# The current artwork belongs to a cd by artist1
# but the artwork itself is painted by artist2
#
-# What we try is all possible permutations of join/prefetch
+# What we try is all possible permutations of join/prefetch
# combinations in both directions, while always expecting to
# arrive at the specific artist at the end of each path.
my $cd_paths = {
'no cd' => [],
+ 'no cd empty' => [ '' ],
+ 'no cd undef' => [ undef ],
+ 'no cd href' => [ {} ],
+ 'no cd aoh' => [ [{}] ],
+ 'no cd complex' => [ [ [ undef ] ] ],
'cd' => ['cd'],
'cd->artist1' => [{'cd' => 'artist'}]
};
my $a2a_paths = {
'no a2a' => [],
+ 'no a2a empty ' => [ '' ],
+ 'no a2a undef' => [ undef ],
+ 'no a2a href' => [ {} ],
+ 'no a2a aoh' => [ [{}] ],
+ 'no a2a complex' => [ [ '' ] ],
'a2a' => ['artwork_to_artist'],
'a2a->artist2' => [{'artwork_to_artist' => 'artist'}]
};