django.contrib.gis.utils.srs is out of date

[Charlie DeTar]

django.contrib.gis.utils.srs.add_postgis_srs fails with the following error:

ImportError                               Traceback (most recent call last)
/usr/local/lib/python2.6/dist-packages/django/contrib/gis/utils/srs.pyc in add_postgis_srs(srs, auth_name, auth_srid, ref_sys_name)
     22                    determined by GDAL.
     23     """
---> 24     from django.contrib.gis.db.backend import SpatialBackend
     25     from django.contrib.gis.models import SpatialRefSys
     26     from django.contrib.gis.gdal import SpatialReference

ImportError: No module named backend

This is because the django.contrib.gis.db.backend module no longer exists (it has been renamed "backends"), and the SpatialBackend class is no longer defined.

Thus the following instructions in geodjango documentation fail:
​http://geodjango.org/docs/install.html#add-google-projection-to-spatial-ref-sys-table

[jbronn]

(In [12228]) Fixed #12591 -- Renamed add_postgis_srs to add_srs_entry (keeping backwards-compatible alias), added database keyword for multi-db, removed deprecated SpatialBackend references; no longer use get_or_create and look for existing entry based on SRID value.