[limit_choices_to example for Django GenericForeignKey] limit model choice to specified model #Django #Python #GenericForeignKey

models.py

from django.db import models
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes import generic


class Poll(models.Model):
    question = models.CharField(max_length=500)
    answers = # ...
    # ...
    limit = models.Q(app_label='your_app', model='page') | \
        models.Q(app_label='your_app', model='article')
    content_type = models.ForeignKey(
        ContentType,
        verbose_name=_('content page'),
        limit_choices_to=limit,
    )
    object_id = models.PositiveIntegerField(
        verbose_name=_('related object'),
    )
    content_object = generic.GenericForeignKey('content_type', 'object_id')