Fixed #25379 -- Removed obsolete information from GeoDjango tutorial.

[fcurella]

ref https://code.djangoproject.com/ticket/25379#ticket

Update GeoDjango tutorial to Postgres 9.1+ and CreateExtension

The GeoDjango tutorial (https://docs.djangoproject.com/en/1.8/ref/contrib/gis/tutorial/) still instructs to create a db using the spatial template.

Since PostgresSQL 9.1, the preferred way is to use the postgis extension instead.

This brings up another issue: should makemigrations automatically add a CreateExtension operation? Is that even doable?

For now I've simply documented it, but it would be very handy to have it automatically.

[timgraham]

It should be done automatically as of Django 1.8 (bac7664). Did you test it?

[fcurella]

I did try on master (0cc0e67), and it does not add the CreateExtension operation. I've checked the output of sqlmigrate and did not contain any CREATE EXTENSION. My database engine is set to 'django.contrib.gis.db.backends.postgis'

[timgraham]

Looking at the implementation, it wouldn't appear in sqlmigrate or add the operation to the migration, but the appropriate SQL should be run when running migrate. Did you see the commit I linked? If you could debug why it's not working (if that's the case), that'd be great.

[fcurella]

I've verified and migrate does indeed create the extension (I can see it with \dx on psql).

I'll amend my commit

[timgraham]

Django 1.9 drops support for PostgreSQL 9.0, so this is obsolete.

[timgraham]

In which case, I'm not sure the special mention about how to create a database in PostgreSQL is needed (given the other databases aren't mentioned). What do you think?

[fcurella]

yeah, I've removed the whole sentence

[fcurella]

While we're here, shuold we suggest Postgres.app under https://github.com/django/django/blob/master/docs/ref/contrib/gis/install/index.txt#L211 ?

[timgraham]

I don't know anything about that (don't use OSX), but I think that section is likely outdated so if you think there are new best practices, I'm sure an update to that section would be welcome. Seems like a separate ticket though.

[timgraham]

merged in dfced09, thanks!