Upgrade Django

[wardcr]

After DRF was upgraded, we still need to update Django itself. Initial research was provided by Trevor in issue #28 and the remaining items from there include:

• There are new TestCase enhancements to speed them up by using setUpTestData() instead of setUp(). Code changes needed but existing code will continue to work.
• Check use of Model._meta in case there are deprecated calls.
• GeoJSON native queries in database queries postgis extension is automatically created by migrate so a postgis template database is no longer needed.
• Look into data migrations
• manage.py tests --parallel
• Added the json() method to test client responses to give access to the response body as JSON.
• Update custom commands to use the new argparse system.

[gisjedi]

Things to review:

• Use of check --deploy on production settings
• UUIDField and DurationField for storing UUIDs
• Investigate using setUpTestData for class wide data initialization. May be faster than setUp for TestCase level data initialization.
• Use of data migrations instead of fixtures

Deprecation Compliance:

• Address URL patterns change first deprecated in 1.8 (https://docs.djangoproject.com/en/1.10/releases/1.8/#django-conf-urls-patterns)
• Eliminate string reference to callable view in favor of actual callable
• Update MIDDLEWARE_CLASSES to MIDDLEWARE in settings.py file. (https://docs.djangoproject.com/en/1.10/topics/http/middleware/#upgrading-middleware)
• Update software dependencies to indicate PostGres 9.2 as a minimum supported version in line with Django 1.10 requirement.

[gisjedi]

Issues discovered:

• 'django.utils.log.NullHandler' was an alias, replaced with 'logging.NullHandler'
• Updating to use JSONField is problematic as we as using the PostGres 9.3 JSON string field. If we use Django native PostGres support we will enforce a PostGres 9.4 upgrade and the JSONB field type. djorm-ext-pgjson does not support Django 1.10, so we will need to switch to a supported library (django-pgjson is one such that does not enforce an upgrade to JSONB type field)
• Remove all use of url patterns in favor of simple url tuples
• Replace all option_list with add_argument to argparse use within Django management commands.
• select_related on related models appear to be broken on reverse relationships until Django 1.11. TODOs are used to indicate what should be done during 1.11 upgrade.
• Middleware is not compatible with Django 1.10, upgraded to new style and replaced MIDDLEWARE_CLASSES with MIDDLEWARE list in settings.