This adds some multi-table inheritance to django-denorm

Multi-table inheritance in django-denorm

--- django-denorm/denorm/dependencies.py
+++ django-denorm/denorm/dependencies.py
@@ -260,7 +260,7 @@ class CallbackDependOnRelated(DependOnRelated):
                 model=DirtyInstance,
                 columns=("content_type_id", "object_id"),
                 values=triggers.TriggerNestedSelect(
-                    self.this_model._meta.db_table,
+                    self.this_model._meta.pk.model._meta.db_table,
                     (content_type,
                         self.this_model._meta.pk.get_attname_column()[1]),
                     **{self.field.get_attname_column()[1]: "NEW.%s" % self.other_model._meta.pk.get_attname_column()[1]}
@@ -270,7 +270,7 @@ class CallbackDependOnRelated(DependOnRelated):
                 model=DirtyInstance,
                 columns=("content_type_id", "object_id"),
                 values=triggers.TriggerNestedSelect(
-                    self.this_model._meta.db_table,
+                    self.this_model._meta.pk.model._meta.db_table,
                     (content_type,
                         self.this_model._meta.pk.get_attname_column()[1]),
                     **{self.field.get_attname_column()[1]: "OLD.%s" % self.other_model._meta.pk.get_attname_column()[1]}
@@ -291,17 +291,21 @@ class CallbackDependOnRelated(DependOnRelated):
             action_new = triggers.TriggerActionInsert(
                 model=DirtyInstance,
                 columns=("content_type_id", "object_id"),
-                values=(
-                    content_type,
-                    "NEW.%s" % self.field.get_attname_column()[1],
+                values=triggers.TriggerNestedSelect(
+                    self.field.model._meta.db_table,
+                    (content_type,
+                        self.field.get_attname_column()[1]),
+                    **{self.field.model._meta.pk.get_attname_column()[1]: "NEW.%s" % self.other_model._meta.pk.get_attname_column()[1]}
                 )
             )
             action_old = triggers.TriggerActionInsert(
                 model=DirtyInstance,
                 columns=("content_type_id", "object_id"),
-                values=(
-                    content_type,
-                    "OLD.%s" % self.field.get_attname_column()[1],
+                values=triggers.TriggerNestedSelect(
+                    self.field.model._meta.db_table,
+                    (content_type,
+                        self.field.get_attname_column()[1]),
+                    **{self.field.model._meta.pk.get_attname_column()[1]: "OLD.%s" % self.other_model._meta.pk.get_attname_column()[1]}
                 )
             )
             return [