etc
    event_public = models.ManyToManyField(EventPublic)
   
    def __unicode__(self):
        return self.type

This is my category form

class CategoryForm(forms.Form):
    type = forms.CharField(max_length=80, \
                           widget=RadioSelect(choices=EVENT_TYPE)
                           )
    event_genre = forms.ModelMultipleChoiceField(
                        queryset = EventGenre.objects.all(),
                        widget=CheckboxSelectMultiple,
                        required=False
                        )
    event_public = forms.ModelMultipleChoiceField(
                        queryset = EventPublic.objects.all(),                         
                        widget=CheckboxSelectMultiple,
                        required=False
                        )

This is my views.py

def eventcreation(request):
    if request.method == "POST":
        event_form = EventForm(request.POST,request.FILES,prefix="eventform")
        categoryform = CategoryForm(request.POST)
        if event_form.is_valid():
            event_obj = Event(
            venue_name = event_form.cleaned_data['venue_name'],
            date_created = event_form.cleaned_data['event_start_date'],
            date_completed = event_form.cleaned_data['event_end_date'],
            event_ticket_price = event_form.cleaned_data['event_ticket_price'],
            eventwebsite = event_form.cleaned_data['eventwebsite'],
            keyword = event_form.cleaned_data['keyword'],
            description = event_form.cleaned_data['description'],
            status = event_form.cleaned_data['status'],
            event_poster = event_form.cleaned_data['event_poster']
            )
        if categoryform.is_valid():
            category_obj = Category(
                            type = categoryform.cleaned_data['type'],
                            event_public = categoryform.cleaned_data['event_public'], # It is giving error
                            event_genre = categoryform.cleaned_data['event_genre'],   # It is giving error   
                            )
           
            category_obj.event_genre.add(event_genre),
            category_obj.event_public.add(event_public),
            category_obj.save()
           
           
        else:
            print "Form is getting Invalid"
    else:
      
        event_form = EventForm()
        categoryform = CategoryForm()
    return render_to_response('event/event.html',
                              {
                              'eventform':event_form,
                              'categoryform':categoryform,
                              },
                              context_instance=RequestContext(request)
                              )
           
I am trying to add a ManyToMany Field and gets this traceback :-

Exception Type: TypeError at /event/createevent/
Exception Value: 'event_public' is an invalid keyword argument for this function

Can anybody point out whats going wrong ?

Thanks in advance.


--
Regards
Nikhil Verma
+91-958-273-3156

[Sunny Nanda]

Hi Nikhil,

You can not use an object's M2M field until it has been saved to the db.

So, you would have to call the "save" method on the instance, or use "create" method to create the instance.

            category_obj = Category.objects.create(
                            type = categoryform.cleaned_data['type']
                            )
            event_public = categoryform.cleaned_data['event_public']
            event_genre = categoryform.cleaned_data['event_genre']
            category_obj.event_genre.add(event_genre),
            category_obj.event_public.add(event_public),
            # No need to call save here
            # category_obj.save() 

The reason behind this is that M2M Fields are represented by intermediate tables with references to the two linked objects. If you need to add a row in it, both referenced objects should already be saved in the db with valid primary keys.

H2H

-Sandeep

[Nikhil Verma]

Hi Sunny

I realized that earlier sunny, and cleared that defect but i get stuck into this error

Traceback:

Exception Type: TypeError at /event/createevent/

Exception Value: 'event_genre' is an invalid keyword argument for this function

Any help ?

Thanks in advance

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[Sunny Nanda]

Hi Nikhil,

Just to reiterate :), you need to remove both event_public & even_genre while creating the instance of the model, since both of them are M2M Fields. Take a look at the example in my previous mail.

If you are getting this exception somewhere else, please send that code snippet so we might able to see the problem.

Thanks,

Sandeep

On Saturday, June 30, 2012 8:14:28 PM UTC+5:30, Nikhil Verma wrote:

Hi Sunny

I realized that earlier sunny, and cleared that defect but i get stuck into this error

Traceback:

Exception Type: TypeError at /event/createevent/
Exception Value: 'event_genre' is an invalid keyword argument for this function

Any help ?

Thanks in advance

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[Nikhil Verma]

Hi Sunny

I am trying with this

            event_genre = event_form.cleaned_data['event_genre']
            event_public = event_form.cleaned_data['event_public']
            event_obj.save()
            category_obj.event_genre.add(event_genre),
      category_obj.event_public.add(event_public


and getting this traceback:-

Exception Type: TypeError at /event/createevent/

Exception Value: int() argument must be a string or a number, not 'QuerySet'

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[Nikhil Verma]

Yes its with the braces ")" also.

[Sunny Nanda]

This is a different error, and I don't see anything in the code snippet that might have caused this error (except if you are doing something in the Event model's save method)

You would need to debug it further, and pinpoint the location of this error.

Regards
Nikhil Verma
+91-958-273-3156

[Nikhil Verma]

Yes its different.I was trying to say i tried your way and get rid of that error.

Thanks

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