I am trying to optimise Django queries on my ecommerce website. One of the 
fundamental query is where I have no clue how to make efficient. It could 
be trivial and probably been known long time back. But I am new to Django 
and would appreciate any help. This is primarily for one to many or many to 
many relations.

Following is an example scenario:
(Please pardon my syntax as I want to put across the concept and not the 
exact django code unless it's really needed):

Model A:

class A(models.Model):
    # Fields of model A

Model B (which is related to A with foreign key):

class B(models.Model):
    a = models.ForeignKey('A', related_name='bs')

Now I would like to find out all As for which there is atleast one b. The 
only way I know is as follows:


But the above isn't an optimal way as with large of records in A and B, the 
above takes lot of time. It gets more inefficient if it's a many to many 

Could anyone please let me know the most efficient way to use django 
queryset for the above scenario?


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