Hey all,
Been trying to display multiple form rows for a project lately, and I
just wanted to confirm that I'm doing this right. I found a solution
on http://www.pointy-stick.com/blog/2009/01/23/advanced-formset-usage-django/
, and I took what I needed from it (my code below), but I found that
whenever I passed in my request.POST data it was getting overwritten
by the users and resource data. So then I in checks for data and try
statements to make sure everything was going where it should.
Everything works now, but I'm not sure if I'm leaving some sort of
important edge case unattended too, or what. So my question is: is the
way that I'm handling errors here the correct way of doing multiple
form rows? And if not, why not? Surprise, I'm new to both Python and
Django, which is why I want to make sure I'm doing this both "django"-
ly and "pythonic"-ly.
#VIEW
@login_required
def manage_roles(request, resource_id):
resource = get_object_or_404(Lock, pk=resource_id)
if(request.method == "POST"):
formset = create_roles_formset(resource, request.POST)
if formset.is_valid():
for form in formset.forms:
#Haven't actually hooked up the templates and success logic yet.
print form.cleaned_data['role']
print form.cleaned_data['user']
print '-'
else:
formset = create_roles_formset(resource)
dictToSend['rolesForm'] = formset
dictToSend['resource'] = resource
return render_to_response('locks/manage_roles.html', dictToSend,
context_instance=RequestContext(request))
def create_roles_formset(resource, data=None):
users = User.objects.filter(lockmembership__lock=resource)
if not users:
raise Http404('Invalid user id(s)')
ResourceFormset = formsets.formset_factory(ResourceRoleForm,
ResourceRolesFormset)
if not data:
return ResourceFormset(data, users=users, resource=resource)
else:
return ResourceFormset(data)
#FORMS
class ResourceRolesFormset(formsets.BaseFormSet):
def __init__(self, *args, **kwargs):
if 'resource' in kwargs and 'users' in kwargs:
self.resource = kwargs.pop("resource")
self.users = list(kwargs.pop("users"))
self.extra = len(self.users)
super(ResourceRolesFormset, self).__init__(*args, **kwargs)
def _construct_form(self, i, **kwargs):
try:
kwargs["user"] = self.users[i]
kwargs["resource"] = self.resource
except AttributeError:
pass
return super(ResourceRolesFormset, self)._construct_form(i,
**kwargs)
class ResourceRoleForm(forms.Form):
role = forms.ChoiceField(widget=forms.Select,
choices=LockMembership.LOCK_ROLES)
user = forms.IntegerField(widget=forms.HiddenInput)
def __init__(self, *args, **kwargs):
print kwargs
try:
resource = kwargs.pop("resource")
user = kwargs.pop("user")
except KeyError:
pass
super(ResourceRoleForm, self).__init__(*args, **kwargs)
try:
lm = LockMembership.objects.filter(lock=resource,
user=user)[0]
self.fields['role'].initial = lm.role
self.fields['role'].label = user.username
self.fields['user'].initial = user.id
except KeyError:
pass
except UnboundLocalError:
pass
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