Improve toString behavior of DbObjects

Author: cjbj

lib/dbObject.js

@@ -123,6 +123,15 @@ class BaseDbObject {
     throw TypeError("obj is not iterable");
   }
 
+  [Symbol.toPrimitive](hint) {
+    switch (hint) {
+      case 'number':
+        return NaN;
+      default:
+        return '[' + this.fqn + '] ' + util.inspect(this._toPojo(), {});
+    }
+  }
+
   toJSON() {
     return this._toPojo();
   }