post - Django form not updating existing record even when instance is passed -

i have form used create , edit model instance. when editing model instance, form still tries create new record , fails because unique fields exist. passing instance when initializing form.

views.py

def organization_course_detail(request, org_id):     '''     courses associated organization     '''     template_name = 'users/organization-course-list.html'     organization = models.organization.objects.get(id=org_id)      if request.method == 'post':         print organization.id         form = forms.createorganizationform(request.post, instance=organization)         if form.is_valid():             print 'form valid'             org = form.save(commit=false)             org.save()             return httpresponseredirect(                 reverse('users:org-course-list',                         kwargs={'org_id': org_id}))     else:         form = forms.createorganizationform(instance=organization) 

forms.py

class createorganizationform(forms.modelform):     '''     form used create new organization. @ same time,     create new course clone of "chalk talk sat"     , associate course organization , student     signs organization     '''      class meta:         model = models.organization         fields = ['name', 'country', 'acronym',] 

models.py

class organization(models.model):     '''     model have every institution     (test prep centers, governments, schools) workshops     @ or create school accounts     '''     name = models.charfield(max_length=2000)     country = countryfield(null=true, blank='(select country)')     date = models.datetimefield(default=timezone.now)     acronym = models.charfield(max_length=7, help_text="(up 7 characters)")     expiration_date = models.datetimefield(default=timezone.now)      def get_org_admins(self):         return self.admin_for_organizations.all()      class meta:         unique_together = (             ('name', 'country')         )     def __str__(self):         return self.name 

have looked @ entries in db table? (or can post them?)

you might try using django shell , try execute code hand (query db org_id , check result. edit field , save it. work?)

also think blank can true or false here.

country = countryfield(null=true, blank='(select country)')

https://docs.djangoproject.com/en/1.11/ref/models/fields/#django.db.models.field.blank