CODEWITHSUNDEEP
javascriptbackbone.js
Michael Phelps
Michael Phelps

Reputation: 3591

How get model from Collection by id?

Help me. How get model from Collection by id?

var Sidebar = Backbone.Model.extend({});
var sidebar = new Sidebar;
var Library = Backbone.Collection.extend({})
lib=new Library();

lib.add(sidebar,{at: 234});

console.log(lib.get(234))//undefined ..Why??

Upvotes: 2

Views: 79

Answers (2)

Jonathan Lonowski
Jonathan Lonowski

Reputation: 123423

You seem to be mixing id and index, which aren't interchangeable.

To retrieve by id, you'll want to set it with the Model:

var sidebar = new Sidebar({ id: 234 });

// ...

console.log(lib.get(234));

The index is the placement within the collection:

lib.add(sidebar, { at: 0 });

console.log(lib.at(0));     // sidebar
console.log(lib.models);    // Array: [ sidebar ]
console.log(lib.models[0]); // sidebar

Upvotes: 4

Sushanth --
Sushanth --

Reputation: 55740

Try this

var Sidebar = Backbone.Model.extend({
     // Need to set this. Otherwise the model
     // does not know what propert is it's id
     idAttribute : 'at'
});
var sidebar = new Sidebar();
var Library = Backbone.Collection.extend({})
var lib=new Library();

// Set the Model
sidebar.set({at:234});

// Add it to the collection
lib.add(sidebar);

console.log(lib.get(234))

Check Fiddle

The way you were adding the collection will be spliced at that index and the model inserted at that index. I don't think that is not what you want. So you need to set the attributes to the model first and then add it to the collection.

Upvotes: 0

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