This document discusses database migrations in Django prior to version 1.7 and the new migration features introduced in Django 1.7. Before 1.7, when models changed the database schema had to be manually altered using the database management tool. With 1.7, Django introduced a migrations system to automatically modify the database schema when models change using the commands "python manage.py makemigrations" to register changes and "python manage.py migrate" to apply them without direct database edits. This migration system tracks changes to models over time and allows rolling back/forward through revisions.

1.
Django 1.7 - Something About migrations
By Anish Menon

2. About Me
NAME : Anish Menon
Hobby : Coding , Research on niche concepts , Open sourcing
Open source releases :
Django-Realtime
https://pypi.python.org/pypi/django-realtime
iShout.js
https://www.npmjs.com/package/ishout.js
Social :
facebook : https://www.facebook.com/3am.live
github : https://github.com/anishmenon
Stack overflow : http://stackoverflow.com/users/2127464
Quora : http://www.quora.com/Anish-Menon
CEO & Founder at Cognalys ,Inc. CTO Founder Inzane Technologies PVT.LTD

3. Scenario happened before Django 1.6 :
i was using PosgreSQL and PgAdmin III
First time
from django.db import models
class Poll(models.Model):
question = models.CharField(max_length=200)
pub_date = models.DateTimeField('date published')
class Choice(models.Model):
poll = models.ForeignKey(Poll)
choice_text = models.CharField(max_length=200)
votes = models.IntegerField(default=0)
python manage.py syncdb
Command created the tables according to my above models

4. Second Time
I have added additional Character field ‘description‘ to Poll model
Here
python manage.py syncdb
Will not do anything for me ?
from django.db import models
class Poll(models.Model):
question = models.CharField(max_length=200)
description = models.CharField(max_length=200)
pub_date = models.DateTimeField('date published')
class Choice(models.Model):
poll = models.ForeignKey(Poll)
choice_text = models.CharField(max_length=200)
votes = models.IntegerField(default=0)
I’ve gone to PgAdmin III and added new field , So and so . “EXTRA JOB” .

5. Third Time :
I saw an update on djangoproject.com that it has released Django 1.7 with migrations . So no need
of South integration
pip install django==1.7
python manage.py migrate
This one will modify the db without launching the database management tool ( eg : PgAdmin3 )
or querying Schema .
All operations like :
1 . Create columns / tables
2 . Edit /Delete all Fields
python manage.py makemigrations
This one will register all histories which will help to know the version of changes made to my
models

6. Thank you