Get all related field in Django model - django

Question

I am struggling to understand how one-to-many and many-to-many relation works in Django model. My schema looks something like this so far, I am open for suggestions to make it better.
A many-to-many relation between users and team. Also, there will be schedules that belong to a particular user of a team.
This is how my model looks like so far,
class Team(models.Model):
tid = models.AutoField(primary_key=True)
team_name = models.CharField(max_length=30)
manager_name = models.CharField(max_length=30)
class Schedule(models.Model):
sid = models.AutoField(primary_key=True)
user = models.OneToOneField(User)
date = models.DateField()
start_time = models.TimeField()
end_time = models.TimeField()
pay_rate = models.CharField(max_length=30)
location = models.CharField(max_length=50)
class BelongsTo(models.Model):
bid = models.AutoField(primary_key=True)
user = models.OneToOneField(User)
team = models.ForeignKey(Team, on_delete=models.CASCADE)
schedule = models.ForeignKey(Schedule, on_delete=models.CASCADE)
Question: I want to get the information of each user, what are their schedules and which team each schedule belongs to. How would I to do it? I have tried BelongsTo.objects.select_related().all(), but it is not working for me.
Note: I am open for suggestions, if something is wrong with my schema or model or the approach, please let me know.

Answer 1

BelongsTo is seems like utility table.So
BelongsTo.objects.all().values('user', 'team__team_name', 'schedule')

Answer 2

Your schema looks almost right, but I would modify it a little bit. In particular, I will change how Schedule is implemented. Instead of having a sid in the User Belongs To join-table, I would include the user and team in the Schedule table as foreign keys.
This is how the Django models should then look like:
class User(models.Model):
username = models.CharField(max_length = 200)
# put other fields like password etc. here
class Team(models.Model):
team_name = models.CharField(max_length=30)
manager_name = models.CharField(max_length=30)
user = models.ManyToManyField("User")
class Schedule(models.Model):
user = models.ForeignKey("User")
team = models.ForeignKey("Team")
date = models.DateField()
start_time = models.TimeField()
end_time = models.TimeField()
pay_rate = models.CharField(max_length=30)
location = models.CharField(max_length=50)
Note the following:
You don't need to have a primary key field in the models because Django adds a primary key field called pk or id automatically.
Note the absence of the User Belongs To model. Django implements join-tables like User Belongs To automatically when you use a ManyToManyField. See the Django docs on many-to-many relationships.
You also don't need on_delete = models.CASCADE on ForeignKey fields, because this is the default behavior.
To see how to get information about users, teams and schedule from this configuration of models, consult the Django documentation on making db queries. It's quite easy.