Question

So here is the scenario. I get user_id and do a filter named generated. I want to show all the values of class C by order of check.

Here is my models.py

class A(models.Model):
    tob = models.ForeignKey(B)

    def something(self, user):
        return A.objects.filter(to_b=user)

class B(models.Model):
    bid = models.AutoField(primary_key=True)
    name = models.CharField(max_length=50)


class C(models.Model):
    name = models.CharField(max_length=50)
    tobid = models.ForeignKey(B)
    check = models.datetimeField()

Here is my views.py:

def generated(request,user_id):

    f= A()
    p = f.something(user_id) 

I can perform a for loop that will get all values of class C.

My views to fetch value from C

    for des in p:
        des_list = des.tob.bid
        des_list_final = C.objects.filter(tobid = des_list)

But the problem in here that everytime it takes one id from B and perform the filtering to C. But this will not give me the value of C order by check. Any idea how to overcome this?

Answer 1

I want to show all the values of class C by order of check.

C.objects.filter(tobid__id__in=[des.tob.bid.pk for des in p]).order_by('-check')

If you want to set the order permanently, use ordering:

class C(models.Model):

   class Meta:
     ordering = ['-check']