(My English is not so good so I'll just try to be simple, sorry guys)
So I have a model TopList which has a slug field so I can look up its
object by slug.
class TopList(models.Model):
name = models.CharField(max_length=200)
slug = models.SlugField(max_length=200, default='')
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.set_slug()
def save(self, *args, **kwargs):
super().save(*args, **kwargs)
self.set_slug()
def set_slug(self):
self.slug = slugify(self.name, allow_unicode=True)
The problem is when I use a ModelForm to create object, the slug field is
set correctly, but when I use it to look up the object, it returns
"lists.models.DoesNotExist: TopList matching query does not exist" (I tried
it in the shell):
# forms.py
class TopListForm(ModelForm):
class Meta:
model = TopList
fields = ('name',)
# Item is just a model which has foreignkey relationship with TopList
ItemFormSet = inlineformset_factory(TopList, Item, fields=('name',))
# views.py
def new_list(request):
form = TopListForm()
item_formset = ItemFormSet()
if request.method == 'POST':
form = TopListForm(request.POST)
if form.is_valid():
created_list = form.save(commit=False)
item_formset = ItemFormSet(request.POST, instance=created_list)
if item_formset.is_valid():
created_list.save()
item_formset.save()
return redirect('/danh-sach')
return render(request, 'lists/new_list.html', context={'form': form,
'item_formset': item_formset})
But if I use TopList.objects.create(name='something') to create object,
slug is still set correctly, and I can retrieve it by slug.
# "test test" is an object I created earlier using form
>>> TopList.object.get(slug='test-test')
Traceback (most recent call last):
File "<console>", line 1, in <module>
AttributeError: type object 'TopList' has no attribute 'object'
>>> TopList.objects.get(slug='test-test')
Traceback (most recent call last):
File "<console>", line 1, in <module>
File
"/home/vietphuong/Documents/Python/toptenproject/venv/lib/python3.5/site-packages/django/db/models/manager.py"
, line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File
"/home/vietphuong/Documents/Python/toptenproject/venv/lib/python3.5/site-packages/django/db/models/query.py"
, line 385, in get
self.model._meta.object_name
lists.models.DoesNotExist: TopList matching query does not exist.
>>> TopList.objects.create(name='another test')
<TopList: another test>
>>> TopList.objects.get(slug='another-test')
<TopList: another test>
Another thing is after I try to save that "test test" object, just save no
changing at all, I can now look it up.
>>> TopList.objects.get(name='test test')
<TopList: test test>
>>> t = TopList.objects.get(name='test test')
>>> t.slug
'test-test'
>>> t.save()
>>> TopList.objects.get(slug='test-test')
<TopList: test test>
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