Bug 32894: Remove wrong caching from Koha:: methods - simple

Bug 32894: Remove wrong caching from Koha:: methods - simple

In some of our Koha:: objects we have methods that cache their result and return it in subsequent calls. However there is no invalidation of the cache if the object is modified.

For instance, in Koha/ArticleRequest.pm

sub biblio {
    my ($self) = @_;

    $self->{_biblio} ||= Koha::Biblios->find( $self->biblionumber() );

    return $self->{_biblio};
}

This pattern exists in several places.

It can lead to confusion and incorrect results, such as:

use Koha::ArticleRequests;
my $ar = Koha::ArticleRequest->new({
    borrowernumber => 42,
    biblionumber => 42,
})->store;
say $ar->biblio->biblionumber;               # Display 42, correct
$ar->set({ biblionumber => 24 })->store;
say $ar->biblio->biblionumber;               # Display 42, wrong
$ar->discard_changes;
say $ar->biblio->biblionumber;               # Display 42, wrong
$ar->delete;

We should remove those caching and rely on DBIC/DBMS caching mechanism instead.

This patch is adjusting the trivial occurrences

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 68216c541bfd9b5baf5e3fe97c0a99d193dfccce)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>