How to structure User - Team - Project model Django (ManyToMany) - django

Question

I'm hoping someone can give me a push in the right direction, at least conceptually. What I'm trying to achieve; a model where:
You have users, workstreams and projects;
Workstream should always be linked to a project (i.e. they exist "in" projects)
Users can be linked to a project without being a workstream;
Users can be in multiple teams and projects
I've read something about Models Managers before, should I use these?
Something else I'm struggling with is that users can/should be linked to projects directly or though a team, will this cause problems?
below some snippets from the models.py file
class User(models.Model):
email = models.EmailField(
verbose_name='email address',
max_length=255,
unique=True
)
first_name = models.CharField(max_length=100)
last_name = models.CharField(max_length=100)
class Workstream(models.Model):
name = models.CharField(max_length=100)
project = models.ForeignKey(Project, on_delete=models.CASCADE)
members = models.ManyToManyField(User) #Like this?
class Project(models.Model):
name = models.CharField(max_length=100)
members = models.ManyToManyField(User) #Like this?
Any help in the right directions will be greatly appreaciated!

Answer 1

It is not advisable to link users directly to a project if it is possible to link teams to the same project. It would be possible for a given user to be two times in a Project, as a individual user or as part of a team, and you would have to search for Users and Users inside Teams when looking for all Users linked to a Project, which is cumbersome. Or if a Workstream represents a task to be done inside a Project, it wouldn't make sense to have a User that is not inside a task to be done.
I don't know the specifics of your project, but maybe each User would join a Team that is already part of a Project. A User could join a Team and be the sole member.
class Workstream(models.Model):
name = models.CharField(max_length=100)
project = models.ForeignKey(Project, on_delete=models.CASCADE)
members = models.ManyToManyField(User)
class Project(models.Model):
name = models.CharField(max_length=100)
An admin could assign a Team to a Project or a user that has a 'project leader' privilege could assign a Team to a Project.