From 678ad6b0f33fbd05da033ce04f14e14951aa7a9e Mon Sep 17 00:00:00 2001
From: Dave Lawrence <dlawrence@mozilla.com>
Date: Tue, 7 Jan 2014 00:10:18 -0500
Subject: Bug 956052 - backport upstream bug 945535 to bmo/4.2 for performance
 improvement in bugs with large number of attachments

---
 Bugzilla/Attachment.pm | 36 +++++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 15 deletions(-)

diff --git a/Bugzilla/Attachment.pm b/Bugzilla/Attachment.pm
index 1a12e65b1..bb0f83aba 100644
--- a/Bugzilla/Attachment.pm
+++ b/Bugzilla/Attachment.pm
@@ -62,6 +62,7 @@ use Bugzilla::Hook;
 
 use File::Copy;
 use List::Util qw(max);
+use Storable qw(dclone);
 
 use base qw(Bugzilla::Object);
 
@@ -635,12 +636,12 @@ sub _check_is_private {
 
 =over
 
-=item C<get_attachments_by_bug($bug_id)>
+=item C<get_attachments_by_bug($bug)>
 
 Description: retrieves and returns the attachments the currently logged in
              user can view for the given bug.
 
-Params:     C<$bug_id> - integer - the ID of the bug for which
+Params:     C<$bug> - Bugzilla::Bug object - the bug for which
             to retrieve and return attachments.
 
 Returns:    a reference to an array of attachment objects.
@@ -648,14 +649,14 @@ Returns:    a reference to an array of attachment objects.
 =cut
 
 sub get_attachments_by_bug {
-    my ($class, $bug_id, $vars) = @_;
+    my ($class, $bug, $vars) = @_;
     my $user = Bugzilla->user;
     my $dbh = Bugzilla->dbh;
 
     # By default, private attachments are not accessible, unless the user
     # is in the insider group or submitted the attachment.
     my $and_restriction = '';
-    my @values = ($bug_id);
+    my @values = ($bug->id);
 
     unless ($user->is_insider) {
         $and_restriction = 'AND (isprivate = 0 OR submitter_id = ?)';
@@ -672,17 +673,22 @@ sub get_attachments_by_bug {
     # attachment listed here, we collect all the data at once and
     # populate $attachment->{flags} ourselves.
     if ($vars->{preload}) {
-        $_->{flags} = [] foreach @$attachments;
-        my %att = map { $_->id => $_ } @$attachments;
+        # Preload flag types and flags
+        my $vars = { target_type  => 'attachment',
+                     product_id   => $bug->product_id,
+                     component_id => $bug->component_id,
+                     attach_id    => $attach_ids };
+        my $flag_types = Bugzilla::Flag->_flag_types($vars);
 
-        my $flags = Bugzilla::Flag->match({ bug_id      => $bug_id,
-                                            target_type => 'attachment' });
-
-        # Exclude flags for private attachments you cannot see.
-        @$flags = grep {exists $att{$_->attach_id}} @$flags;
-
-        push(@{$att{$_->attach_id}->{flags}}, $_) foreach @$flags;
-        $attachments = [sort {$a->id <=> $b->id} values %att];
+        foreach my $attachment (@$attachments) {
+            $attachment->{flag_types} = [];
+            my $new_types = dclone($flag_types);
+            foreach my $new_type (@$new_types) {
+                $new_type->{flags} = [ grep($_->attach_id == $attachment->id,
+                                            @{ $new_type->{flags} }) ];
+                push(@{ $attachment->{flag_types} }, $new_type);
+            }
+        }
 
         # Preload attachers.
         my %user_ids = map { $_->{submitter_id} => 1 } @$attachments;
@@ -697,7 +703,7 @@ sub get_attachments_by_bug {
           $dbh->selectall_hashref('SELECT attach_id, LENGTH(thedata) AS datasize
                                    FROM attachments LEFT JOIN attach_data ON attach_id = id
                                    WHERE bug_id = ?',
-                                   'attach_id', undef, $bug_id);
+                                   'attach_id', undef, $bug->id);
 
         # Force the size of attachments not in the DB to be recalculated.
         $_->{datasize} = $sizes->{$_->id}->{datasize} || undef foreach @$attachments;
-- 
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