meta_query, how to search using both relation OR & AND?

Question

Resolved: See answer below.

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I have a custom post type called BOOKS. It has several custom fields, named: TITLE, AUTHOR, GE

Answer 1

After a bit trial and error I find a solution to this. This is logical I mean meta_query does not supports the array for field "key", but giving the array in "key", I'm getting the perfect solution. I may be sound crazy but it's working like charm.

$args => array(
    'relation' => 'AND',
    array(
        'key' => array('title','author','genre',),
        'value' => $searchvalue,
        'compare' => '='
    ),
    array(
        'key' => 'rating',
        'value' => $ratingvalue,
        'compare' => '=',
        'type' => 'NUMERIC'

    )
)

You only get a warning for "trim()" as we are passing an array instead of a string. Suppress that warning or Please add something if you find a better solution.