# documentación de Django - 1.10.7

# Código fuente para django.contrib.gis.db.models.manager

    import warnings

    from django.contrib.gis.db.models.query import GeoQuerySet
    from django.db.models.manager import Manager
    from django.utils.deprecation import RemovedInDjango20Warning

    class GeoManager(Manager.from_queryset(GeoQuerySet)):
        "Overrides Manager to return Geographic QuerySets."

        # This manager should be used for queries on related fields
        # so that geometry columns on Oracle and MySQL are selected
        # properly.
        use_for_related_fields = True

        # No need to bother users with the use_for_related_fields
        # deprecation for this manager which is itself deprecated.
        silence_use_for_related_fields_deprecation = True

        def __init__(self, *args, **kwargs):
            warnings.warn(
                "The GeoManager class is deprecated. Simply use a normal manager "
                "once you have replaced all calls to GeoQuerySet methods by annotations.",
                RemovedInDjango20Warning, stacklevel=2
            )
            super(GeoManager, self).__init__(*args, **kwargs)