Change codebase to query or create correct User model

The code base had many references to User.username and other
specific to LocalUser attributes as that was the way it use to exist.
This updates those to query on the generic User model but filtering
by attributes on the LocalUser.

mediagoblin/media_types/blog/views.py

@@ -46,7 +46,7 @@ from mediagoblin.tools.text import (
     cleaned_markdown_conversion)
 
 from mediagoblin.db.util import check_media_slug_used, check_collection_slug_used
-from mediagoblin.db.models import User, Collection, MediaEntry
+from mediagoblin.db.models import User, Collection, MediaEntry, LocalUser
 
 from mediagoblin.notifications import add_comment_subscription
 
@@ -306,7 +306,9 @@ def blog_delete(request, **kwargs):
     Deletes a blog and media entries, tags associated with it. 
     """
     url_user = request.matchdict.get('user')
-    owner_user = request.db.User.query.filter_by(username=url_user).first()
+    owner_user = request.db.User.query.filter(
+        LocalUser.username==url_user
+    ).first()
 
     blog_slug = request.matchdict.get('blog_slug', None)
     blog = get_blog_by_slug(request, blog_slug, author=owner_user.id)
@@ -355,7 +357,9 @@ def blog_about_view(request):
     blog_slug = request.matchdict.get('blog_slug', None)
     url_user = request.matchdict.get('user', None)
     
-    user = request.db.User.query.filter_by(username=url_user).first() 
+    user = request.db.User.query.filter(
+        LocalUser.username=url_user
+    ).first() 
     blog = get_blog_by_slug(request, blog_slug, author=user.id)
     
     if not user or not blog: