allow to sort by $meta-projection

[deadem]

Small fix to allow sorting by meta-projections. This is needed for full-text search and sort results by relevancy. For example:

$query = Models\News::whereRaw([
   '$text' => [ '$search' => $request->Input('q') ]
])->project([ 'score' => [ '$meta' => 'textScore' ] ]);

$query->orderBy('score', [ '$meta' => 'textScore' ]);

http://docs.mongodb.org/manual/reference/operator/query/text/

[blitzfu]

👍