Fixed #13030 -- Corrected natural key deserialization to subclasses. Thanks to yishaibeeri for the report and test case.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12804 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/serializers/python.py

@@ -111,6 +111,10 @@ def Deserializer(object_list, **options):
                         if hasattr(field_value, '__iter__'):
                             obj = field.rel.to._default_manager.db_manager(db).get_by_natural_key(*field_value)
                             value = getattr(obj, field.rel.field_name)
+                            # If this is a natural foreign key to an object that
+                            # has a FK/O2O as the foreign key, use the FK value
+                            if field.rel.to._meta.pk.rel:
+                                value = value.pk
                         else:
                             value = field.rel.to._meta.get_field(field.rel.field_name).to_python(field_value)
                         data[field.attname] = value

django/core/serializers/xml_serializer.py

@@ -221,6 +221,10 @@ class Deserializer(base.Deserializer):
                     field_value = [getInnerText(k).strip() for k in keys]
                     obj = field.rel.to._default_manager.db_manager(self.db).get_by_natural_key(*field_value)
                     obj_pk = getattr(obj, field.rel.field_name)
+                    # If this is a natural foreign key to an object that
+                    # has a FK/O2O as the foreign key, use the FK value
+                    if field.rel.to._meta.pk.rel:
+                        obj_pk = obj_pk.pk
                 else:
                     # Otherwise, treat like a normal PK
                     field_value = getInnerText(node).strip()

tests/regressiontests/fixtures_regress/fixtures/nk-inheritance.json

@@ -0,0 +1,18 @@
+[
+    {
+        "pk": 1,
+        "model": "fixtures_regress.nkchild",
+        "fields": {
+            "data": "apple"
+        }
+    },
+    {
+        "pk": 1,
+        "model": "fixtures_regress.reftonkchild",
+        "fields": {
+            "text": "my text",
+            "nk_fk" : ["apple"],
+            "nk_m2m": [["apple"]]
+        }
+    }
+]

tests/regressiontests/fixtures_regress/fixtures/nk-inheritance2.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<django-objects version="1.0">
+    <object pk="2" model="fixtures_regress.parent">
+        <field type="CharField" name="name">james</field>
+    </object>
+    <object pk="2" model="fixtures_regress.nkchild">
+        <field type="CharField" name="data">banana</field>
+    </object>
+    <object pk="2" model="fixtures_regress.reftonkchild">
+        <field type="CharField" name="text">other text</field>
+        <field to="fixtures_regress.nkchild" name="nk_fk" rel="ManyToOneRel">
+            <natural>apple</natural>
+        </field>
+        <field to="fixtures_regress.nkchild" name="nk_m2m" rel="ManyToManyRel">
+            <object>
+                <natural>banana</natural>
+            </object>
+            <object>
+                <natural>apple</natural>
+            </object>
+        </field>
+    </object>
+</django-objects>

tests/regressiontests/fixtures_regress/models.py

@@ -52,6 +52,9 @@ class Absolute(models.Model):
 class Parent(models.Model):
     name = models.CharField(max_length=10)
 
+    class Meta:
+        ordering = ('id',)
+
 class Child(Parent):
     data = models.CharField(max_length=10)
 
@@ -130,6 +133,32 @@ class Book(models.Model):
             ', '.join(s.name for s in self.stores.all())
         )
 
+class NKManager(models.Manager):
+    def get_by_natural_key(self, data):
+        return self.get(data=data)
+
+class NKChild(Parent):
+    data = models.CharField(max_length=10, unique=True)
+    objects = NKManager()
+
+    def natural_key(self):
+        return self.data
+
+    def __unicode__(self):
+        return u'NKChild %s:%s' % (self.name, self.data)
+
+class RefToNKChild(models.Model):
+    text = models.CharField(max_length=10)
+    nk_fk = models.ForeignKey(NKChild, related_name='ref_fks')
+    nk_m2m = models.ManyToManyField(NKChild, related_name='ref_m2ms')
+
+    def __unicode__(self):
+        return u'%s: Reference to %s [%s]' % (
+            self.text,
+            self.nk_fk,
+            ', '.join(str(o) for o in self.nk_m2m.all())
+        )
+
 # ome models with pathological circular dependencies
 class Circle1(models.Model):
     name = models.CharField(max_length=255)
@@ -244,6 +273,27 @@ No fixture data found for 'bad_fixture2'. (File format may be invalid.)
 
 >>> management.call_command('loaddata', 'model-inheritance.json', verbosity=0)
 
+###############################################
+# Test for ticket #13030 -- natural keys deserialize with fk to inheriting model
+
+# load data with natural keys
+>>> management.call_command('loaddata', 'nk-inheritance.json', verbosity=0)
+
+>>> NKChild.objects.get(pk=1)
+<NKChild: NKChild fred:apple>
+
+>>> RefToNKChild.objects.get(pk=1)
+<RefToNKChild: my text: Reference to NKChild fred:apple [NKChild fred:apple]>
+
+# ... and again in XML
+>>> management.call_command('loaddata', 'nk-inheritance2.xml', verbosity=0)
+
+>>> NKChild.objects.get(pk=2)
+<NKChild: NKChild james:banana>
+
+>>> RefToNKChild.objects.get(pk=2)
+<RefToNKChild: other text: Reference to NKChild fred:apple [NKChild fred:apple, NKChild james:banana]>
+
 ###############################################
 # Test for ticket #7572 -- MySQL has a problem if the same connection is
 # used to create tables, load data, and then query over that data.