improve indexdb promised. fix multiple spaces access. add workspace persist + restore for mesh

src/mesh/group.js

@@ -26,8 +26,8 @@ let worker = moto.client.fn;
 mesh.group = class MeshGroup extends mesh.object {
 
     // @param group {MeshModel[]}
-    constructor(models = []) {
-        super();
+    constructor(models = [], id) {
+        super(id);
         this.group = new THREE.Group();
         this.models = [];
         for (let model of models) {
@@ -51,11 +51,14 @@ mesh.group = class MeshGroup extends mesh.object {
         space.update();
         call.model_add({model, group:this});
         worker.group_add({id: this.id, model:model.id});
+        // update data store
+        mesh.db.space.put(this.id, this.models.map(m => m.id));
         return this;
     }
 
     // @param model {MeshModel}
     remove(model) {
+        // console.log('group',this,'remove',model);
         // remove all models and group
         if (arguments.length === 0) {
             for (let m of this.models.slice()) {
@@ -63,18 +66,24 @@ mesh.group = class MeshGroup extends mesh.object {
             }
             return;
         }
-        model.group = undefined;
         this.models.remove(model);
         this.group.remove(model.mesh);
         // create message for listeners
         call.model_remove({model, group:this});
         // trigger sync with worker
-        worker.group_remove({id: this.id, model:model.id});
+        worker.group_remove({id: this.id, model: model.id});
+        // ensure worker cleanup of model
         model.remove(true);
         // auto-remove group when empty
         if (this.group.children.length === 0) {
             mesh.api.group.remove(this);
+            // update worker state
             worker.object_destroy({id: this.id});
+            // update object store
+            mesh.db.space.remove(this.id);
+        } else {
+            // update data store
+            mesh.db.space.put(this.id, this.models.map(m => m.id));
         }
         space.update();
         return this;