diff --git a/wordpress/__init__.py b/wordpress/__init__.py
index ae6db5f..7dc04b6 100644
--- a/wordpress/__init__.py
+++ b/wordpress/__init__.py
@@ -1 +1 @@
-__version__ = "0.11.0"
+__version__ = "0.11.1rc"
diff --git a/wordpress/models.py b/wordpress/models.py
index 627323a..400e071 100644
--- a/wordpress/models.py
+++ b/wordpress/models.py
@@ -4,6 +4,7 @@
 from django.conf import settings
 from django.core.exceptions import ObjectDoesNotExist
 from django.db import models
+from django.urls import reverse
 
 
 STATUS_CHOICES = (
@@ -153,7 +154,7 @@ class UserMeta(WordPressModel):
     """
 
     id = models.IntegerField(db_column='umeta_id', primary_key=True)
-    user = models.ForeignKey(User, related_name="meta", db_column='user_id')
+    user = models.ForeignKey(User, related_name="meta", db_column='user_id', on_delete=models.PROTECT)
     key = models.CharField(max_length=255, db_column='meta_key')
     value = models.TextField(db_column='meta_value')
 
@@ -178,7 +179,7 @@ class Link(WordPressModel):
 #    category_id = models.IntegerField(default=0, db_column='link_category')
     description = models.CharField(max_length=255, db_column='link_description')
     visible = models.CharField(max_length=20, db_column='link_visible')
-    owner = models.ForeignKey(User, related_name='links', db_column='link_owner')
+    owner = models.ForeignKey(User, related_name='links', db_column='link_owner', on_delete=models.PROTECT)
     rating = models.IntegerField(default=0, db_column='link_rating')
     updated = models.DateTimeField(blank=True, null=True, db_column='link_updated')
     rel = models.CharField(max_length=255, db_column='link_rel')
@@ -249,8 +250,8 @@ def from_path(self, path):
 
 class TermTaxonomyRelationship(WordPressModel):
 
-    object = models.ForeignKey('Post')
-    term_taxonomy = models.ForeignKey('Taxonomy', related_name='relationships', db_column='term_taxonomy_id')
+    object = models.ForeignKey('Post', on_delete=models.PROTECT)
+    term_taxonomy = models.ForeignKey('Taxonomy', related_name='relationships', db_column='term_taxonomy_id', on_delete=models.PROTECT)
     order = models.IntegerField(db_column='term_order')
 
     class Meta:
@@ -275,7 +276,7 @@ class Post(WordPressModel):
     status = models.CharField(max_length=20, db_column='post_status', choices=POST_STATUS_CHOICES)
     title = models.TextField(db_column='post_title')
     slug = models.SlugField(max_length=200, db_column="post_name")
-    author = models.ForeignKey(User, related_name='posts', db_column='post_author')
+    author = models.ForeignKey(User, related_name='posts', db_column='post_author', on_delete=models.PROTECT)
     excerpt = models.TextField(db_column='post_excerpt')
     content = models.TextField(db_column='post_content')
     content_filtered = models.TextField(db_column='post_content_filtered')
@@ -297,7 +298,7 @@ class Post(WordPressModel):
 
     # other various lame fields
     parent_id = models.IntegerField(default=0, db_column="post_parent")
-    # parent = models.ForeignKey('self', related_name="children", db_column="post_parent", blank=True, null=True)
+    # parent = models.ForeignKey('self', related_name="children", db_column="post_parent", blank=True, null=True, on_delete=models.PROTECT)
     menu_order = models.IntegerField(default=0)
     mime_type = models.CharField(max_length=100, db_column='post_mime_type')
 
@@ -322,9 +323,8 @@ def save(self, **kwargs):
         self.child_cache = None
         self.term_cache = None
 
-    @models.permalink
     def get_absolute_url(self):
-        return ('wp_object_detail', (
+        return reverse('wp_object_detail', args=(
             self.post_date.year,
             "%02i" % self.post_date.month,
             "%02i" % self.post_date.day,
@@ -404,7 +404,7 @@ class PostMeta(WordPressModel):
     """
 
     id = models.IntegerField(db_column='meta_id', primary_key=True)
-    post = models.ForeignKey(Post, related_name='meta', db_column='post_id')
+    post = models.ForeignKey(Post, related_name='meta', db_column='post_id', on_delete=models.PROTECT)
     key = models.CharField(max_length=255, db_column='meta_key')
     value = models.TextField(db_column='meta_value')
 
@@ -422,9 +422,9 @@ class Comment(WordPressModel):
     """
 
     id = models.IntegerField(db_column='comment_id', primary_key=True)
-    post = models.ForeignKey(Post, related_name="comments", db_column="comment_post_id")
+    post = models.ForeignKey(Post, related_name="comments", db_column="comment_post_id", on_delete=models.PROTECT)
     user_id = models.IntegerField(db_column='user_id', default=0)
-    #user = models.ForeignKey(User, related_name="comments", blank=True, null=True, default=0 )
+    #user = models.ForeignKey(User, related_name="comments", blank=True, null=True, default=0 , on_delete=models.PROTECT)
     parent_id = models.IntegerField(default=0, db_column='comment_parent')
 
     # author fields
@@ -484,15 +484,14 @@ class Meta:
     def __unicode__(self):
         return self.name
 
-    @models.permalink
     def get_absolute_url(self):
-        return ('wp_archive_term', (self.slug, ))
+        return reverse('wp_archive_term', args=(self.slug, ))
 
 
 class Taxonomy(WordPressModel):
 
     id = models.IntegerField(db_column='term_taxonomy_id', primary_key=True)
-    term = models.ForeignKey(Term, related_name='taxonomies', blank=True, null=True)
+    term = models.ForeignKey(Term, related_name='taxonomies', blank=True, null=True, on_delete=models.PROTECT)
     #term_id = models.IntegerField()
     name = models.CharField(max_length=32, db_column='taxonomy')
     description = models.TextField()