WordPress WP QUERY with OR condition - wordpress

Question

On my website, there are a couple of custom post types with default blog posts. On the blog posts, there are many categories.
One of the post types is webinar. I like to query all posts from the post type webinar and those blog posts that have category id 43
I tried following way but does not work.
1:
$query = new WP_Query(array(
'post_type' => array('webinar'), // I need all post from webinar
'cat' => '43', // I need all blog post under this category (Post type post category id 43)
);
Result: No post found
2:
$query = new WP_Query(array(
'post_type' => array('webinar','post'), // I need all post from webinar
'cat' => '43', // I need all blog post under this category (Post type post category id 43)
);
Result: Only posts of category id 43, no post from post types webinar
I need something like the following:
$query = new WP_Query(array(
array(
'relation' => 'OR',
array(
'post_type' => array('webinar')
),
array(
'post_type' => 'post',
'cat' => '43'
)
)
));
How can I do this?

Answer 1

Solution 1
// This could be cached in the site option
// in case this code will take a long time.
$webinar_terms = get_terms([
'taxonomy' => '{webinar_tax_name}',
'hide_empty' => true,
]);
$allowed_terms_ids = [];
foreach ( $webinar_terms as $term )
{
$allowed_terms_ids[] = $term->term_id;
}
// Add post cat to allowed terms.
$allowed_terms_ids[] = 43;
$query = new WP_Query([
'post_type' => ['webinar','post'],
'cat' => $allowed_terms_ids,
]);
NOTE
This will work only in case all webinar posts will be assigned to at least 1 {webinar_tax_name} term.
Solution 2
You may use posts_request hook and update SQL for 1 of your queries in your example. But I would prefer 1st solution as it will be more clear for other devs.

Answer 2

$posts = get_posts([
'post_type' => 'webinar',
'post_status' => 'publish',
'numberposts' => -1
]);

Answer 3

$post_data = get_posts( [
'post_type' => ['webinar', 'post'],
'posts_per_page' => - 1,
'tax_query' => array(
'taxonomy' => 'category',
'field' => 'term_id',
'terms' => '43'
),
] );
Would something like this work? I have not tested this so may need playing with a bit.
If you dont want to use get_posts then can always use new WP_Query but will need to ammend