separated groups and suppliers for material PUT and POST

src/routes/validate/material.ts

@@ -70,6 +70,8 @@ export default class MaterialValidate {  // validate input for material
 
   static output (data) {  // validate output and strip unwanted properties, returns null if not valid
     data = IdValidate.stringify(data);
+    data.group = data.group_id.name;
+    data.supplier = data.supplier_id.name;
     const {value, error} = Joi.object({
       _id: IdValidate.get(),
       name: this.material.name,