Walk through South command output about test-driven-django-development

[alaindomissy]

Prompt:

(tddd)alain@alain-thinkpadw530:~/tddd/myblog$ python manage.py convert_to_south blog
Creating migrations directory at '/home/alain/tddd/myblog/blog/migrations'...
Creating __init__.py in '/home/alain/tddd/myblog/blog/migrations'...
 + Added model blog.Entry
 + Added model blog.Comment
Created 0001_initial.py. You can now apply this migration with: ./manage.py migrate blog
 - Soft matched migration 0001 to 0001_initial.
Running migrations for blog:
 - Migrating forwards to 0001_initial.
 > blog:0001_initial
   (faked)

App 'blog' converted. Note that South assumed the application's models matched the database
(i.e. you haven't changed it since last syncdb); if you have, you should delete the blog/migrations
directory, revert models.py so it matches the database, and try again.
(tddd)alain@alain-thinkpadw530:~/tddd/myblog$ python manage.py migrate --list

 blog
  (*) 0001_initial

(tddd)alain@alain-thinkpadw530:~/tddd/myblog$ python manage.py schemamigration --auto blog
Nothing seems to have changed.
(tddd)alain@alain-thinkpadw530:~/tddd/myblog$ python manage.py schemamigration --auto blog
 ? The field 'Entry.slug' does not have a default specified, yet is NOT NULL.
 ? Since you are adding this field, you MUST specify a default
 ? value to use for existing rows. Would you like to:
 ?  1. Quit now, and add a default to the field in models.py
 ?  2. Specify a one-off value to use for existing columns now
 ? Please select a choice: 

[treyhunner]

We should select option 2 and then use an empty string for a default.

[treyhunner]

We might want to note that to add slugs to existing entries (if this was a live blog with existing entries) we could make a South data migration. We should link to data migrations in the documentation.

[alaindomissy]

 >>> ""
 + Added field slug on blog.Entry
Created 0002_auto__add_field_entry_slug.py. You can now apply this migration with: ./manage.py migrate blog
(tddd)alain@alain-thinkpadw530:~/tddd/myblog$ 

[macro1]

In the interest of keeping the migrations portion brief, I added a default to the slug field to avoid the prompt all together in #139.