1.6 regression: Can't load fixtures from subdir

[Jonas H.]

Consider this fixture directory (added to FIXTURE_DIRS):

- fixtures/
  + initial_data.json
  + tests/
    - initial_data_inner.json

Loading the outer fixture works:

$ ./manage.py loaddata initial_data
Installed 3 object(s) from 1 fixture(s)

The inner does not:

$ ./manage.py loaddata initial_data_inner
…site-packages/django/core/management/commands/loaddata.py:218: UserWarning: No fixture named 'initial_data_inner' found.
  warnings.warn("No fixture named '%s' found." % fixture_name)

Installed 0 object(s) from 0 fixture(s)

$ ./manage.py loaddata tests/initial_data_inner
…site-packages/django/core/management/commands/loaddata.py:218: UserWarning: No fixture named 'initial_data_inner' found.
  warnings.warn("No fixture named '%s' found." % fixture_name)

Installed 0 object(s) from 0 fixture(s)

This used to work in Django 1.5.

The cause of this is that all fixture names that contain an os.path.sep are considered absolute paths in the loaddata management command.

[Aymeric Augustin]

Marking as a release blocker since it's a regression.

[Claude Paroz]

​https://github.com/django/django/pull/2036
This issue is partially related to #20933.

[Claude Paroz <claude@…>]

In 41ebc4838d2b09e7f3ece8889e21492902b55dc8:

Fixed #21551 -- Reenabled loading fixtures from subdirectory

This was a regression in Django 1.6 that was only partially
restored in 839940f27f.
Thanks Jonas Haag for the report.

[Claude Paroz <claude@…>]

In 45c0d2e1ce0fe024e4a80c9dde8263f5ff59d577:

[1.6.x] Fixed #21551 -- Reenabled loading fixtures from subdirectory

This was a regression in Django 1.6 that was only partially
restored in 839940f27f.
Thanks Jonas Haag for the report.
Backport of 41ebc4838d from master.