Cannot add setter on object path

I've got a location field which has nested lat and lng.

I want to set setter for it. mySchema.path('location).set(function(v) {});

But it says that i'm calling 'set' of undefined.

Setters works ok for simple fields. Why I can't use it for nested?

I want to use setter to ensure order of lat and lng fields which is required for mongodb.

No file or test is named. Start by reproducing the nested `location` case through the `mySchema.path(...).set(...)` entry point and compare it with a setter on a simple field; done means the nested setter behavior is supported for preserving `lat` and `lng` order, or the limitation is clearly documented.

Written by the indexing model from the issue text.