newforms-admin: Merged to [4431]

git-svn-id: http://code.djangoproject.com/svn/django/branches/newforms-admin@4432 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/fields/related.py

@@ -615,6 +615,7 @@ class ManyToManyField(RelatedField, Field):
             filter_interface=kwargs.pop('filter_interface', None),
             limit_choices_to=kwargs.pop('limit_choices_to', None),
             symmetrical=kwargs.pop('symmetrical', True))
+        self.db_table = kwargs.pop('db_table', None)
         Field.__init__(self, **kwargs)
 
         msg = gettext_lazy('Hold down "Control", or "Command" on a Mac, to select more than one.')
@@ -629,7 +630,10 @@ class ManyToManyField(RelatedField, Field):
 
     def _get_m2m_db_table(self, opts):
         "Function that can be curried to provide the m2m table name for this relation"
-        return '%s_%s' % (opts.db_table, self.name)
+        if self.db_table:
+            return self.db_table
+        else:
+            return '%s_%s' % (opts.db_table, self.name)
 
     def _get_m2m_column_name(self, related):
         "Function that can be curried to provide the source column name for the m2m table"

django/db/models/query.py

@@ -1,5 +1,6 @@
 from django.db import backend, connection, transaction
 from django.db.models.fields import DateField, FieldDoesNotExist
+from django.db.models.fields.generic import GenericRelation
 from django.db.models import signals
 from django.dispatch import dispatcher
 from django.utils.datastructures import SortedDict
@@ -979,18 +980,26 @@ def delete_objects(seen_objs):
 
         pk_list = [pk for pk,instance in seen_objs[cls]]
         for related in cls._meta.get_all_related_many_to_many_objects():
-            for offset in range(0, len(pk_list), GET_ITERATOR_CHUNK_SIZE):
-                cursor.execute("DELETE FROM %s WHERE %s IN (%s)" % \
-                    (qn(related.field.m2m_db_table()),
-                        qn(related.field.m2m_reverse_name()),
-                        ','.join(['%s' for pk in pk_list[offset:offset+GET_ITERATOR_CHUNK_SIZE]])),
-                    pk_list[offset:offset+GET_ITERATOR_CHUNK_SIZE])
+            if not isinstance(related.field, GenericRelation):
+                for offset in range(0, len(pk_list), GET_ITERATOR_CHUNK_SIZE):
+                    cursor.execute("DELETE FROM %s WHERE %s IN (%s)" % \
+                        (qn(related.field.m2m_db_table()),
+                            qn(related.field.m2m_reverse_name()),
+                            ','.join(['%s' for pk in pk_list[offset:offset+GET_ITERATOR_CHUNK_SIZE]])),
+                        pk_list[offset:offset+GET_ITERATOR_CHUNK_SIZE])
         for f in cls._meta.many_to_many:
+            if isinstance(f, GenericRelation):
+                from django.contrib.contenttypes.models import ContentType 
+                query_extra = 'AND %s=%%s' % f.rel.to._meta.get_field(f.content_type_field_name).column
+                args_extra = [ContentType.objects.get_for_model(cls).id]
+            else:
+                query_extra = ''
+                args_extra = []
             for offset in range(0, len(pk_list), GET_ITERATOR_CHUNK_SIZE):
-                cursor.execute("DELETE FROM %s WHERE %s IN (%s)" % \
+                cursor.execute(("DELETE FROM %s WHERE %s IN (%s)" % \
                     (qn(f.m2m_db_table()), qn(f.m2m_column_name()),
-                    ','.join(['%s' for pk in pk_list[offset:offset+GET_ITERATOR_CHUNK_SIZE]])),
-                    pk_list[offset:offset+GET_ITERATOR_CHUNK_SIZE])
+                    ','.join(['%s' for pk in pk_list[offset:offset+GET_ITERATOR_CHUNK_SIZE]]))) + query_extra,
+                    pk_list[offset:offset+GET_ITERATOR_CHUNK_SIZE] + args_extra)
         for field in cls._meta.fields:
             if field.rel and field.null and field.rel.to in seen_objs:
                 for offset in range(0, len(pk_list), GET_ITERATOR_CHUNK_SIZE):

docs/model-api.txt

@@ -874,6 +874,10 @@ the relationship should work. All are optional:
                              force Django to add the descriptor for the reverse
                              relationship, allowing ``ManyToMany`` relationships to be
                              non-symmetrical.
+			     
+    ``db_table``             The name of the table to create for storing the many-to-many 
+                             data. If this is not provided, Django will assume a default
+                             name based upon the names of the two tables being joined.
 
     =======================  ============================================================
 

tests/modeltests/custom_columns/models.py

@@ -1,53 +1,105 @@
 """
-17. Custom column names
+17. Custom column/table names
 
 If your database column name is different than your model attribute, use the
 ``db_column`` parameter. Note that you'll use the field's name, not its column
 name, in API usage.
+
+If your database table name is different than your model name, use the
+``db_table`` Meta attribute. This has no effect on the API used to 
+query the database.
+
+If you need to use a table name for a many-to-many relationship that differs 
+from the default generated name, use the ``db_table`` parameter on the 
+ManyToMany field. This has no effect on the API for querying the database.
+
 """
 
 from django.db import models
 
-class Person(models.Model):
+class Author(models.Model):
     first_name = models.CharField(maxlength=30, db_column='firstname')
     last_name = models.CharField(maxlength=30, db_column='last')
 
     def __str__(self):
         return '%s %s' % (self.first_name, self.last_name)
 
-__test__ = {'API_TESTS':"""
-# Create a Person.
->>> p = Person(first_name='John', last_name='Smith')
->>> p.save()
+    class Meta:
+        db_table = 'my_author_table'
+        ordering = ('last_name','first_name')
 
->>> p.id
+class Article(models.Model):
+    headline = models.CharField(maxlength=100)
+    authors = models.ManyToManyField(Author, db_table='my_m2m_table')
+
+    def __str__(self):
+        return self.headline
+
+    class Meta:
+        ordering = ('headline',)
+        
+__test__ = {'API_TESTS':"""
+# Create a Author.
+>>> a = Author(first_name='John', last_name='Smith')
+>>> a.save()
+
+>>> a.id
 1
 
->>> Person.objects.all()
-[<Person: John Smith>]
+# Create another author
+>>> a2 = Author(first_name='Peter', last_name='Jones')
+>>> a2.save()
 
->>> Person.objects.filter(first_name__exact='John')
-[<Person: John Smith>]
+# Create an article
+>>> art = Article(headline='Django lets you build web apps easily')
+>>> art.save()
+>>> art.authors = [a, a2]
 
->>> Person.objects.get(first_name__exact='John')
-<Person: John Smith>
+# Although the table and column names on Author have been set to 
+# custom values, nothing about using the Author model has changed...
 
->>> Person.objects.filter(firstname__exact='John')
+# Query the available authors
+>>> Author.objects.all()
+[<Author: Peter Jones>, <Author: John Smith>]
+
+>>> Author.objects.filter(first_name__exact='John')
+[<Author: John Smith>]
+
+>>> Author.objects.get(first_name__exact='John')
+<Author: John Smith>
+
+>>> Author.objects.filter(firstname__exact='John')
 Traceback (most recent call last):
     ...
 TypeError: Cannot resolve keyword 'firstname' into field
 
->>> p = Person.objects.get(last_name__exact='Smith')
->>> p.first_name
+>>> a = Author.objects.get(last_name__exact='Smith')
+>>> a.first_name
 'John'
->>> p.last_name
+>>> a.last_name
 'Smith'
->>> p.firstname
+>>> a.firstname
 Traceback (most recent call last):
     ...
-AttributeError: 'Person' object has no attribute 'firstname'
->>> p.last
+AttributeError: 'Author' object has no attribute 'firstname'
+>>> a.last
 Traceback (most recent call last):
     ...
-AttributeError: 'Person' object has no attribute 'last'
+AttributeError: 'Author' object has no attribute 'last'
+
+# Although the Article table uses a custom m2m table, 
+# nothing about using the m2m relationship has changed...
+
+# Get all the authors for an article
+>>> art.authors.all()
+[<Author: Peter Jones>, <Author: John Smith>]
+
+# Get the articles for an author
+>>> a.article_set.all()
+[<Article: Django lets you build web apps easily>]
+
+# Query the authors across the m2m relation
+>>> art.authors.filter(last_name='Jones')
+[<Author: Peter Jones>]
+
 """}

tests/modeltests/generic_relations/models.py

@@ -65,14 +65,14 @@ __test__ = {'API_TESTS':"""
 
 # Objects with declared GenericRelations can be tagged directly -- the API
 # mimics the many-to-many API.
->>> lion.tags.create(tag="yellow")
-<TaggedItem: yellow>
->>> lion.tags.create(tag="hairy")
-<TaggedItem: hairy>
 >>> bacon.tags.create(tag="fatty")
 <TaggedItem: fatty>
 >>> bacon.tags.create(tag="salty")
 <TaggedItem: salty>
+>>> lion.tags.create(tag="yellow")
+<TaggedItem: yellow>
+>>> lion.tags.create(tag="hairy")
+<TaggedItem: hairy>
 
 >>> lion.tags.all()
 [<TaggedItem: hairy>, <TaggedItem: yellow>]
@@ -105,4 +105,30 @@ __test__ = {'API_TESTS':"""
 [<TaggedItem: shiny>]
 >>> TaggedItem.objects.filter(content_type__pk=ctype.id, object_id=quartz.id)
 [<TaggedItem: clearish>]
+
+# If you delete an object with an explicit Generic relation, the related
+# objects are deleted when the source object is deleted.
+# Original list of tags:
+>>> [(t.tag, t.content_type, t.object_id) for t in TaggedItem.objects.all()]
+[('clearish', <ContentType: mineral>, 1), ('fatty', <ContentType: vegetable>, 2), ('hairy', <ContentType: animal>, 1), ('salty', <ContentType: vegetable>, 2), ('shiny', <ContentType: animal>, 2), ('yellow', <ContentType: animal>, 1)]
+
+>>> lion.delete()
+>>> [(t.tag, t.content_type, t.object_id) for t in TaggedItem.objects.all()]
+[('clearish', <ContentType: mineral>, 1), ('fatty', <ContentType: vegetable>, 2), ('salty', <ContentType: vegetable>, 2), ('shiny', <ContentType: animal>, 2)]
+
+# If Generic Relation is not explicitly defined, any related objects 
+# remain after deletion of the source object.
+>>> quartz.delete()
+>>> [(t.tag, t.content_type, t.object_id) for t in TaggedItem.objects.all()]
+[('clearish', <ContentType: mineral>, 1), ('fatty', <ContentType: vegetable>, 2), ('salty', <ContentType: vegetable>, 2), ('shiny', <ContentType: animal>, 2)]
+
+# If you delete a tag, the objects using the tag are unaffected 
+# (other than losing a tag)
+>>> tag = TaggedItem.objects.get(id=1)
+>>> tag.delete()
+>>> bacon.tags.all()
+[<TaggedItem: salty>]
+>>> [(t.tag, t.content_type, t.object_id) for t in TaggedItem.objects.all()]
+[('clearish', <ContentType: mineral>, 1), ('salty', <ContentType: vegetable>, 2), ('shiny', <ContentType: animal>, 2)]
+
 """}