There are two parts to the solution here.
- You need to use a JSON API custom controller
- In your custom controller, you'll need to decide how to pass the
meta_query data structure
Depending on how robust you need this to be, you could use a variety of approaches. Here is the maximalist approach, that will allow any kind of meta_query, encoding the structure as a JSON string.
<?php
// 1. The class name must match the filename (i.e., "foo.php" for JSON_API_Foo_Controller)
// 2. Save this in your themes folder
// 3. Activate your controller under Settings > JSON API
class JSON_API_Example_Controller {
public function get_posts_by_meta_query() {
global $json_api;
if (empty($_GET['meta_query'])) {
return array(
'error' => "Specify a 'meta_query' param."
);
}
$query = array(
'ignore_sticky_posts' => true,
'numberposts' => -1,
'post_type' => 'event',
'meta_query' => json_decode($_GET['meta_query'], true)
);
return array(
'posts' => $json_api->introspector->get_posts($query)
);
}
}
?>
So if you want to pass this meta_query as URL-encoded JSON:
$args = array(
'numberposts' => -1,
'post_type' => 'event',
'meta_query' => array(
'relation' => 'AND',
array(
'key' => 'place',
'value' => 'Melbourne'
),
array(
'key' => 'dayoweek',
'value' => 'saturday'
)
)
);
Encode it like so, in JavaScript:
var meta_query = encodeURIComponent(JSON.stringify({
relation: 'AND',
0: {
key: 'place',
value:'Melbourne'
},
1: {
key: 'dayoweek',
value: 'saturday'
}
}));
Here's how that would look as a URL query param (a bit unwieldy):
/?json=example/get_posts_by_meta_query&meta_query=%7B%220%22%3A%7B%22key%22%3A%22place%22%2C%22value%22%3A%22Melbourne%22%7D%2C%221%22%3A%7B%22key%22%3A%22dayoweek%22%2C%22value%22%3A%22saturday%22%7D%2C%22relation%22%3A%22AND%22%7D
