set: function()

in brooklyn-ui/src/main/webapp/assets/js/libs/backbone.js [664:732]
47 lines of code
29 McCabe index (conditional complexity)

    set: function(models, options) {
      options = _.defaults(options || {}, setOptions);
      if (options.parse) models = this.parse(models, options);
      if (!_.isArray(models)) models = models ? [models] : [];
      var i, l, model, attrs, existing, sort;
      var at = options.at;
      var sortable = this.comparator && (at == null) && options.sort !== false;
      var sortAttr = _.isString(this.comparator) ? this.comparator : null;
      var toAdd = [], toRemove = [], modelMap = {};

      // Turn bare objects into model references, and prevent invalid models
      // from being added.
      for (i = 0, l = models.length; i < l; i++) {
        if (!(model = this._prepareModel(models[i], options))) continue;

        // If a duplicate is found, prevent it from being added and
        // optionally merge it into the existing model.
        if (existing = this.get(model)) {
          if (options.remove) modelMap[existing.cid] = true;
          if (options.merge) {
            existing.set(model.attributes, options);
            if (sortable && !sort && existing.hasChanged(sortAttr)) sort = true;
          }

        // This is a new model, push it to the `toAdd` list.
        } else if (options.add) {
          toAdd.push(model);

          // Listen to added models' events, and index models for lookup by
          // `id` and by `cid`.
          model.on('all', this._onModelEvent, this);
          this._byId[model.cid] = model;
          if (model.id != null) this._byId[model.id] = model;
        }
      }

      // Remove nonexistent models if appropriate.
      if (options.remove) {
        for (i = 0, l = this.length; i < l; ++i) {
          if (!modelMap[(model = this.models[i]).cid]) toRemove.push(model);
        }
        if (toRemove.length) this.remove(toRemove, options);
      }

      // See if sorting is needed, update `length` and splice in new models.
      if (toAdd.length) {
        if (sortable) sort = true;
        this.length += toAdd.length;
        if (at != null) {
          splice.apply(this.models, [at, 0].concat(toAdd));
        } else {
          push.apply(this.models, toAdd);
        }
      }

      // Silently sort the collection if appropriate.
      if (sort) this.sort({silent: true});

      if (options.silent) return this;

      // Trigger `add` events.
      for (i = 0, l = toAdd.length; i < l; i++) {
        (model = toAdd[i]).trigger('add', model, this, options);
      }

      // Trigger `sort` if the collection was sorted.
      if (sort) this.trigger('sort', this, options);
      return this;
    },