Ticket #6110: 6110.diff

django/core/serializers/__init__.py

@@ -53 +53 @@
         _load_serializers()
     return _serializers.keys()
 
+def get_public_serializer_formats():
+    return [f for f in get_serializer_formats() if f != 'python']
+
 def get_deserializer(format):
     if not _serializers:
         _load_serializers()

django/core/management/commands/dumpdata.py

@@ -1 +1 @@
 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 +16 @@
 
     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 +27 @@
 
         # 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 +50 @@
             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 = []

tests/modeltests/fixtures/models.py

@@ -54 +54 @@
 # object list is unaffected
 >>> Article.objects.all()
 [<Article: XML identified as leading cause of cancer>, <Article: Django conquers world!>, <Article: Copyright is fine the way it is>, <Article: Poker on TV is great!>, <Article: Python program becomes self aware>]
+
+# Try to dump the current contents of the database in an unsupported format
+>>> management.call_command('dumpdata', 'fixtures', format='python', verbosity=0)
+Traceback (most recent call last):
+  ...
+SystemExit: 1
+
+# Load a fixture that is not in a supported format
+>>> management.call_command('loaddata', 'fixture4.python', verbosity=0)
+
+# object list is unaffected
+>>> Article.objects.all()
+[<Article: XML identified as leading cause of cancer>, <Article: Django conquers world!>, <Article: Copyright is fine the way it is>, <Article: Poker on TV is great!>, <Article: Python program becomes self aware>]
 """}
 
 # Database flushing does not work on MySQL with the default storage engine