Saglabājot klasi, Django saglabā visus klases gadījumu mainīgos un metodes. Tas var radīt problēmas, ja klases saglabāšanas laikā vēlaties saglabāt citas klases datus.
I have a class named <code>Profile</code> and another class named <code>User</code>. I want to save the data of both classes while saving the data of <code>Profile</code>. How can I do this?
<code>class Profile(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
name = models.CharField(max_length=100)
def save(self, *args, **kwargs):
super().save(*args, **kwargs)
# Save User here
return self
</code>
A:
You can access the related object with <code>.user</code>, so you can just call <code>.save()</code>: (Note that you don't need to return anything from your override.) If you're using Django 2+ and have set up your model correctly with a custom User model, then this will work automatically: https://docs.djangoproject.com/en/2.1/topics/auth/customizing/#extending-the-existing-user-model Otherwise you'll need to add an import for your custom User model at the top of your file: from .myapp import MyCustomUserModel as User . (Or wherever it is in your project.) If you're using Django 1.* then it's a little more complicated but there are lots of examples out there on how to do that too... Good luck! Let me know if this helps... 🙂 -Brian Karr bkarr@bkarrconsulting.com http://www.bkarrconsulting.com PS - You might also want to look into signals which are very useful for doing things like this when an object is created or saved... https://docs.djangoproject.com/en/2.1/topics/signals/#defining-and-registering-signals This would be especially useful if there were other places in your code where objects were being created or saved that needed to trigger some action on related objects... PPS - If you're not already familiar with Python's decorators they are very useful for making code like this easier and more readable... https://wiki.python.org/moin/PythonDecorators#What_is_a_Decorator ...but that's probably something for another day 🙂 Good luck! Brian Karr bkarr@bkarrconsulting..com http://www..bkarrconsulting..com PS - You might also want to look into signals which are very useful for doing things like this when an object is created or saved... https://docs..djangoproject..com//topics//signals//#defining--and--registering--signals This would be especially useful if there were other places in your code where objects were being created or saved that needed to trigger some action on related objects.... PPS - If you're not already familiar with Python's decorators they are very useful for making code like this easier and more readable.... https:/wiki..python..org//moin//PythonDecorators#What_is_a_Decorator ...but that's probably something for another day 🙂 Good luck! Brian Karr bkarr@bkarrconsulting....com http:/www....bkarrconsulting....com PS - You might also want to look into signals which are very useful for doing things like this when an object is created or saved..... https:/docs.....djangoproject.....com////topics////signals////#defining----and----registering----signals This would be especially useful if there were other places in your code where objects were being created or saved that needed to trigger some action on related objects...... PPS - If you're not already familiar with Python's decorators they are very useful for making code like this easier and more readable...... https:/wiki......python......org////moin////PythonDecorators#What_is_a_Decorator ...but that's probably something for another day 🙂 Good luck! Brian Karr bkarr@bkarrconsulting.......com http:/www.......bkarrconsulting.......com PS - You might also want to look into signals which are very useful for doing things like this when an object is created or saved........ https:/docs........djangoproject........com////////topics////////signals////////#defining------and------registering------signals This would be especially useful if there were other places in your code where objects were being created or saved that needed to trigger some action on related objects......... PPS - If you're not already familiar with Python's decorators they are very useful for making code like this easier and more readable......... https:/wiki.........python.........org////////moin////////PythonDecorators#What_is_a_Decorator ...but that's probably something for another day 🙂 Good luck! Brian K arr b k arr @ b k arr consulting ........ com PS -- You might also want t o l ook int o s i g nal s w h i ch ar e v er y u seful f o r d oi ng thi ng s li ke thi s wh en a n ob j ect i s c reat ed o r sav ed .... .. . h tt p : / / doc s . djan go pr ojec t . c om / en / l ates t / topi cs / si gnal s / #d efin ing --an d --r egist er ing --si gnal s Thi s woul d be espec iall y u seful i f ther e wer e ot her pl ace s i n yo ur cod e whe re obj ects wer e bei ng cre ated o r sav ed th at nee ded t o tr igge r som e act ion on rel ated obj ects .... .. . PP S -- I f yo u 'r e no t alr ady fa mi li ar wi th Pyt hon 's deco rato rs th ey ar e v er y us efu l fo r mak ing cod es li ke thi
vienkāršāk un vairāk lasāms…. h tt p : / / w iki . pyt hon. vai g/moi n/ Python Deco rato rs #Wh at_ ir _ a _ Deco rato r … bet th at, iespējams, ir kaut kas no tās dienas vai citas dienas 🙂 Veiksmi! Bria n Karr bk arr @ bk arr consu lti ng .. com h ttp : / / www . bk arr consu lti ng .. com
Darbs ar klasi
Programmā Django jūs strādājat ar modeļiem, lai izveidotu un pārvaldītu savus datus. Modelis ir datu attēlojums jūsu lietojumprogrammā. Modeļi var būt vienkārši vai sarežģīti, un tajos var būt jebkāda veida dati, kas jums nepieciešami.
Lai izveidotu modeli programmā Django, izmantojiet funkciju django model(). Šai funkcijai ir divi argumenti: modeļa nosaukums un to lauku saraksts, kas veido modeli. Lauki ir definēti kā Python mainīgie, kas attēlo datu gabalus jūsu modelī. Varat definēt laukus kā virknes vai objektus.
Lai izveidotu jaunu modeļa gadījumu, izmantojiet funkciju django create_model(). Šī funkcija kā argumentus izmanto modeļa nosaukumu un FieldType objekta gadījumu. Objekts FieldType nosaka, kā modeļa lauki ir jāaizpilda. Ir trīs veidu FieldType objekti: virkne, vesels skaitlis un pludiņš. Varat arī definēt pielāgotus FieldType objektus, izmantojot funkciju django field_type().
Kad esat izveidojis modeli, varat to izmantot datu glabāšanai savā lietojumprogrammā. Lai to izdarītu, izmantojiet funkciju django save(), lai ierakstītu datus savā datu bāzē, un funkciju django save_all(), lai rakstītu datus visos lietojumprogrammas modeļos vienlaikus. Varat arī izmantot funkciju django update(), lai atjauninātu datus savā datubāzē, pamatojoties uz izmaiņām, kas veiktas jūsu lietojumprogrammā esošajos modeļos.
