django / joined query

Question

Checked all docs and questions/answers here but not succesfull. Need your help. I've experience in pure PHP and MySQL, but frameworks kills me.

My models;

class Projects(models.Model):
id = models.AutoField(primary_key=True)
subject= models.CharField(max_length=50)
sender= models.ForeignKey(User, on_delete=models.CASCADE)#inserting django's default user id

This is django's default but edited auth_user table

    CREATE TABLE "auth_user"  (
  "id" integer NOT NULL PRIMARY KEY AUTOINCREMENT,
  "password" varchar(128) NOT NULL,
  "last_login" datetime NULL,
  "is_superuser" bool NOT NULL,
  "username" varchar(150) NOT NULL UNIQUE,
  "first_name" varchar(150) NOT NULL,
  "last_name" varchar(150) NOT NULL,
  "email" varchar(254) NOT NULL,
  "is_staff" bool NOT NULL,
  "is_active" bool NOT NULL,
  "date_joined" datetime NOT NULL,
  "tck_no" varchar(11) NOT NULL
)

When I want to fetch my project, I use normally;

SELECT u.*, p.* FROM users u, projects p WHERE u.id=p.sender;

Above code returns all fields on both table normally.

In django viewmodel;

@login_required(login_url="/login/")
def others_projects(request):
projectlist = Projects.objects.all().filter(sender_id=request.user.id)

Above code returns Projects table fields, but can not figured how to get first_name field matched record from users foreign key used?

Answer 1

If you are iterating through your projectlist you could access it as such.

projectlist = Projects.objects.filter(sender=request.user)
for p in projectlist :
    print(f'First name is {p.sender.first_name}')

https://docs.djangoproject.com/en/4.0/ref/models/querysets/#filter

https://docs.djangoproject.com/en/4.0/topics/db/examples/many_to_one/