Fixed #6110 -- Mark the python format serializer as for internal use only. Thanks, empty.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6922 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/management/commands/dumpdata.py

@@ -1,11 +1,13 @@
 from django.core.management.base import BaseCommand, CommandError
+from django.core import serializers
 
 from optparse import make_option
 
 class Command(BaseCommand):
+    serializer_formats = serializers.get_public_serializer_formats()
     option_list = BaseCommand.option_list + (
         make_option('--format', default='json', dest='format',
-            help='Specifies the output serialization format for fixtures'),
+            help='Specifies the output serialization format for fixtures.  Formats available: %s' % serializer_formats),
         make_option('--indent', default=None, dest='indent', type='int',
             help='Specifies the indent level to use when pretty-printing output'),
     )
@@ -14,7 +16,6 @@ class Command(BaseCommand):
 
     def handle(self, *app_labels, **options):
         from django.db.models import get_app, get_apps, get_models
-        from django.core import serializers
 
         format = options.get('format', 'json')
         indent = options.get('indent', None)
@@ -26,6 +27,9 @@ class Command(BaseCommand):
 
         # Check that the serialization format exists; this is a shortcut to
         # avoid collating all the objects and _then_ failing.
+        if format not in self.serializer_formats:
+            raise CommandError("Unknown serialization format: %s" % format)
+
         try:
             serializers.get_serializer(format)
         except KeyError:

django/core/management/commands/loaddata.py

@@ -50,10 +50,10 @@ class Command(BaseCommand):
             parts = fixture_label.split('.')
             if len(parts) == 1:
                 fixture_name = fixture_label
-                formats = serializers.get_serializer_formats()
+                formats = serializers.get_public_serializer_formats()
             else:
                 fixture_name, format = '.'.join(parts[:-1]), parts[-1]
-                if format in serializers.get_serializer_formats():
+                if format in serializers.get_public_serializer_formats():
                     formats = [format]
                 else:
                     formats = []

django/core/serializers/__init__.py

@@ -53,6 +53,11 @@ def get_serializer_formats():
         _load_serializers()
     return _serializers.keys()
 
+def get_public_serializer_formats():
+    if not _serializers:
+        _load_serializers()
+    return [k for k, v in _serializers.iteritems() if not v.Serializer.internal_use_only]
+
 def get_deserializer(format):
     if not _serializers:
         _load_serializers()

django/core/serializers/base.py

@@ -22,6 +22,10 @@ class Serializer(object):
     Abstract serializer base class.
     """
 
+    # Indicates if the implemented serializer is only available for 
+    # internal Django use.
+    internal_use_only = False
+    
     def serialize(self, queryset, **options):
         """
         Serialize a queryset.

django/core/serializers/json.py

@@ -20,6 +20,8 @@ class Serializer(PythonSerializer):
     """
     Convert a queryset to JSON.
     """
+    internal_use_only = False
+    
     def end_serialization(self):
         self.options.pop('stream', None)
         self.options.pop('fields', None)

django/core/serializers/python.py

@@ -13,7 +13,9 @@ class Serializer(base.Serializer):
     """
     Serializes a QuerySet to basic Python objects.
     """
-
+    
+    internal_use_only = True
+    
     def start_serialization(self):
         self._current = None
         self.objects = []

django/core/serializers/pyyaml.py

@@ -19,6 +19,8 @@ class Serializer(PythonSerializer):
     Convert a queryset to YAML.
     """
     
+    internal_use_only = False
+    
     def handle_field(self, obj, field):
         # A nasty special case: base YAML doesn't support serialization of time
         # types (as opposed to dates or datetimes, which it does support). Since