Databases
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    <p>The <a href="http://backbonejs.org/#Collection-comparator"><code>comparator</code></a> function is used to compare two models in the collection and it can compare them in any (consistent) way that it wants to. In particular, it can choose which model attribute to use so you could have something like this in your collection:</p> <pre><code>initialize: function() { this.sort_key = 'id'; }, comparator: function(a, b) { // Assuming that the sort_key values can be compared with '&gt;' and '&lt;', // modifying this to account for extra processing on the sort_key model // attributes is fairly straight forward. a = a.get(this.sort_key); b = b.get(this.sort_key); return a &gt; b ? 1 : a &lt; b ? -1 : 0; } </code></pre> <p>and then you just need some methods on the collection to change the <code>sort_key</code> and call <a href="http://backbonejs.org/#Collection-sort"><code>sort</code></a>:</p> <pre><code>sort_by_thing: function() { this.sort_key = 'thing'; this.sort(); } </code></pre> <p>In older Backbones, calling <code>sort</code> will trigger a <code>"reset"</code> event whereas newer versions will trigger a <code>"sort"</code> event. To cover both cases you can listen to both events and re-render:</p> <pre><code>// in the view... initialize: function() { this.collection.on('reset sort', this.render, this); } </code></pre> <p>Demo: <a href="http://jsfiddle.net/ambiguous/7y9CC/">http://jsfiddle.net/ambiguous/7y9CC/</a></p> <p>You can also use <a href="http://backbonejs.org/#Events-listenTo"><code>listenTo</code></a> instead of <a href="http://backbonejs.org/#Events-on"><code>on</code></a> to help you avoid zombies:</p> <pre><code>initialize: function() { this.listenTo(this.collection, 'reset sort', this.render); } </code></pre> <p>Demo: <a href="http://jsfiddle.net/ambiguous/nG6EJ/">http://jsfiddle.net/ambiguous/nG6EJ/</a></p>
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    1. COCan I use this pattern in a situation where the sort fields are strings
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    2. CO@MrFoh: Yes, `>` and `<` work on strings, the `s` attribute in the demo is a string.
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    3. CONote this example no longer works because Backbone no longer fires the reset event on sort. It fires the sort event.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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