Add option for searching through nested properties

[levacic]

var data = [
    {
        "title": "Foo",
        "tags": ["foo", "bar", "baz"]
    },
    {
        "title": "Bar",
        "tags": ["bar", "qux"]
    }
];

It would be great to have the ability to search the data based on the tags property. It's possible to hack this up in user-code by concatenating the tags property into a string, with a unique imploding character, e.g.

var data = [
    {
        "title": "Foo",
        "tags": ["foo", "bar", "baz"],
        "_tags": "foo_bar_baz"
    },
    {
        "title": "Bar",
        "tags": ["bar", "qux"],
        "_tags": "bar_qux"
    }
];

...and search through that transformed data instead, but this is neither a clean nor a stable solution.

[hagabaka]

Maybe the search/sort "field" options can be generalized to take a function to map each item, for example

search('bar', fields: [
  function(item, term) {
    return item.tags.indexOf(item) >= 0;
  },
  'title'
]);

or

search('bar', fields: [
  function(item) {
    return item.tags.join('_');
  },
  'title'
]);