Migrations: Whatwhyhowwho?

A talk I gave at EuroDjangoCon 2009.

Transcript

1. Migrations:
   whatwhyhowwho?
   http://www.flickr.com/photos/moonjazz/1216783552/
   

   View Slide

2. I'm�Andrew.
   @andrewgodwin
   http://aeracode.org
   

   View Slide

3. mi·gra·tion
   whatwhyhowwho?
   1.�noun
   A�way�to�keep�your�sanity�when
   changing�model�definitions.
   See�also:�Schema�Evolution
   

   View Slide

4. whatwhyhowwho?
   class Pony(models.Model ):
   name = models.CharField(max_length=100)
   height = models.IntegerField()
   class Pony(models.Model ):
   name = models.CharField(max_length=100)
   height = models.FloatField()
   born = models.DateField()
   

   View Slide

5. whatwhyhowwho?
   django.contrib.migrations
   

   View Slide

6. whatwhyhowwho?
   south
   migratory
   yadsel
   django-evolution
   dmigrations
   deseb
   schema-evolution
   

   View Slide

7. whatwhyhowwho?
   south
   migratory
   yadsel
   django-evolution
   dmigrations
   deseb
   schema-evolution
   

   View Slide

8. whatwhyhowwho?
   django-evolution
   ·�1½�years�old
   ·�uses�syncdb�initially
   ·�support�automatic�'hinting'
   

   View Slide

9. whatwhyhowwho?
   dmigrations
   ·�8�months�old
   ·�uses�migrations�from�start
   ·�MySQL�only
   ·�migrations�are�project-wide
   

   View Slide

10. whatwhyhowwho?
    south
    ·�8�months�old
    ·�uses�migrations�from�start
    ·�supports�'autodetection'
    ·�migrations�are�per-app
    ·�mine
    

    View Slide

11. whatwhyhowwho?
    south
    django-evolution
    vs
    

    View Slide

12. whatwhyhowwho?
    why?
    why?
    

    View Slide

13. whatwhyhowwho?
    south django-evolution
    1.�install
    3.�make�initial
    �����migration
    4.�migrate�to�initial
    2.�syncdb
    1.�install
    2.�syncdb
    

    View Slide

14. whatwhyhowwho?
    south django-evolution
    1.�install
    3.�make�initial
    �����migration
    4.�migrate�to�initial
    2.�syncdb
    1.�install
    2.�syncdb
    

    View Slide

15. whatwhyhowwho?
    live�demo
    Ponies!
    South!
    django-evolution!
    

    View Slide

16. whatwhyhowwho?
    the
    f�u�t�u�r�e
    

    View Slide

17. whatwhyhowwho?
    http://code.djangoproject.com/wiki/SchemaEvolution
    http://south.aeracode.org
    http://code.google.com/p/django-evolution/
    

    View Slide

18. whatwhyhowwho?
    Thanks.
    Andrew�Godwin
    http://aeracode.org
    @andrewgodwin
    

    View Slide