Pass IDs to pre_get_posts query in function

Question

I am trying to pass the post ids to the function\'s query->set and function will return the posts.

add_action( \'pre_get_posts\', \'query_booked_posts\' );

func         


        

Answer 1

I guess you have actually a PHP problem. When you do array($results_separated) you're basically creating an array from a string that looks like this: "12,114,56,". By doing that, PHP is creating an array like this:

array(
    0 => "12,114,56,"
)

And obviously WordPress cannot find any posts with such ID! What you want is actually an array like this:

array(
    0 => "12",
    1 => "114",
    2 => "56"
)

And actually that's what get_col() returns, so you just need to pass $results to set() function:

$query->set ( 'post__in', $results );

---

EDIT: Actually I realised that your problem is when you call $wpdb->get_col(...), because it's interfering with the $query you will execute later on... Those variables are using some other global variables that probably get overriden, and that's why you're not getting any results...

Answer 2

Except the extra array() over $results_separated, in my case I had to apply

if (!$query->is_main_query()) {
    return $query;
}

at the top of my function (found it in, otherwise, queries inside would be executed for several times and not properly. Comments in the answer helped me to figure this out.