nl_tokens: Add a model to its appropriate collection . Retain the original contents of model . collection .
pl_tokens: function ( model ) { var coll = this . getCollection ( model ) ; if ( coll ) { var modelColl = model . collection ; coll . add ( model ) ; this . listenTo ( model , 'destroy' , this . unregister , this ) ; this . listenTo ( <mask> , 'relational:unregister' , this . unregister , this ) ; model . collection = modelColl ; } }