Example showing how to override Backbone Model sync method (specific to a model)

MyModelOverrideLocal.js

var MyModelOverrideLocal = Backbone.Model.extend({
  
  sync: function (method, model, options) {
    
    if ( method === 'delete' ) {
        if ( options.data ) {
            // properly formats data for back-end to parse
            options.data = JSON.stringify(options.data);
        }
        // transform all delete requests to application/json
        options.contentType = 'applicaton/json';
    }    
    
    if (method === 'read') {
      // Do something
    }
    
    if( method === 'create'){
      // Do something
    }
    
    if( method === 'update'){
      // Do something
    }
    
    Backbone.apply(this, [method, model, options]);
  }
  
});