Overwriting backbone params to comply with rails conventions

backbone-ext.js

// Overwrite Backbone#sync in order to allow easy form submissions
(function ($) {

  // Modify params in order to follow the Rails convention:
  // comments: [Obj, Obj]           => comments_attributes: { 0: Obj, 1: Obj }
  // video: { id: 2, title: 'foo' } => video_attributes: { id: 2, title: 'foo' }
  var railifyParams = function (params) {
    for (var key in params) {
      if (!params.hasOwnProperty(key)) continue;
      if (params[key] instanceof Object) {
        params[key + '_attributes'] = (params[key] instanceof Array) ? toObj(params[key]) : railifyParams(params[key]);
        delete params[key];
      }
    }
    return params;
  };

  // Recursively turn Array to Object converting indices to Obj keys
  var toObj = function (arr) {
    var obj = {};
    for (var i = 0; i < arr.length; i ++) {
      if (arr[i] instanceof Array) arr[i] = toObj(arr[i]);
      obj[i] = arr[i];
    }
    return obj;
  };

  var _OldBackboneSync = Backbone.sync;

  Backbone.sync = function (method, model, options) {
    if (options.data == null && model && ['create', 'update', 'patch'].indexOf(method) !== -1 ) {
      options.contentType = 'application/json';
      data = JSON.stringify(options.attrs || model.toJSON(options));
      if (model.paramRoot) {
        data = {};
        data[model.paramRoot] = railifyParams(model.toJSON(options));
      } else {
        data = model.toJSON();
      }
      options.data = JSON.stringify(data);
    }
    return _OldBackboneSync.apply(Backbone, arguments);
  };
})(jQuery);

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