convert sql query form to django orm - django

Question

I Have a models like this :
class Person(models.Model):
person_id=models.AutoField(primary_key=True)
person_name=models.CharField(max_length=100)
person_family=models.CharField(max_length=100)
person_father=models.ForeignKey('Person', related_name='child_from_father',null=True)
person_mother=models.ForeignKey('Person', related_name='child_from_mother',null=True)
def __str__(self):
return self.person_family
class Car(models.Model):
car_id=models.AutoField(primary_key=True)
car_name=models.CharField(max_length=100)
car_owner=models.ForeignKey(Person)
def __str__(self):
return self.car_name
there is some query that i want the orm form :
1: select person_name from Person
2: select *
from Person,Car
where car_owner=person_id
3: select *
from Person,Car
group_by(person_name)
4: select *
from Person,Car
where name like %x%
group_by(person_name)
having car_id >= 2
and at last do u know any good refrence for orm
thx for help

Answer 1

I'm assuming the group by is for ordering. If you really want group_by look at aggregates and annotate in django. My guess of what you are looking for is:
1: Get the person record - select person_name from Person
person = Person.objects.get(<WHERE clause>).values('person_name')
2: select *
from Person,Car
where car_owner=person_id
Get the cars belonging to the person
cars = Car.objects.filter(car_owner = person)
3: select *
from Person,Car
group_by(person_name)
Get list of cars sorted by owner
car_list = Car.objects.all().order_by('car_owner__person_name')
4: select *
from Person,Car
where name like %x%
group_by(person_name)
having car_id >= 2
List of cars with search criteria
car_list = Car.objects.filter(id__gte = 2, car_name__contains = "<search>").order_by('car_owner__person_name',)
Cars and their Owners
car_list = Car.objects.all().values('car_name','car_owner__person_name')