Hello,
you have an error here:
| defsave(self,*args,**kwargs):
super().save(*args,**kwargs)
self.set_slug()
|
self.set_slug() should be before super().save().
Regards,
Antonis Christofides
http://djangodeployment.com
On 2016-12-10 02:26, Viet Phuong wrote:
> (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.
>
> |
> classTopList(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()
>
> defsave(self,*args,**kwargs):
> super().save(*args,**kwargs)
> self.set_slug()
>
> defset_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
> classTopListForm(ModelForm):
> classMeta:
> model =TopList
> fields =('name',)
>
> # Item is just a model which has foreignkey relationship with TopList
> ItemFormSet=inlineformset_factory(TopList,Item,fields=('name',))
> |
>
> |
> # views.py
> defnew_list(request):
> form =TopListForm()
> item_formset =ItemFormSet()
>
> ifrequest.method =='POST':
> form =TopListForm(request.POST)
> ifform.is_valid():
> created_list =form.save(commit=False)
> item_formset =ItemFormSet(request.POST,instance=created_list)
> ifitem_formset.is_valid():
> created_list.save()
> item_formset.save()
> returnredirect('/danh-sach')
>
>
> returnrender(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 noattribute '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,inmanager_method
> returngetattr(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,inget
> self.model._meta.object_name
> lists.models.DoesNotExist:TopListmatching query does notexist.
> >>>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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