mymodels.py

from django.db import models
from utils.models import BaseModel

class ActiveQuestionManager(models.Manager):
    def get_query_set(self):
        return super(ActiveQuestionManager, self).get_query_set().filter(is_active=True)
 
class PublicQuestionManager(models.Manager):
    def get_query_set(self):
        return super(PublicQuestionManager, self).get_query_set().filter(visible=True)
    
class QuestionManager(models.Manager):
    def create_question(self, title, explanation, code, visible=True, is_active=True):
        from django.template.defaultfilters import slugify 
        question = Question(title=title, slug=slugify(title), explanation=explanation, code=code, visible=visible, is_active=is_active)
        question.save()
        return question
    
    def update_question(self, question, **kwargs):
        for key, value in kwargs.items():
            setattr(question, key, value)
        question.save()
        return Question.objects.get(id=question.id)

class Question(BaseModel):
    title = models.CharField(max_length=100)
    slug = models.SlugField(max_length=100)
    explanation = models.TextField(max_length=200)
    code = models.TextField(max_length=1500)
    visible = models.BooleanField(default=True)
    is_active = models.BooleanField(default=True)
    publicquestions = PublicQuestionManager()
    activequestions = ActiveQuestionManager()
    objects = QuestionManager()
        
    class Meta:
        ordering = ['-created_on']
    
    def __unicode__(self):
        return self.title

utils.models.py

from django.db import models

class BaseModel(models.Model):
    id = models.AutoField(primary_key=True)
    created_on = models.DateTimeField(auto_now_add=True)
    modified_on = models.DateTimeField(auto_now=True)
    
    class Meta:
        abstract = True