Convert mongo collection to jquery select2 data

gistfile1.js

/*
 Convert mongo collection data to select2 data array that support children (nested)

 I use it for convert Meteor collection to select2 data

 Example:

 data = [ {_id: 1, name: "foo1"},
          {_id: 2, name: "child 1 of foo1", p: 1}
          {_id: 3, name: "child 2 of foo1", p: 1}
        ]

 console.log( col2sel(data, 'p', 'name', '_id') );

 [{text: 'foo1', children: [
    {text: 'child 1 of foo1', id: 2}
    {text: 'child 2 of foo1', id: 3}
 ]}]


*/
col2sel = function(array, parentKey, textKey, idKey) {

  function find(data, parent) {
    return _.chain(data)
    // parent filter
      .filter(function(item) { 
        // if parent false then return only empty or itemst that have no parent
        if (parent === false &&
            (! _.has(item, parentKey) ||
             item [parentKey] === ""))
          return true;
        else
          // иначе отдаем те чей отец - parent
          return (item[ parentKey ] == parent);
      })
    // create item for select2 with children if need
      .map(function(item) {
        var parentId = item [ idKey ],
            children = find(array, parentId),
            newItem = {
              text: item [ textKey ],

            };
        if (!_.isEmpty(children)) {
          newItem.children = children;
        } else {
          newItem.id = item [ idKey ];
        }
        return newItem;
      })
      .value();
  }

  // start, traverse root items
  return find(array, false);
};