HI all,
I have the follow models . I want to find all the categories from the
UserCategory table along with the budget for each category from the
UserBudget model. I tried with select_related and prefetch and filtered
with user_id but then it only returns budget that has matched with user_id.
But i want to retrieve all the categories whether user has budget or not.
class UserCategory(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
cat = models.ForeignKey('preference.Category', null=True,
on_delete=models.CASCADE)
is_active = models.BooleanField(default=True)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
class Category(models.Model):
name = models.CharField(max_length=255)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
is_active = models.BooleanField(default=True)
class UserBudget(models.Model):
cat = models.ForeignKey('preference.Category', on_delete=models.CASCADE)
user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
budget = models.DecimalField(default=0.00, decimal_places=2, max_digits=20)
is_active = models.BooleanField(default=True)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
I tried following approach :
user_cats =
UserCategory.objects.prefetch_related('cat__userbudget_set__user').filter(user_id=user_id)
Enter code here...
But the above query only returns UserCategory that matched with the
user_id. But i want the following result.
select uc.id as cat_id, uc.user_id cat_user, ub.user_id as budget_user,
ub.cat_id as budget_cat from user_categories as uc
left outer join user_budget as ub on uc.id = ub.cat_id
where uc.user_id = 2
Please help. Thanks.
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