pre_get_posts

In WordPress, pre_get_posts is a hook that allows for modification of an existing WP_Query before the query is run on the server.

Ajax Load More queries have a custom alm_id parameter attached to the WP_Query, this parameter allows developers to target a specific instance of Ajax Load More for modification while using pre_get_posts.

In the code sample below, an instance Ajax Load More with the ID of design-listing will be modified to return all posts of the design category.

// [ajax_load_more id="design-listing"]
function my_custom_category( $query ) {	
	if ( isset( $query->query['alm_id'] ) && $query->query['alm_id'] === 'design-listing' ) {
		$query->set( 'category_name', 'design' );
		$query->set( 'posts_per_page', -1 );
	}
}
add_action( 'pre_get_posts', 'my_custom_category' );

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