[Dbix-class] Issue when prefetching two level deep has_many relationships

[Matt S Trout]

Nilson Santos Figueiredo Junior wrote:
> On 9/21/06, Nilson Santos Figueiredo Junior <acid06 at gmail.com> wrote:
>> I further dove into the code and I've found exactly where the problem
>> is inside the _collapse_result() method. The following check should
>> fail, however it succeeds:
>>
>>     while (
>>       !(
>>         grep {
>>           !defined($tree->[0]->{$_}) || $co_check{$_} ne $tree->[0]->{$_}
>>         } @co_key
>>         )
>>     ) { ... }
> 
> No wonder it always succeeds, %co_check is defined as:
> 
> my %co_check = map { ($_, $tree->[0]->{$_}); } @co_key;
> 
> I think this probably means more than one level deep has_many
> relationships are really broken. In an A has_many B has_many C
> situation, whenever you've got a B that doesn't have any C's, the
> following B rows will magically disappear from your resultset.
> 
> I honestly have no clue on how to fix it, hopefully someone else does.
> I think I've already provided the best information I could on this
> issue. This only affects prefetched has_many relationships.

Give me a failing test rather than a mailing list thread and I'll fix it.

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