mongoose leaking fields between objects

[azylman]

If I create an object "property one" with a field data that has a mixed schema type, leave it empty, fetch that property from the database, set the data field, save it, create a second property ("property two"), leave the data field empty, save it to the database, then look it up, the data field is now populated with the same data as the first property.

My guess is that it's related to the lack of minimize: false.

https://gist.github.com/azylman/5139583

[aheckmann]

Mongoose is behaving properly. The data field has its default set to a single object instance, therefore all documents will have their default data field set to this instance. If you'd like to use a different instance for each document, set the default to a function that returns an object literal.

Schema({ data: { type: Mixed, default: function () { return {} } }})

I'd like to change this (its come up before) but it should probably wait til 4.x.

[aheckmann]

on second thought, this is really lame. lets just fix this for 3.6 and point out the change.