In Django, Model Managers are classes that act as the interface between Django models and the database. A Model can have any number of managers and using these managers we can extend the functionality of the model.

Introduction

An Introduction to Django Model Managers, we’ll start from the default model manager and then go through creating and customizing model managers.

In this post, we’ll take the example of a BlogModel and then create a custom model manager for it.

Create a Model

The first step is to create an app and name it blogs and make BlogModel in file models.py.

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

class BlogModel(models.Model): 

    BLOG_STATUS = (
        ('PUBLISH', 'Publish'),
        ('DRAFT', 'Draft'),
    )

    blog_id = models.AutoField(primary_key=True)
    user = models.ForeignKey( User, on_delete=models.CASCADE, related_name='blogs' )
    title = models.CharField(max_length=255)
    content = models.TextField(blank=True, null=True)
    status = models.CharField(max_length=7, choices=BLOG_STATUS)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta():
        db_table = 'blogs'
        verbose_name = 'Blog'
        verbose_name_plural = 'Blogs'

    def __str__(self):
        return self.title    

In BlogModel field user shares ForeignKey relationship with Django’s built-in AUTH_USER_MODEL.

#django framework #python #django