In how many ways can I get ManyToMany field data using Django ORM?

Question

Let's assume I have two models named A and B. In model B, I have a ManyToMany field for model A, so how many ways can I get data from model A using model B?:

class A(models.Model):
    name = models.CharField(...)

class B(models.Model):
    a = models.ManyToManyField(A)

Answer 1

The two most straightforward ways is by accessing the a manager of the model object of B, so:

model_b_object.a.all()

another way to retrieve the related objects, is by filtering the B model, so:

A.objects.filter(b=model_b_object)

If you defined a through model, for example:

class A(models.Model):
    name= models.CharField(...)

class B(models.Model):
    a= models.ManyToManyField(
        A
        through='C'
    )

class C(models.Model):
    a = models.ForeignKey(A, on_delete=models.CASCADE)
    b = models.ForeignKey(B, on_delete=models.CASCADE)

then you can also access this through:

A.models.objects.filter(c__b=model_b_object)

but this only will make the ORM call more complex, and less readable.