Question

I have multiple models like this:

class Model1(models.Model):
    user = models.ForeignKey(User)
    model1_filed1 = models.CharField()


class Model2(models.Model):
    user = models.ForeignKey(User)
    model2_filed1 = models.CharField()

....

As you can see all the models have a filed user = models.ForeignKey(User) on each model so when I save my model data I know what user saved it.

On my project I need to:

1. Do a search on model1_filed1 (Moldel1). Something like find all the records from Model1 that have model1_filed1 containing the string “foo”.

2. Once I find Model1 records containing the tring “foo” on the mode1_filed1 join all the records from Model2 that have the same user id as the Model1 records just found.

Any ides?

Answer 1

# 1
m1 = Model1.objects.filter(model1_filed1__contains='foo')

# 2
m2 = Model2.objects.filter(user__in=[x.user_id for x in m1])

# or one-liner for # 2, may be heavier for DB than two requests
m2 = Model2.objects.filter(user__model1__model1_filed1__contains='foo')