Title: Using Hooks With Comment Query
Last modified: February 3, 2020

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# Using Hooks With Comment Query

 *  [joshuask8dev](https://wordpress.org/support/users/joshuask8dev/)
 * (@joshuask8dev)
 * [6 years, 4 months ago](https://wordpress.org/support/topic/using-hooks-with-comment-query/)
 * Hello, I am looking to filter comments with a hook so that users can only see
   their own comment. I would like to put this in the child theme folder in functions.
   php. I have made this alteration in wp-comment-query.php however on updates I
   do believe those changes should be overwritten. I changed the code from: $where
   = ‘WHERE = ‘ . $where; to: $where = ‘WHERE user_id = ‘ . get_current_user_id().‘
   AND comment_approved <> “trash” AND comment_post_ID = ‘ . get_the_id(); and this
   had been working for the time being but my understanding is that when an update
   rolls around the code will be obsolete/overwritten.

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/)
 * (@bcworkz)
 * [6 years, 4 months ago](https://wordpress.org/support/topic/using-hooks-with-comment-query/#post-12394444)
 * That’s right, altering core code is a very poor practice for a number of reasons.
   Don’t do it. You should use the “pre_get_comments” action hook. The entire WP_Comment_Query
   object is passed by reference to your callback function. You can then set/unset
   the various array elements of WP_Comment_Query::query_vars to alter the eventual
   SQL query. The array keys are the same as the [__construct() parameters](https://developer.wordpress.org/reference/classes/wp_comment_query/__construct/).
 *  Thread Starter [joshuask8dev](https://wordpress.org/support/users/joshuask8dev/)
 * (@joshuask8dev)
 * [6 years, 4 months ago](https://wordpress.org/support/topic/using-hooks-with-comment-query/#post-12394505)
 * So I have this for a function to filter out comments by the current user that
   is logged in ID and per page:
 *     ```
       function wps_get_comment_list_by_user($clauses) {
   
       global $user_ID, $wpdb;
       $clauses['join'] = ", wp_posts";
   
       $where = ‘WHERE user_id = ‘ . get_current_user_id() . ‘ AND comment_approved <> “trash” AND comment_post_ID = ‘ . get_the_id();
   
       return $clauses;
       };
   
       add_filter('pre_get_comments', 'wps_get_comment_list_by_user');
       ```
   
 * Are we close to getting it so that comments on each page only show to the user
   logged in that they posted themselves?
 *  Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/)
 * (@bcworkz)
 * [6 years, 4 months ago](https://wordpress.org/support/topic/using-hooks-with-comment-query/#post-12398644)
 * “pre_get_comments” is an action, not a filter. You should add you callback with
   add_action(). It basically does the same as add_filter(), but its concept is 
   different. Using the wrong function muddles your code’s (eventual) clarity. With
   actions there is little point in returning a value. It will be ignored by WP.
 * The comments query doesn’t have a SQL clauses filter like WP_Query does for posts,
   so you cannot use SQL modification to alter the query. Your callback is passed
   the WP_Comments_Query object by reference, not SQL clauses. You must act upon
   the object directly. If your function collects the object as `$query`, do something
   like
    `$query->query_vars['user_id'] = get_current_user_id();`

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Using Hooks With Comment Query’ is closed to new replies.

## Tags

 * [action](https://wordpress.org/support/topic-tag/action/)
 * [comment](https://wordpress.org/support/topic-tag/comment/)
 * [filter](https://wordpress.org/support/topic-tag/filter/)
 * [hook](https://wordpress.org/support/topic-tag/hook/)

 * In: [Developing with WordPress](https://wordpress.org/support/forum/wp-advanced/)
 * 3 replies
 * 2 participants
 * Last reply from: [bcworkz](https://wordpress.org/support/users/bcworkz/)
 * Last activity: [6 years, 4 months ago](https://wordpress.org/support/topic/using-hooks-with-comment-query/#post-12398644)
 * Status: not resolved

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