You are storing multiple references to the same variable into your structure, but you meant to store references to different arrays. 

for my $i ( 0 .. $#$proj ) {
   my $time = $dbh->selectall_arrayref($stmt, {Slice => {}}, $project_
+id);

   my @users;  # Create a new array every pass through the loop.
   
   for my $j ( 0 .. $#$time ) {
      push @users, $time->[$j];
   }

   $proj->[$i]{'users'} = \@users;
}

[download]

By the way, undef @users; is also a bug, since it clears both @users and @{ $proj->[$i]{'users'} } since they're the same variable.

Update: The above code can be simplified to 

for my $i ( 0 .. $#$proj ) {
   my $time = $dbh->selectall_arrayref($stmt, {Slice => {}}, $project_
+id);
   $proj->[$i]{'users'} = $time;
}

[download]

In reply to Re: Adding an AoH to an AoH by ikegami
in thread Adding an AoH to an AoH by bradcathey

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