Changeset 34729 for trunk/src/wp-includes/comment-template.php

Timestamp:

10/01/2015 03:10:13 AM (9 years ago)

Author:

boonebgorges

Message:

Simplify pagination logic in comments_template().

[34561] "fixed" the problem of newest-first comments showing fewer than
'per_page' comments on the post permalink when the total number of comments
was not divisible by 'per_page'. See #29462. But this fix caused numerous
other problems. First, comment pages reported by get_page_of_comment()
(which expects comment pages to be filled oldest-first) were no longer correct.
Second, and more seriously, the new logic caused comments to be shifted
between pages, making their permalinks non-permanent.

The current changeset reverts the changed behavior. In order to preserve the
performance improvements introduced in [34561], an additional query must be
performed when 'default_comments_page=newest' and 'cpage=0' (ie, you're viewing
the post permalink). A nice side effect of this revert is that we no longer
need the hacks required to determine proper comment pagination, introduced in
[34561].

See #8071. See #34073.

File:

• trunk/src/wp-includes/comment-template.php (modified) (1 diff)

trunk/src/wp-includes/comment-template.php

@@ -1241 +1241 @@
     }
 
-    /*
-     * For legacy reasons, higher page numbers always mean more recent comments, regardless of sort order.
-     * Since we don't have full pagination info until after the query, we use some tricks to get the
-     * right comments for the current page.
-     *
-     * Abandon all hope, ye who enter here!
-     */
-    $flip_comment_order = $trim_comments_on_page= false;
+    $comment_args['order']  = 'ASC';
     $comment_args['number'] = $per_page;
     $page = (int) get_query_var( 'cpage' );
-    if ( 'newest' === get_option( 'default_comments_page' ) ) {
-        if ( $page ) {
-            $comment_args['order'] = 'ASC';
-
-            /*
-             * We don't have enough data (namely, the total number of comments) to calculate an
-             * exact offset. We'll fetch too many comments, and trim them as needed
-             * after the query.
-             */
-            $offset = ( $page - 2 ) * $per_page;
-            if ( 0 > $offset ) {
-                // `WP_Comment_Query` doesn't support negative offsets.
-                $comment_args['offset'] = 0;
-            } else {
-                $comment_args['offset'] = $offset;
-            }
-
-            // Fetch double the number of comments we need.
-            $comment_args['number'] += $per_page;
-            $trim_comments_on_page = true;
-        } else {
-            $comment_args['order'] = 'DESC';
-            $comment_args['offset'] = 0;
-            $flip_comment_order = true;
-        }
+
+    if ( $page ) {
+        $comment_args['offset'] = ( $page - 1 ) * $per_page;
+    } elseif ( 'oldest' === get_option( 'default_comments_page' ) ) {
+        $comment_args['offset'] = 0;
     } else {
-        $comment_args['order'] = 'ASC';
-        if ( $page ) {
-            $comment_args['offset'] = ( $page - 1 ) * $per_page;
-        } else {
-            $comment_args['offset'] = 0;
-        }
+        // If fetching the first page of 'newest', we need a top-level comment count.
+        $top_level_query = new WP_Comment_Query();
+        $top_level_count = $top_level_query->query( array(
+            'count'   => true,
+            'orderby' => false,
+            'post_id' => $post->ID,
+            'parent'  => 0,
+        ) );
+
+        $comment_args['offset'] = ( ceil( $top_level_count / $per_page ) - 1 ) * $per_page;
     }
 
     $comment_query = new WP_Comment_Query( $comment_args );
     $_comments = $comment_query->comments;
-
-    // Delightful pagination quirk #1: `wp_list_comments()` expects the order to be wrong, so we make it wrong.
-    if ( $flip_comment_order ) {
-        $_comments = array_reverse( $_comments );
-    }
-
-    // Delightful pagination quirk #2: reverse chronological order requires page shifting.
-    if ( $trim_comments_on_page ) {
-        // Correct the value of max_num_pages, which is wrong because we manipulated the per_page 'number'.
-        $comment_query->max_num_pages = ceil( $comment_query->found_comments / $per_page );
-
-        // Identify the number of comments that should appear on page 1.
-        $page_1_count = $comment_query->found_comments - ( ( $comment_query->max_num_pages - 1 ) * $per_page );
-
-        // Use that value to shift the matched comments.
-        if ( 1 === $page ) {
-            $_comments = array_slice( $_comments, 0, $page_1_count );
-        } else {
-            $_comments = array_slice( $_comments, $page_1_count, $per_page );
-        }
-    }
 
     // Trees must be flattened before they're passed to the walker.