igalelo.igunya
Ukuba i-ForeignKey isusiwe kwi-Django, naziphi na iirekhodi ezihambelanayo kwi-database ziya kususwa kwakhona.
-models foreign-key cascade I have a model with a ForeignKey to another model. When the referenced model is deleted, I want the ForeignKey to be set to NULL. How can I do that? Read this post in context
Django - how to get all objects from one table which are not in another table? django I have two models: class Product(models.Model): name = models.CharField(max_length=255) price = models.DecimalField(decimal_places=2, max_digits=10) class OrderItem(models.Model): product = models.ForeignKey('Product', on_delete=models.CASCADE) quantity = models.IntegerField() def __str__(self): return self.product How can i get all products which are not in OrderItem? Read this post in context
Django - how to create an object with a foreign key that doesn't exist yet django I am trying to create an object with a foreign key that doesn't exist yet (the user). The user will be created after the object is created and then it will be assigned as the foreign key for the object later on when it exists (in another view). This is my code: def add_to_cart(request, pk): product = get_object_or_404(Product, pk=pk) orderitem, created = OrderItem.objects ... Read this post in context
Django – uyila njani into ngesitshixo sangaphandle esingekabikho django Ndizama ukwenza into ngesitshixo sangaphandle esingekabikho (umsebenzisi). Umsebenzisi uya kudalwa emva kokuba into yenziwe kwaye emva koko iya kwabelwa njengesitshixo sangaphandle sento kamva xa ikhona (komnye umbono). Le yikhowudi yam: def add_to_cart(isicelo, pk): imveliso = get_object_or_404(Imveliso, pk=pk) orderitem, idalwe = OrderItem.objects ... Funda esi sithuba ngokomxholo
Django – uyila njani into ngesitshixo sangaphandle esingekabikho django Ndizama ukwenza into ngesitshixo sangaphandle esingekabikho (umsebenzisi). Umsebenzisi uya kudalwa emva kokuba into yenziwe kwaye emva koko iya kwabelwa njengesitshixo sangaphandle sento kamva xa ikhona (komnye umbono). Le yikhowudi yam: def add_to_cart(isicelo, pk): imveliso = get_object_or_404(Imveliso, pk=pk) orderitem, idalwe = OrderItem.objects ... Funda esi sithuba ngokomxholo
Ndingayenza njani i-Django isebenzise eyam igama lokugqitha le-hashing algorithm? I-django Ndifuna i-Django isebenzise igama lam eliyimfihlo le-hashing algorithm endaweni yokungagqibekanga kwayo. Ndingayenza njani lento? Funda esi sithuba ngokomxholo
Yintoni iForeignKey
I-ForeignKey yintsimi yemodeli ebhekisela kwimodeli kwenye imodeli.
on_delete iinketho
Kukho iindlela ezimbalwa ezahlukeneyo zokuphatha ucimo kwi-Django. Olona khetho lulula kukusebenzisa umsebenzi wokucima ():
cima (into)
Oku kuya kucima into esuka kwisiseko sedatha kunye nayo nayiphi na idatha ehambelana nayo. Ukuba into ngumzekelo womzekelo, iya kwenza kwakhona nayiphi na imimandla ehambelana nayo.
Olunye ukhetho kukusebenzisa ukutshabalalisa () umsebenzi:
