Feature(QueryTools): added possibility to query subobjects in livequery

[stck]

I've added possibility to subscribe to nested object with LiveQuery.
(not real code example)

{
    ...
    type: 'input',
    attributes: {
      disabled: false,
      class: 'input-class'
    }
}

For example, at this moment I can't subscribe for object.attributes.class. I've added possibility to look up for nested keys, but left match detection unchanged.

var q = new Parse.Query('Activities');
q.equalTo('attributes.class', 'input-class');

• Tests added
• Whole-project tests passed

[dstarke]

I filed bug #3321 for this issue. I didn't see this pull request before I filed pull request #3322, which fixes the same issue.

However, I don't believe that the version in this pull request works correctly for queries that have more than one condition that test a subobject. If one such condition matches and another does not, the code here can return a match when it should not.

As a result, I would recommend using the code in pull request #3322, rather than the code here.

[acinader]

duplicate of #3322

thanks for the effort @stck