Filtering a Backbone Collection returns an array of Models

Question

Sample Code:

this.books = this.getBooksFromDatabase();
this.publishedBooks = this.books.filter(function(book) {
  return book.get(\"isPublished\") === \"1\";         


        

Answer 1

var collection = new Backbone.collection(yourArray)

Answer 2

I often do something like this:

var collection = new MySpecialCollection([...]);
//And later...
var subset = new collection.constructor(collection.filter(...));

This will create an instance of the same type as your original collection, with the filtered models, so you can continue with the collection methods (each, filter, find, pluck, etc).

Answer 3

You could either instantiate a new backbone collection and pass in the array.

var myPublishedBooks = new MyBooksCollection(publishedBooks);

Or you could refresh your original collection.

this.books.refresh(publishedBooks)

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Note that the 0.5.0 release in July 2011 renamed refresh to reset, so you can achieve this in newer versions of Backbone with;

this.books.reset(publishedBooks)