How to add object to queryset?

Question

my sample code is :

from django.db import models
from django.contrib.auth.models import User

class Category(models.Model):
    user = models.ForeignKey(User, null=True)
    ....

I want do some thing like this in view :

user = User.objects.none()

categories = Category.objects.filter(**filter)

for category in categories:

    # my problem is here , how add user category object to queryset
    # or merge object and queryset
    user = user | category.user

this part of code is for showing problem :

    user = user | category.user

thanx .

Daniel Roseman · Accepted Answer · 2013-09-29 07:22:14Z

2

You can't do that. A Queryset is a container for objects that satisfy a query, hence the name. It's not a container for arbitrary objects.

Here the correct thing to do is to query the users you need directly. You can follow the relationship to the Category object by using the double-underscore syntax:

users = User.objects.filter(category__criteria=value)

answered Sep 29, 2013 at 7:22

Daniel Roseman

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1 Comment

sdnaghdi Over a year ago

I need find the way with best performance ,that`s costly to do some thing like this. but thanx

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