Override saveCompat for WordPress Media Uploader

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I am new to Backbone, so can’t understand what I am doing wrong. What I need is to override saveCompat (media-models.js line 310, WP 3.9.1). I am trying to do it same way I have overridden some media views 

wp.media.model.Attachment = wp.media.model.Attachment.extend({

    saveCompat: function( data, options ) {
        some code here...
    }
});

But it doesn’t work for me. Native WordPress saveCompat is executed. At the same time the very same idea is perfectly working for wp.media.view.AttachmentCompat for example

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wp.media.view.AttachmentCompat = wp.media.view.AttachmentCompat.extend({

    save: function( event ) {
        some code here...
    }
});

Thanks in advance!

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2 comments

  1. I figured it out. The correct way to extend it is:

    _.extend( wp.media.model.Attachment.prototype, {

    saveCompat: function( data, options ) {
        some code here...
    }
});

  2. Using _.extend removes the ability to call the super class implementation of methods. The proper (or at least a working) way to do it is to use Backbone’s extend method and then overwrite the prototype in wp.media.model.Attachment like this: 

    var MediaCreditAttachmentModel = wp.media.model.Attachment.extend( {
        saveCompat: function( data, options ) {
           ...
        }
} );

wp.media.model.Attachment.prototype = MediaCreditAttachmentModel.prototype;