/* I'll put here different examples of dynamic query for Oxygen repeater :
 * - Use one of the following repeater_dynamic_query definitions
 *   in code block just BEFORE the repeater
 * - Set the repeater custom query settings : post type, number of posts, order...
 * - Add the remove_action in a code block AFTER the repeater
 */


/****************************************************************************************************
 * Display related posts for any CPT with taxonomy:
 * - Filter query to prevent altering queries inside the repeater items,
 * - Retrieve post category slug : I have only one for each post, so I just take first element
 *   (You might need to add error tests, of course, if you don't accept empty results,
 *    for instance if you forgot to set post category.)
 * - Set tax_query arg with category slug
 * - Set random order
 * - Exclude current post
 * - Deactivate pagination
 */

/* Code block just BEFORE the repeater */
<?php
function repeater_dynamic_query( $query ) {
  global $post;
  if ( $query->query['post_type'][0] == 'post' ) {
    $cat = wp_get_post_terms( $post->ID , 'category', array( 'fields' => 'slugs' ) )[0];
    $query->set( 'tax_query', array(
                                array(
                                  'taxonomy' => 'category',
                                  'field' => 'slug', 
                                  'terms' => $cat,
                                  'include_children' => false
                                )
                              ) );
    $query->set( 'orderby', 'rand' );
    $query->set( 'post__not_in', array($post->ID) );
    $query->set( 'no_found_rows', true );
  }
}
add_action( 'pre_get_posts', 'repeater_dynamic_query' );
?>

/*
 * REPEATER: use custom query and set post type to "post" or any cpt slug,
 * number of posts per page as you wish,
 * and replace "category" by your cpt taxonomy slug if needed
 */

/* Code block just AFTER the repeater */
<?php
remove_action( 'pre_get_posts', 'repeater_dynamic_query' );
?>
  
  
  
/****************************************************************************************************
 * Display only sticky posts with repeater:
 * - Get only sticky posts
 * - Deactivate pagination
 */

/* Code block just BEFORE the repeater */
<?php
  function repeater_dynamic_query( $query ) {
  if ( $query->query['post_type'][0] == 'post' ) {
    $query->set( 'post__in', get_option( 'sticky_posts' ) );
    $query->set( 'no_found_rows', true );
  }
}
add_action( 'pre_get_posts', 'repeater_dynamic_query' );
?>
  
/*
 * REPEATER: use custom query and set post type to "post",
 * number of posts per page and order as you wish,
 * AND DO NOT UNCHECK "Ignore sticky posts"
 */

/* Code block just AFTER the repeater */
<?php
remove_action( 'pre_get_posts', 'repeater_dynamic_query' );
?>