How to autosave Foreignkey value inside my second Model with the id of my first model object.??

[Anoop Sharma]

I have two models . Appname and Adspace ,I have a Foreignkey object
in second model which connects to my first model. Here is the Code

models.py

 class Appname(models.Model):
      name=models.CharField(max_length=150,blank=False,null=False,help_text='Add your new App')

      def __str__(self):
          return self.name

      def get_absolute_url(self):
          return reverse("dashapp:space",kwargs={'pk':self.pk})


class Adspace(models.Model):
      ad_space=models.CharField(max_length=150,blank=False,null=False) 
      app=models.ForeignKey('Appname', related_name='appnames',default=None, on_delete=models.CASCADE)
      PID_TYPE = (
    ('FN','FORMAT_NATIVE'),
    ('FNB','FORMAT_NATIVE_BANNER'),
    ('FI','FORMAT_INTERSTITIAL'),
    ('FB','FORMAT_BANNER'),
    ('FMR','FORMAT_MEDIUM,RECT'),
    ('FRV','FORMAT_REWARDED_VIDEO'),
)
     format_type=models.CharField(max_length=3,choices=PID_TYPE,default='FN',blank=False, null=False)

     def __str__(self):
          return self.ad_space

     def get_absolute_url(self):
          return reverse("dashapp:view")

modelForm

class AdspaceForm(forms.ModelForm):
    class Meta:
       model=Adspace
       fields=('ad_space',)

Views.py

class space(LoginRequiredMixin,CreateView):

       form_class=forms.AdspaceForm
       model=Adspace

Now I.m unable to fill my form as it says it app_id cannot be null
and i'm allowing user to input it. I want that the app which got clicked
 has its ID in the url (As I'm passing it through there).
What should i do that it gets autosave with the same id number by itself
 that is being passed in the url.

   

[Yavin Aalto Arba]

The whole point of a foreign key is that it's external\independent the related model - and you are going against that by giving the user the ability to enter it willy-nilly in one form. If you want to have a 2 key combo as primary key you can use unique_together without the second model as a FK   (https://docs.djangoproject.com/en/2.1/ref/models/options/#unique-together)

If you really insist on this design...You could make two forms (one for the appname and one for the other model without the appname) and set the saving of the second form with a save(commit=False). then, set the FK according to the first saved form input. It's pretty ugly imho but it can be done, cf.

https://stackoverflow.com/questions/569468/django-multiple-models-in-one-template-using-forms/575133#575133

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