mongoose-timestamp adds 4 properties to collection when I customize the names

[IderAghbal]

Hello,
I have the following in my code:

var mongoose = require('mongoose'),
      Schema = mongoose.Schema,
      timestamps = require('mongoose-timestamp');
var ItemSchema = new Schema({
      name: String
});
mongoose.plugin(timestamps,  {
    createdAt: 'added_at',
    updatedAt: 'last_updated'
});
ItemSchema.plugin(timestamps);

however when I look at my item collection using mongo command line I see that there is 4 properties (added_at, last_updated, createdAt and updatedAt)
what have I done wrong? ( @drudge ? )

[jspavlick]

This is happening to me, too.

[drudge]

Aren't you adding the plugin twice if you use mongoose.plugin() and ItemSchema.plugin(). Once with the custom field names, once without.

[jspavlick]

Ah. Works now. Thanks! I'd suggest an update to the documentation. My error was not immediately clear to me.