I use Wp_query class to query my posts. 15 posts are in a template fetched on page load and their filtering works fine. Infinity scroll fetches for other posts using JSON restful services. The filter on the server side works fine but I don't know how to transfer the logic from the server to a proper query.

Meta_query array passed to Wp_query on the server:


  0 =>  array (size=3)
    'key' => string 'homepage' (length=8)
    'value' => string 'false' (length=5)
    'compare' => string 'NOT EXISTS' (length=10)
  1 => array (size=2)
    'key' => string '_newsml_id' (length=10)
    'compare' => string 'NOT EXISTS' (length=10)
  'relation' => string 'AND' (length=3)

How to translate that into the query? something like:




2 Answers 2


Sorry for answering my own question but it may help some other devs too.

I created this additional filter 'json_query_var-meta_query'that returns the necessary arguments.

function adjustQrry($data){
    $args = array();
    $args['relation'] = 'AND';

    foreach ($data as $key=>$value) {
        if ( 'relation' === $key ) {
            $args['relation'] = $data['relation'];
        if (  substr($key, 0, 3) === 'key' ) {
            $arg_num = substr($key, 3);
            $args[(int)$arg_num]['key'] = $value;
        if (  substr($key, 0, 7) === 'compare' ) {
            $arg_num_comp = substr($key, 7);
            $args[(int)$arg_num_comp]['compare'] = $value;
    return $args;

add_filter('json_query_var-meta_query', 'adjustQrry', 10, 1);

Now, I can call JSON restful like that to mimic the Wp_query posts filter already on the server:


Ref: https://github.com/WP-API/WP-API/issues/337

  • 5
    No need to apologize for answering your own question, that's something you should do if you're able :)
    – Ian Dunn
    May 12, 2015 at 16:45
  • As @IanDunn points out, answering your own question is definitely a good thing. You can accept your own answer too, so that others know you found a solution
    – phatskat
    Sep 11, 2015 at 15:52

what about WP REST API V2? I think this is not working on v2!

add_filter('json_query_var-meta_query', 'adjustQrry', 10, 1);

should it be like this?

add_filter('rest_query_vars-meta_query', 'adjustQrry', 10, 1);
  • 3
    I think, you shouldn't create a new question as an answer, but as a new question. Anyway, I think this would work: github.com/WP-API/WP-API/issues/2452 Apr 20, 2016 at 11:33
  • @websupporter thank you. yeah that is my question too :) you helped much. thanks again.
    – Amino
    Apr 20, 2016 at 12:57

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