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I have a question on how to update an existing row in my database when one of the fields is my primary key. I am using ModelForm and Django-Piston - my main goal here is to have RESTful Post send to my webservice. I am able to have initial Posts be sent correctly (i.e. that Primary key value doesn't exist yet). The problem is when I want to update a value where the Primary key already exists - when I issue a f.is_valid() it fails because "this UniqueIdentifier already exists". How can I do form validation using ModelForms to update an existing row? My models.py: from django.db import models class DeviceModel(models.Model): uniqueIdentifier = models.CharField(primary_key=True, max_length=100) deviceToken = models.CharField(max_length=100) forms.py from django import forms from models import DeviceModel class DeviceModelForm(forms.ModelForm): class Meta: model = DeviceModel handlers.py class DeviceHandler(BaseHandler): allowed_methods = ('POST', 'GET', 'DELETE',) def create(self, request): f = DeviceModelForm(request.POST) if f.is_valid(): new_object = f.save() return new_object return rc.BAD_REQUEST urls.py from django.conf.urls.defaults import * from piston.resource import Resource from api.handlers import DeviceHandler device_handler = Resource(DeviceHandler) urlpatterns = patterns('', (r'^api/$', device_handler, {'emitter_format': 'json'}), )

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