Fixed #4667 -- Added support for inline generic relations in the admin. Thanks to Honza Král and Alex Gaynor for their work on this ticket.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8279 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/admin/options.py

@@ -132,7 +132,7 @@ class BaseModelAdmin(object):
 
         If kwargs are given, they're passed to the form Field's constructor.
         """
-
+        
         # If the field specifies choices, we don't need to look for special
         # admin widgets - we just need to use a select widget of some kind.
         if db_field.choices:

django/contrib/contenttypes/generic.py

@@ -6,10 +6,15 @@ from django import oldforms
 from django.core.exceptions import ObjectDoesNotExist
 from django.db import connection
 from django.db.models import signals
+from django.db import models
 from django.db.models.fields.related import RelatedField, Field, ManyToManyRel
 from django.db.models.loading import get_model
 from django.utils.functional import curry
 
+from django.forms import ModelForm
+from django.forms.models import BaseModelFormSet, modelformset_factory, save_instance
+from django.contrib.admin.options import InlineModelAdmin, flatten_fieldsets
+
 class GenericForeignKey(object):
     """
     Provides a generic relation to any object through content-type/object-id
@@ -273,13 +278,111 @@ def create_generic_related_manager(superclass):
 class GenericRel(ManyToManyRel):
     def __init__(self, to, related_name=None, limit_choices_to=None, symmetrical=True):
         self.to = to
-        self.num_in_admin = 0
         self.related_name = related_name
-        self.filter_interface = None
         self.limit_choices_to = limit_choices_to or {}
         self.edit_inline = False
-        self.raw_id_admin = False
         self.symmetrical = symmetrical
         self.multiple = True
-        assert not (self.raw_id_admin and self.filter_interface), \
+
-            "Generic relations may not use both raw_id_admin and filter_interface"
+class BaseGenericInlineFormSet(BaseModelFormSet):
+    """
+    A formset for generic inline objects to a parent.
+    """
+    ct_field_name = "content_type"
+    ct_fk_field_name = "object_id"
+    
+    def __init__(self, data=None, files=None, instance=None, save_as_new=None):
+        opts = self.model._meta
+        self.instance = instance
+        self.rel_name = '-'.join((
+            opts.app_label, opts.object_name.lower(),
+            self.ct_field.name, self.ct_fk_field.name,
+        ))
+        super(BaseGenericInlineFormSet, self).__init__(
+            queryset=self.get_queryset(), data=data, files=files,
+            prefix=self.rel_name
+        )
+
+    def get_queryset(self):
+        # Avoid a circular import.
+        from django.contrib.contenttypes.models import ContentType
+        if self.instance is None:
+            return self.model._default_manager.empty()
+        return self.model._default_manager.filter(**{
+            self.ct_field.name: ContentType.objects.get_for_model(self.instance),
+            self.ct_fk_field.name: self.instance.pk,
+        })
+
+    def save_new(self, form, commit=True):
+        # Avoid a circular import.
+        from django.contrib.contenttypes.models import ContentType
+        kwargs = {
+            self.ct_field.get_attname(): ContentType.objects.get_for_model(self.instance).pk,
+            self.ct_fk_field.get_attname(): self.instance.pk,
+        }
+        new_obj = self.model(**kwargs)
+        return save_instance(form, new_obj, commit=commit)
+
+def generic_inlineformset_factory(model, form=ModelForm,
+                                  formset=BaseGenericInlineFormSet,
+                                  ct_field="content_type", fk_field="object_id",
+                                  fields=None, exclude=None,
+                                  extra=3, can_order=False, can_delete=True,
+                                  max_num=0,
+                                  formfield_callback=lambda f: f.formfield()):
+    """
+    Returns an ``GenericInlineFormSet`` for the given kwargs.
+
+    You must provide ``ct_field`` and ``object_id`` if they different from the
+    defaults ``content_type`` and ``object_id`` respectively.
+    """
+    opts = model._meta
+    # Avoid a circular import.
+    from django.contrib.contenttypes.models import ContentType
+    # if there is no field called `ct_field` let the exception propagate
+    ct_field = opts.get_field(ct_field)
+    if not isinstance(ct_field, models.ForeignKey) or ct_field.rel.to != ContentType:
+        raise Exception("fk_name '%s' is not a ForeignKey to ContentType" % ct_field)
+    fk_field = opts.get_field(fk_field) # let the exception propagate
+    if exclude is not None:
+        exclude.extend([ct_field.name, fk_field.name])
+    else:
+        exclude = [ct_field.name, fk_field.name]
+    FormSet = modelformset_factory(model, form=form,
+                                   formfield_callback=formfield_callback,
+                                   formset=formset,
+                                   extra=extra, can_delete=can_delete, can_order=can_order,
+                                   fields=fields, exclude=exclude, max_num=max_num)
+    FormSet.ct_field = ct_field
+    FormSet.ct_fk_field = fk_field
+    return FormSet
+
+class GenericInlineModelAdmin(InlineModelAdmin):
+    ct_field = "content_type"
+    ct_fk_field = "object_id"
+    formset = BaseGenericInlineFormSet
+
+    def get_formset(self, request, obj=None):
+        if self.declared_fieldsets:
+            fields = flatten_fieldsets(self.declared_fieldsets)
+        else:
+            fields = None
+        defaults = {
+            "ct_field": self.ct_field,
+            "fk_field": self.ct_fk_field,
+            "form": self.form,
+            "formfield_callback": self.formfield_for_dbfield,
+            "formset": self.formset,
+            "extra": self.extra,
+            "can_delete": True,
+            "can_order": False,
+            "fields": fields,
+        }
+        return generic_inlineformset_factory(self.model, **defaults)
+
+class GenericStackedInline(GenericInlineModelAdmin):
+    template = 'admin/edit_inline/stacked.html'
+
+class GenericTabularInline(GenericInlineModelAdmin):
+    template = 'admin/edit_inline/tabular.html'
+

docs/admin.txt

@@ -785,6 +785,47 @@ Finally, register your ``Person`` and ``Group`` models with the admin site::
 Now your admin site is set up to edit ``Membership`` objects inline from
 either the ``Person`` or the ``Group`` detail pages.
 
+Using generic relations as an inline
+------------------------------------
+
+It is possible to use an inline with generically related objects. Let's say
+you have the following models::
+
+    class Image(models.Model):
+        image = models.ImageField(upload_to="images")
+        content_type = models.ForeignKey(ContentType)
+        object_id = models.PositiveIntegerField()
+        content_object = generic.GenericForeignKey("content_type", "object_id")
+    
+    class Product(models.Model):
+        name = models.CharField(max_length=100)
+
+If you want to allow editing and creating ``Image`` instance on the ``Product``
+add/change views you can simply use ``GenericInlineModelAdmin`` provided by
+``django.contrib.contenttypes.generic``. In your ``admin.py`` for this
+example app::
+
+    from django.contrib import admin
+    from django.contrib.contenttypes import generic
+    
+    from myproject.myapp.models import Image, Product
+    
+    class ImageInline(generic.GenericTabularInline):
+        model = Image
+    
+    class ProductAdmin(admin.ModelAdmin):
+        inlines = [
+            ImageInline,
+        ]
+    
+    admin.site.register(Product, ProductAdmin)
+
+``django.contrib.contenttypes.generic`` provides both a ``GenericTabularInline``
+and ``GenericStackedInline`` and behave just like any other inline. See the
+`contenttypes documentation`_ for more specific information.
+
+.. _contenttypes documentation: ../contenttypes/
+
 ``AdminSite`` objects
 =====================
 

docs/contenttypes.txt

@@ -72,11 +72,11 @@ together, uniquely describe an installed model:
         `the verbose_name attribute`_ of the model.
 
 Let's look at an example to see how this works. If you already have
-the contenttypes application installed, and then add `the sites
+the contenttypes application installed, and then add `the sites application`_
-application`_ to your ``INSTALLED_APPS`` setting and run ``manage.py
+to your ``INSTALLED_APPS`` setting and run ``manage.py syncdb`` to install it,
-syncdb`` to install it, the model ``django.contrib.sites.models.Site``
+the model ``django.contrib.sites.models.Site`` will be installed into your
-will be installed into your database. Along with it a new instance
+database. Along with it a new instance of ``ContentType`` will be created with
-of ``ContentType`` will be created with the following values:
+the following values:
 
     * ``app_label`` will be set to ``'sites'`` (the last part of the Python
       path "django.contrib.sites").
@@ -261,3 +261,27 @@ Note that if you delete an object that has a ``GenericRelation``, any objects
 which have a ``GenericForeignKey`` pointing at it will be deleted as well. In
 the example above, this means that if a ``Bookmark`` object were deleted, any
 ``TaggedItem`` objects pointing at it would be deleted at the same time.
+
+Generic relations in forms and admin
+------------------------------------
+
+``django.contrib.contenttypes.genric`` provides both a ``GenericInlineFormSet``
+and ``GenericInlineModelAdmin``. This enables the use of generic relations in
+forms and the admin. See the `model formset`_ and `admin`_ documentation for
+more information.
+
+``GenericInlineModelAdmin`` options
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The ``GenericInlineModelAdmin`` class inherits all properties from an
+``InlineModelAdmin`` class. However, it adds a couple of its own for working
+with the generic relation:
+
+    * ``ct_field`` - The name of the ``ContentType`` foreign key field on the
+      model. Defaults to ``content_type``.
+    
+    * ``ct_fk_field`` - The name of the integer field that represents the ID
+      of the related object. Defaults to ``object_id``.
+
+.. _model formset: ../modelforms/
+.. _admin: ../admin/

tests/modeltests/generic_relations/models.py

@@ -191,4 +191,24 @@ __test__ = {'API_TESTS':"""
 >>> cheetah.delete()
 >>> Comparison.objects.all()
 [<Comparison: tiger is stronger than None>]
+
+# GenericInlineFormSet tests ##################################################
+
+>>> from django.contrib.contenttypes.generic import generic_inlineformset_factory
+
+>>> GenericFormSet = generic_inlineformset_factory(TaggedItem, extra=1)
+>>> formset = GenericFormSet(instance=Animal())
+>>> for form in formset.forms:
+...     print form.as_p()
+<p><label for="id_generic_relations-taggeditem-content_type-object_id-0-tag">Tag:</label> <input id="id_generic_relations-taggeditem-content_type-object_id-0-tag" type="text" name="generic_relations-taggeditem-content_type-object_id-0-tag" maxlength="50" /></p>
+<p><label for="id_generic_relations-taggeditem-content_type-object_id-0-DELETE">Delete:</label> <input type="checkbox" name="generic_relations-taggeditem-content_type-object_id-0-DELETE" id="id_generic_relations-taggeditem-content_type-object_id-0-DELETE" /><input type="hidden" name="generic_relations-taggeditem-content_type-object_id-0-id" id="id_generic_relations-taggeditem-content_type-object_id-0-id" /></p>
+
+>>> formset = GenericFormSet(instance=platypus)
+>>> for form in formset.forms:
+...     print form.as_p()
+<p><label for="id_generic_relations-taggeditem-content_type-object_id-0-tag">Tag:</label> <input id="id_generic_relations-taggeditem-content_type-object_id-0-tag" type="text" name="generic_relations-taggeditem-content_type-object_id-0-tag" value="shiny" maxlength="50" /></p>
+<p><label for="id_generic_relations-taggeditem-content_type-object_id-0-DELETE">Delete:</label> <input type="checkbox" name="generic_relations-taggeditem-content_type-object_id-0-DELETE" id="id_generic_relations-taggeditem-content_type-object_id-0-DELETE" /><input type="hidden" name="generic_relations-taggeditem-content_type-object_id-0-id" value="5" id="id_generic_relations-taggeditem-content_type-object_id-0-id" /></p>
+<p><label for="id_generic_relations-taggeditem-content_type-object_id-1-tag">Tag:</label> <input id="id_generic_relations-taggeditem-content_type-object_id-1-tag" type="text" name="generic_relations-taggeditem-content_type-object_id-1-tag" maxlength="50" /></p>
+<p><label for="id_generic_relations-taggeditem-content_type-object_id-1-DELETE">Delete:</label> <input type="checkbox" name="generic_relations-taggeditem-content_type-object_id-1-DELETE" id="id_generic_relations-taggeditem-content_type-object_id-1-DELETE" /><input type="hidden" name="generic_relations-taggeditem-content_type-object_id-1-id" id="id_generic_relations-taggeditem-content_type-object_id-1-id" /></p>
+
 """}