javascript - Backbone call model function -

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i have collection, collection i've selected model. in model i've defined function. how can call function of model selected collection?

where call model function (but undefined):

 var singlehomepostview = backbone.view.extend({      tagname: "li",       template: handlebars.compile(template),       events: {         "click #retweet": "retweet",        },       initialize: function () {         // console.log(this.model);      this.model.bind("change", this.render, this);      this.model.bind("destroy", this.close, this);     },      render: function (eventname) {       var ad = this.model.tojson();       ad.cid = this.model.cid;       $(this.el).html(this.template(ad));         return this;     },        retweet: function () {//here----------             console.log(this.model);// defined         console.log("retweet");         console.log(this.model.retweet()); //here try call model function       },       });

and model:

      var tweet = backbone.model.extend({      retweet: function(){       var params = {                 user_id: 11265832,                 //screen_name:"brad"                 page:1,                 count:2,             };               cb.__call(                 "statuses_usertimeline",                 params,                 function (reply) {                 //gestire rate limit error 429                  console.log(reply);                 // return reply;                  }             );      }      });

this main view call view. iterate on collection , pass model view.

 loadresults: function (eventname) {          //this.showspinner();         console.log("homepostview"+this.page);           this.isloading === true;              //console.log(this.integratedcollection);             _.each(this.integratedcollection.last(this.integratedcollection.length).reverse(), function(model){                   $(this.el).append(new singlehomepostview({                      model: model                    }).render().el);                },this);              this.isloading === false;;             return this;        },

seems collection should specify model type. see docs more info

update:

from annotated source: 

var model = backbone.model = function(attributes, options) {     var attrs = attributes || {};     options || (options = {});     this.cid = _.uniqueid('c');     this.attributes = {};     if (options.collection) this.collection = options.collection;     if (options.parse) attrs = this.parse(attrs, options) || {};     attrs = _.defaults({}, attrs, _.result(this, 'defaults'));     this.set(attrs, options);     this.changed = {};     this.initialize.apply(this, arguments); };

to associate model collection - not created collection via fetch - pass collection model when create (assumes this.collection actual collection instance):

new model({collection: this.collection})

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