fix an issue on component model validation

Author: ecarriou

src/component.js

@@ -1034,9 +1034,7 @@ function addProperties(model, Class, classId) {
                 propertyValue = new Date(component[propertyName]);
                 break;
               case propertyType === 'json':
-                propertyValue = JSON.parse(
-                  JSON.stringify(component[propertyName])
-                );
+                propertyValue = component[propertyName];
                 break;
               case propertyType === 'array':
                 propertyValue = new _Array({
@@ -1362,9 +1360,7 @@ function addStructure(path, name, model, id) {
                 );
                 break;
               case propertyType === 'json':
-                propertyValue = JSON.parse(
-                  JSON.stringify(getStructureValue(model, id, fullPath))
-                );
+                propertyValue = getStructureValue(model, id, fullPath);
                 break;
               case $metamodel.isStructure(fullPath, model):
                 propertyValue = addStructure(

src/metamodel.js

@@ -1957,18 +1957,23 @@ exports.isValidType = function isValidType(value, typeName) {
    * @description Check if an object is compliant with a class
    */
   function _checkClassName(value, typeName) {
-    var isValid = true;
+    var isValid = false;
     var typeRef = getRealClassName(typeName);
     var component = value;
 
     if (value !== '' && value !== null) {
       if (hasType(value, 'string')) {
         component = $component.get(value);
       }
-      if (getClassName(component) !== typeRef && component.id) {
-        isValid = false;
-        $log.invalidClassType(value, typeName);
+      if (getClassName(component) === typeRef && component && component.id) {
+        isValid = true;
       }
+    } else {
+      isValid = true;
+    }
+
+    if (!isValid) {
+      $log.invalidClassType(value, typeName);
     }
     return isValid;
   }