How to perform query in Django - django

Question

I need to filter the a particular user's bar in whcih reservations were made. I am a beginner in Django and have tried some methods which unfortunately didn't work.
models.py
class User(AbstractBaseUser, PermissionsMixin):
email = models.EmailField(max_length=254, unique=True)
class Bar(models.Model):
user_id = models.OneToOneField(User, on_delete=models.CASCADE)
name = models.CharField(max_length=50)
def __str__(self):
return self.name
class Tables(models.Model):
table_no = models.CharField(max_length=14, unique=False)
bar = models.ForeignKey(to=Bar, on_delete=models.CASCADE)
def __str__(self):
return self.table_no
class Reservation(models.Model):
first_name = models.CharField(max_length=200)
table = models.ForeignKey(Tables, on_delete=models.CASCADE)
def __str__(self):
return self.first_name
Note: I wan to filter the reservations made in a particular user's bar

Answer 1

I know you might be having a hard time and its one the things you go through when you are learning..
1.Can you change this first
from
class Bar(models.Model):
user_id = models.OneToOneField(User, on_delete=models.CASCADE)
name = models.CharField(max_length=50)
def __str__(self):
return self.name
To
class Bar(models.Model):
user_id = models.ForeignKey(User, on_delete=models.CASCADE)
name = models.CharField(max_length=50, null=True)
def __str__(self):
return self.name
2.On querying your data can you can try this since our user will already on the bar
user_bar = Bar.objects.filter("Here you specify what you wanna filter by")
Or
user_bar = Bar.objects.get(id=pk)

Answer 2

When I used this query filter. it worked perfectly.
reservations = Reservation.objects.filter(table__bar__user_id=request.user)
subject title: People can come to the restaurant and book a reservation filling a form which uses the Reservation model. Then the reservation is connected to a Table which is connected to a bar and the owner of the bar. Now I need to be able to filter the reservations made in each bar owner restaurant.