backbone.js - A "url" property or function must be specified -

i'm trying download collection of documents mongodb, using nodejs, browser, using backbone. can use simple ajax request take advantage of backbone, backbone should request.

there empty collection:

//create model , collection task_lists var mtasklist = backbone.model.extend({     defaults: {         title: 'untitled task list'     },     urlroot: '/task_list' }); var ctasklists = new backbone.collection({     model: mtasklist,     url: '/task_list' }); 

when try fetch data server:

ctasklists.fetch({reset: true, data: {workspace: swsurl}}); //ask data server 

it throws error: uncaught error: "url" property or function must specified

i tried different combinations of url same error thrown.

the first parameter expected in collection constructor list of models, options hash comes second:

constructor / initialize new collection([models], [options])
when creating collection, may choose pass in initial array of models.

try

var ctasklists = new backbone.collection([], {     model: mtasklist,     url: '/task_list' }); 

and fiddle play http://jsfiddle.net/nikoshr/l4xsj/