+def sfa_add_user_to_slice(request, user_hrn, slice_params):
+ query = Query.update('slice').filter_by('user_hrn', '==', user_hrn).set(slice_params).select('slice_hrn')
+ results = execute_query(request, query)
+ if not results:
+ raise Exception, "Could not create %s. Already exists ?" % slice_params['hrn']
+ return results
+