Multiple models and a primary key

[dahlen...@gmail.com]

Ok, thanks for replying. am quite new in Django. Am looking for a way to use a primary key in 3 models in my django project. for instance. The models are Profile, Subject and Grade. Want subject to link to profile and grade to link to subject.

class Profile(models.Model): f_name = models.CharField(max_length=20) l_name = models.CharField(max_length=20) sch_id = models.CharField(max_length=20) class Subject(models.Model): profile = models.ForeignKey(Profile, on_delete=models.CASCADE) maths = models.CharField(max_length=20) english = models.CharField(max_length=20) class Grade(models.Model): subjt = models.ForeignKey(Subject, on_delete=models.CASCADE) score = models.CharField(max_length=20) grad = models.CharField(max_length=20)

I don't know to archive this.

[Michael MacIntosh]

I'm not sure what you are trying to achieve, but you probably don't want all of the models to use the same primary key.
You can access the primary key though via the pk or id attributes.  For instance:
Grade.objects.all().values("subjt_id", "subjt__pk", "subjt__profile_id", "subjt__profile__pk")
However, I am not sure what you are trying to do.

Hope that helps!

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[麦田的守望者]

OnetoOneField may what you want!

---Original---

From: "Michael MacIntosh"<mmaci...@linear-systems.com>

Date: 2018/2/17 09:42:29

To: "django-users"<django...@googlegroups.com>;

Subject: Re: Multiple models and a primary key

To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/efe4f2c4-af50-ce96-053e-1d97e010a9f2%40linear-systems.com.