如何在functions.php上使用多个pre_get_posts？

Question

I will try to explain as good as I can (sorry if my english is bad, this is not my native):

I have two custom post types and two custom post type archive pages for each of them.

To filter posts which are displayed in those pages I created two different functions inside functions.php file with "pre_get_posts" function as you can see in code below.

My functions.php:

add_action('pre_get_posts', 'my_pre_get_posts'); 
function my_pre_get_posts( $query ) {

some code here...

}

add_action('pre_get_posts', 'my_pre_get_posts_2');
function my_pre_get_posts_2( $query ) {

some code here...

}

The problem is that second function (my_pre_get_posts_2) is overwriting first one (my_pre_get_posts) and first function is not working on custom post type archive page.

I tried to use is_post_type_archive( 'custom_post_type' ) but first function still is not working.

What I need to do to assign first function only to specific custom post type archive page and not to call it on any other pages?

Answer 1

This is covered in the Codex. You should use a single callback:

function my_pre_get_posts( $query ){
    if ( is_post_type_archive('cpt_1') ) {
        // Do stuff for a custom post type
    } elseif ( is_post_type_archive('cpt_2') ) {
        // Do stuff for a different custom post type
    }
}
add_action('pre_get_posts', 'my_pre_get_posts');