Get Foreign Key objects in the query - django

Question

I have two models.
The first one represents different Projects with a name, an ID and a description
The second one is for tracking which user is in which Project.
So my models look like this:
from django.contrib.auth.models import User
# Create your models here.
class Project(models.Model):
id = models.AutoField(db_column = 'db_ID', primary_key = True)
name = models.CharField(max_length=500, default = None)
descriptor = models.CharField(max_length = 1000, null = True)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
class Meta:
db_table = 'projects'
def __str__(self):
return self.name
class Userproject(models.Model):
id = models.AutoField(db_column = 'db_ID', primary_key = True)
user = models.ForeignKey(User, on_delete= models.SET_NULL, null = True)
project = models.ForeignKey('Project', on_delete = models.SET_NULL, null = True)
created_at = models.DateTimeField(auto_now_add=True, null=True)
updated_at = models.DateTimeField(auto_now=True, null = True)
class Meta:
db_table = 'UserProjects'
def __str__(self):
return self.id
In the Userproject there there is only the UserID and the ProjectID, both are ForeignKeys to the other models.
When I get a GET-Request with a username, I can get the userID , then I can filter all the Userprojects by the userID and serialize all those where the given user is present. But How would I include the Project data as well If I want to send the name of the Project as well?

Answer 1

So you can run a query with power operators to filter data based on foreign object values.
user_projects = Userproject.objects.filter(user_id=user_id, project__name='yourproject')
Now to access project data from user_project you can use . operator.
if user_projects.exists():
print(user_projects[0].user_id)
print(user_projects[0].project.name)
print(user_projects[0].project.descriptor)
To get values directly from the ORM, use .values().
user_projects = Userproject.objects.filter(user_id=user_id, project__name='yourproject').values('project__name', 'project__descriptor)
This will fetch only the columns you specify as parameters.