nl_tokens: Adds observers to a model type class .
pl_tokens: function ( type , typesUpdated ) { var self = this , records = this . getRecords ( <mask> ) ; var onChange = function ( ) { typesUpdated ( [ self . wrapModelType ( type ) ] ) ; } ; var observer = { didChange : function ( ) { Ember . run . scheduleOnce ( 'actions' , this , onChange ) ; } , willChange : Ember . K } ; records . addArrayObserver ( this , observer ) ; var release = function ( ) { records . removeArrayObserver ( self , observer ) ; } ; return release ; }