diff --git a/orchestra/api/options.py b/orchestra/api/options.py
index a27ba72b..a56c3565 100644
--- a/orchestra/api/options.py
+++ b/orchestra/api/options.py
@@ -90,16 +90,20 @@ class LinkHeaderRouter(DefaultRouter):
         insert_links(viewset, base_name)
         self.registry.append((prefix, viewset, base_name))
     
+    def get_viewset(self, prefix_or_model):
+        for _prefix, viewset, __ in self.registry:
+            if _prefix == prefix_or_model or viewset.model == prefix_or_model:
+                return viewset
+        
     def insert(self, prefix_or_model, name, field, **kwargs):
         """ Dynamically add new fields to an existing serializer """
-        for _prefix, viewset, basename in self.registry:
-            if _prefix == prefix_or_model or viewset.model == prefix_or_model:
-                if viewset.serializer_class is None:
-                    viewset.serializer_class = viewset().get_serializer_class()
-                viewset.serializer_class.Meta.fields += (name,)
-                viewset.serializer_class.base_fields.update({name: field(**kwargs)})
-                setattr(viewset, 'inserted', getattr(viewset, 'inserted', []))
-                viewset.inserted.append(name)
+        viewset = self.get_viewset(prefix_or_model)
+        if viewset.serializer_class is None:
+            viewset.serializer_class = viewset().get_serializer_class()
+        viewset.serializer_class.Meta.fields += (name,)
+        viewset.serializer_class.base_fields.update({name: field(**kwargs)})
+        setattr(viewset, 'inserted', getattr(viewset, 'inserted', []))
+        viewset.inserted.append(name)
 
 
 # Create a router and register our viewsets with it.
diff --git a/orchestra/apps/resources/admin.py b/orchestra/apps/resources/admin.py
index f714b062..7f6ba1fe 100644
--- a/orchestra/apps/resources/admin.py
+++ b/orchestra/apps/resources/admin.py
@@ -96,6 +96,7 @@ def resource_inline_factory(resources):
         verbose_name_plural = _("resources")
         form = ResourceForm
         formset = ResourceInlineFormSet
+        can_delete = False
         
         class Media:
             css = {
diff --git a/orchestra/apps/resources/backends.py b/orchestra/apps/resources/backends.py
index 0ba02c4f..da9cc8f8 100644
--- a/orchestra/apps/resources/backends.py
+++ b/orchestra/apps/resources/backends.py
@@ -25,7 +25,7 @@ class ServiceMonitor(ServiceBackend):
         try:
             # TODO replace
             #return MonitorData.objects.filter(content_object=obj).latest().date
-            ct = ContentType.objects.get(app_label=obj._meta.app_label, model=obj._meta.model_name)
+            ct = ContentType.objects.get_for_model(type(obj))
             return MonitorData.objects.filter(content_type=ct, object_id=obj.pk).latest().date
         except MonitorData.DoesNotExist:
             return self.get_current_date() - datetime.timedelta(days=1)
diff --git a/orchestra/apps/resources/models.py b/orchestra/apps/resources/models.py
index 4cc85c7a..fa34d83d 100644
--- a/orchestra/apps/resources/models.py
+++ b/orchestra/apps/resources/models.py
@@ -103,7 +103,7 @@ class ResourceData(models.Model):
     object_id = models.PositiveIntegerField()
     used = models.PositiveIntegerField(null=True)
     last_update = models.DateTimeField(null=True)
-    allocated = models.PositiveIntegerField(null=True)
+    allocated = models.PositiveIntegerField(null=True, blank=True)
     
     content_object = GenericForeignKey()
     
diff --git a/orchestra/apps/resources/serializers.py b/orchestra/apps/resources/serializers.py
index 9cb36e8a..f63f5332 100644
--- a/orchestra/apps/resources/serializers.py
+++ b/orchestra/apps/resources/serializers.py
@@ -7,9 +7,6 @@ from .models import Resource, ResourceData
 
 
 class ResourceSerializer(serializers.ModelSerializer):
-    # TODO required allocation serializers (like resource form)
-    # TODO create missing ResourceData (like resource form)
-    # TODO make default allocation available on OPTIONS (like resource form)
     name = serializers.SerializerMethodField('get_name')
     
     class Meta:
@@ -19,9 +16,52 @@ class ResourceSerializer(serializers.ModelSerializer):
     
     def get_name(self, instance):
         return instance.resource.name
+    
+    def get_identity(self, data):
+        return data.get('name')
 
 
+# Monkey-patching section
+
 if not running_syncdb():
     for resources in Resource.group_by_content_type():
         model = resources[0].content_type.model_class()
-        router.insert(model, 'resources', ResourceSerializer, required=False)
+        router.insert(model, 'resources', ResourceSerializer, required=False, many=True)
+        
+        def validate_resources(self, attrs, source, _resources=resources):
+            """ Creates missing resources """
+            posted = attrs.get(source, [])
+            result = []
+            resources = list(_resources)
+            for data in posted:
+                resource = data.resource
+                if resource not in resources:
+                    msg = "Unknown or duplicated resource '%s'." % resource
+                    raise serializers.ValidationError(msg)
+                resources.remove(resource)
+                if not resource.ondemand and not data.allocated:
+                    data.allocated = resource.default_allocation
+                result.append(data)
+            for resource in resources:
+                data = ResourceData(resource=resource)
+                if not resource.ondemand:
+                    data.allocated = resource.default_allocation
+                result.append(data)
+            attrs[source] = result
+            return attrs
+        viewset = router.get_viewset(model)
+        viewset.serializer_class.validate_resources = validate_resources
+        
+        old_metadata = viewset.metadata
+        def metadata(self, request, resources=resources):
+            """ Display resource configuration """
+            ret = old_metadata(self, request)
+            ret['resources'] = [
+                {
+                    'name': resource.name,
+                    'ondemand': resource.ondemand,
+                    'default_allocation': resource.default_allocation
+                } for resource in resources
+            ]
+            return ret
+        viewset.metadata = metadata
diff --git a/orchestra/apps/users/roles/mail/backends.py b/orchestra/apps/users/roles/mail/backends.py
index a892703c..08e32ada 100644
--- a/orchestra/apps/users/roles/mail/backends.py
+++ b/orchestra/apps/users/roles/mail/backends.py
@@ -137,7 +137,7 @@ class PostfixAddressBackend(ServiceController):
 class AutoresponseBackend(ServiceController):
     verbose_name = _("Mail autoresponse")
     model = 'mail.Autoresponse'
-    
+
 
 class MailDisk(ServiceMonitor):
     model = 'email.Mailbox'