diff --git a/src/app/datasources/stores/model.store.spec.ts b/src/app/datasources/stores/model.store.spec.ts
index 4e94495..09dc3f9 100644
--- a/src/app/datasources/stores/model.store.spec.ts
+++ b/src/app/datasources/stores/model.store.spec.ts
@@ -27,11 +27,13 @@
 import {ConfigHelpers} from '../../core/services/helpers/config.helpers';
 import {AuthService} from '../rest/auth.rest';
 import {XosDebouncer} from '../../core/services/helpers/debounce.helper';
+import {IXosModeldefsCache} from '../helpers/modeldefs.service';
 
 let service: IXosModelStoreService;
 let httpBackend: ng.IHttpBackendService;
 let $scope;
 let WebSocket;
+let XosModeldefsCache;
 
 class MockWs {
   private _list;
@@ -69,6 +71,10 @@
       .service('ConfigHelpers', ConfigHelpers) // TODO mock
       .service('AuthService', AuthService)
       .constant('AppConfig', MockAppCfg)
+      .value('XosModeldefsCache', {
+        get: jasmine.createSpy('XosModeldefsCache.get').and.returnValue({}),
+        getApiUrlFromModel: jasmine.createSpy('XosModeldefsCache.getApiUrlFromModel')
+      })
       .service('XosDebouncer', XosDebouncer);
 
     angular.mock.module('ModelStore');
@@ -78,12 +84,14 @@
     XosModelStore: IXosModelStoreService,
     $httpBackend: ng.IHttpBackendService,
     _$rootScope_: ng.IRootScopeService,
-    _WebSocket_: any
+    _WebSocket_: any,
+    _XosModeldefsCache_: IXosModeldefsCache
   ) => {
     service = XosModelStore;
     httpBackend = $httpBackend;
     $scope = _$rootScope_;
     WebSocket = _WebSocket_;
+    XosModeldefsCache = _XosModeldefsCache_;
 
     // ModelRest will call the backend
     httpBackend.whenGET(`${MockAppCfg.apiEndpoint}/core/samples`)
@@ -96,6 +104,7 @@
     });
 
     it('the first event should be the resource response', (done) => {
+      XosModeldefsCache.getApiUrlFromModel.and.returnValue(`/core/samples`);
       let event = 0;
       service.query('sample')
         .subscribe(collection => {
@@ -114,6 +123,7 @@
   describe('the GET method', () => {
     it('should return an observable containing a single model', (done) => {
       let event = 0;
+      XosModeldefsCache.getApiUrlFromModel.and.returnValue(`/core/samples`);
       service.get('sample', queryData[1].id)
         .subscribe((model) => {
           event++;
@@ -177,6 +187,8 @@
     it('should create different Subject', (done) => {
       let fevent = 0;
       let sevent = 0;
+      XosModeldefsCache.get.and.callFake(v => v);
+      XosModeldefsCache.getApiUrlFromModel.and.callFake(v => `/core/${v}s`);
       service.query('first')
         .subscribe(first => {
           fevent++;
diff --git a/src/app/datasources/stores/model.store.ts b/src/app/datasources/stores/model.store.ts
index 7735ff0..10c4d2e 100644
--- a/src/app/datasources/stores/model.store.ts
+++ b/src/app/datasources/stores/model.store.ts
@@ -23,6 +23,7 @@
 import {IXosResourceService} from '../rest/model.rest';
 import {IStoreHelpersService} from '../helpers/store.helpers';
 import {IXosDebouncer} from '../../core/services/helpers/debounce.helper';
+import {IXosModeldefsCache} from '../helpers/modeldefs.service';
 
 export interface  IXosModelStoreService {
   query(model: string, apiUrl?: string): Observable<any>;
@@ -31,7 +32,14 @@
 }
 
 export class XosModelStore implements IXosModelStoreService {
-  static $inject = ['$log', 'WebSocket', 'StoreHelpers', 'ModelRest', 'XosDebouncer'];
+  static $inject = [
+    '$log',
+    'WebSocket',
+    'StoreHelpers',
+    'ModelRest',
+    'XosDebouncer',
+    'XosModeldefsCache'
+  ];
   private _collections: any; // NOTE contains a map of {model: BehaviourSubject}
   private efficientNext: any; // NOTE debounce next
   constructor(
@@ -39,7 +47,8 @@
     private webSocket: IWSEventService,
     private storeHelpers: IStoreHelpersService,
     private ModelRest: IXosResourceService,
-    private XosDebouncer: IXosDebouncer
+    private XosDebouncer: IXosDebouncer,
+    private XosModeldefsCache: IXosModeldefsCache
   ) {
     this._collections = {};
     this.efficientNext = this.XosDebouncer.debounce(this.next, 500, this, false);
@@ -59,6 +68,7 @@
       this.efficientNext(this._collections[modelName]);
     }
 
+    // NOTE do we need to subscriber every time we query?
     this.webSocket.list()
       .filter((e: IWSEvent) => e.model === modelName)
       .subscribe(
@@ -128,8 +138,7 @@
   private loadInitialData(model: string, apiUrl?: string) {
     // TODO provide always the apiUrl together with the query() params
     if (!angular.isDefined(apiUrl)) {
-      // NOTE check what is the correct pattern to pluralize this
-      apiUrl = this.storeHelpers.urlFromCoreModel(model);
+      apiUrl = this.XosModeldefsCache.getApiUrlFromModel(this.XosModeldefsCache.get(model));
     }
     this.ModelRest.getResource(apiUrl).query().$promise
       .then(