Start on new constructed inventory API view

Make the GET function work at most basic level

Basic functionality of updating working

Add functional test for the GET and PATCH views

Add constructed inventory list view for direct creation

Add limit field to constructed inventory serializer

awx/api/views/inventory.py

@@ -31,6 +31,7 @@ from awx.api.views.labels import LabelSubListCreateAttachDetachView
 
 from awx.api.serializers import (
     InventorySerializer,
+    ConstructedInventorySerializer,
     ActivityStreamSerializer,
     RoleSerializer,
     InstanceGroupSerializer,
@@ -79,7 +80,9 @@ class InventoryDetail(RelatedJobsPreventDeleteMixin, RetrieveUpdateDestroyAPIVie
 
         # Do not allow changes to an Inventory kind.
         if kind is not None and obj.kind != kind:
-            return Response(dict(error=_('You cannot turn a regular inventory into a "smart" inventory.')), status=status.HTTP_405_METHOD_NOT_ALLOWED)
+            return Response(
+                dict(error=_('You cannot turn a regular inventory into a "smart" or "constructed" inventory.')), status=status.HTTP_405_METHOD_NOT_ALLOWED
+            )
         return super(InventoryDetail, self).update(request, *args, **kwargs)
 
     def destroy(self, request, *args, **kwargs):
@@ -94,6 +97,18 @@ class InventoryDetail(RelatedJobsPreventDeleteMixin, RetrieveUpdateDestroyAPIVie
             return Response(dict(error=_("{0}".format(e))), status=status.HTTP_400_BAD_REQUEST)
 
 
+class ConstructedInventoryDetail(InventoryDetail):
+    serializer_class = ConstructedInventorySerializer
+
+
+class ConstructedInventoryList(InventoryList):
+    serializer_class = ConstructedInventorySerializer
+
+    def get_queryset(self):
+        r = super().get_queryset()
+        return r.filter(kind='constructed')
+
+
 class InventorySourceInventoriesList(SubListAttachDetachAPIView):
     model = Inventory
     serializer_class = InventorySerializer