[js][database] fixed an issue where query methods were not returning correctly

lib/modules/database/query.js

@@ -11,8 +11,8 @@ export default class Query {
   modifiers: Array<DatabaseModifier>;
 
   constructor(ref: Reference, path: string, existingModifiers?: Array<DatabaseModifier>) {
-    ref.log.debug('creating Query ', path, existingModifiers);
     this.modifiers = existingModifiers ? [...existingModifiers] : [];
+    this._reference = ref;
   }
 
   orderBy(name: string, key?: string) {
@@ -21,6 +21,8 @@ export default class Query {
       name,
       key,
     });
+
+    return this._reference;
   }
 
   limit(name: string, limit: number) {
@@ -29,6 +31,8 @@ export default class Query {
       name,
       limit,
     });
+
+    return this._reference;
   }
 
   filter(name: string, value: any, key?: string) {
@@ -39,6 +43,8 @@ export default class Query {
       valueType: typeof value,
       key,
     });
+
+    return this._reference;
   }
 
   getModifiers(): Array<DatabaseModifier> {