Reply To: Custom Post Types & Index.php

• rentageekmom

• November 15, 2017 at 11:45 am

You’d have to overwrite what WordPress uses to generate the excerpt.

You could try something like this … (untested)

function filter_function_name( $excerpt ) {
  global $post;
  
  // Only do this on certain post types
  if('custom-post-type' == get_post_type($post)){  
    // Generate a 140 character excerpt
    $excerpt = substr(get_field('your_flexible_field',$post->ID),0,140); 
  }
  return $excerpt;
}
add_filter( 'get_the_excerpt', 'filter_function_name' );

Reference:
https://codex.wordpress.org/Plugin_API/Filter_Reference/get_the_excerpt