diff --git a/commis/cookbooks/models.py b/commis/cookbooks/models.py
index eedbc0a..5763c81 100644
--- a/commis/cookbooks/models.py
+++ b/commis/cookbooks/models.py
@@ -35,18 +35,21 @@ def from_dict(self, data):
                 cookbook.recipes.create(name=name, description=description)
         for type, label in CookbookFile.TYPES:
             for file_info in data.get(type, []):
+                new_content = False
                 try:
-                    cookbook_file = cookbook.files.get(type=type, file__checksum=file_info['checksum'])
+                    cookbook_file = cookbook.files.get(type=type, path=file_info["path"])
                 except CookbookFile.DoesNotExist:
+                    cookbook_file = cookbook.files.create(type=type, path=file_info["path"])
+                    new_content = True
+                else:
+                    if cookbook_file.file.checksum != file_info["checksum"]:
+                        new_content = True
+                if new_content:
                     try:
-                        file = SandboxFile.objects.get(checksum=file_info['checksum'])
+                        cookbook_file.file = SandboxFile.objects.get(checksum=file_info['checksum'], uploaded=True)
                     except SandboxFile.DoesNotExist:
                         raise ChefAPIError(500, 'Checksum %s does not match any uploaded file', file_info['checksum'])
-                    if not file.uploaded:
-                        raise ChefAPIError(500, 'Checksum %s does not match any uploaded file', file_info['checksum'])
-                    cookbook_file = cookbook.files.create(type=type, file=file)
                 cookbook_file.name = file_info['name']
-                cookbook_file.path = file_info['path']
                 cookbook_file.specificity = file_info['specificity']
                 cookbook_file.save()
         cookbook.save()
diff --git a/commis/data_bags/views.py b/commis/data_bags/views.py
index c9fb27c..9b5aac1 100644
--- a/commis/data_bags/views.py
+++ b/commis/data_bags/views.py
@@ -11,6 +11,7 @@
 from commis.data_bags.forms import DataBagForm, DataBagItemForm
 from commis.data_bags.models import DataBag, DataBagItem
 from commis.db import update
+from commis.utils import json
 
 class DataBagAPIView(CommisAPIView):
     model = DataBag
@@ -49,10 +50,13 @@ def item_get(self, request, bag_name, name):
     def item_update(self, request, bag_name, name):
         if not request.json:
             raise ChefAPIError(500, 'No data sent')
-        if request.json.get('id') != name:
+        data = request.json.get('raw_data')
+        if not isinstance(data, dict):
+            data = request.json
+        if not isinstance(data, dict) or data.get('id') != name:
             raise ChefAPIError(500, 'Name mismatch in data bag item')
         item = self.get_item_or_404(bag_name, name)
-        update(item, data=request.raw_post_data)
+        update(item, data=json.dumps(data))
         return HttpResponse(item.data, status=200, content_type='application/json')
 
     @api('DELETE', admin=True)
diff --git a/commis/wsgi.py b/commis/wsgi.py
new file mode 100644
index 0000000..d4d9653
--- /dev/null
+++ b/commis/wsgi.py
@@ -0,0 +1,32 @@
+"""
+WSGI config for commis project.
+
+This module contains the WSGI application used by Django's development server
+and any production WSGI deployments. It should expose a module-level variable
+named ``application``. Django's ``runserver`` and ``runfcgi`` commands discover
+this application via the ``WSGI_APPLICATION`` setting.
+
+Usually you will have the standard Django WSGI application here, but it also
+might make sense to replace the whole Django WSGI application with a custom one
+that later delegates to the Django one. For example, you could introduce WSGI
+middleware here, or combine a Django application with an application of another
+framework.
+
+"""
+import os
+
+# We defer to a DJANGO_SETTINGS_MODULE already in the environment. This breaks
+# if running multiple sites in the same mod_wsgi process. To fix this, use
+# mod_wsgi daemon mode with each site in its own daemon process, or use
+# os.environ["DJANGO_SETTINGS_MODULE"] = "commis.settings"
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "settings")
+
+# This application object is used by any WSGI server configured to use this
+# file. This includes Django's development server, if the WSGI_APPLICATION
+# setting points here.
+from django.core.wsgi import get_wsgi_application
+application = get_wsgi_application()
+
+# Apply WSGI middleware here.
+# from helloworld.wsgi import HelloWorldApplication
+# application = HelloWorldApplication(application)