Attachment 122770 Details for Bug 28700 – Bug 28700 - unblessed in Object.pm has blessed values in some cases

[patch] Bug 28700 - unblessed in Object.pm has blessed values in some cases

Bug-28700---unblessed-in-Objectpm-has-blessed-valu.patch (text/plain), 4.35 KB, created by Peter Vashchuk on 2021-07-12 07:46:20 UTC

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Creator: Peter Vashchuk

Created: 2021-07-12 07:46:20 UTC

Size: 4.35 KB

patch

obsolete

>From dbe196715c6bff195b2c369938b4eb573f4bb841 Mon Sep 17 00:00:00 2001
>From: Petro Vashchuk <stalkernoid@gmail.com>
>Date: Mon, 12 Jul 2021 10:45:22 +0300
>Subject: [PATCH] Bug 28700 - unblessed in Object.pm has blessed values in some
> cases
>
>This "unblessed" sub acts as such: creates a hash from fields prepared
>in memory by DBIX::Class. In case when we get data from DB our fields
>are filled with scalars and all unblessed hash returned as keys with
>scalar values. This is the expected behavior and feature for which
>this method was created.
>
>But in some cases, when we modify the DBIX::Class field in Perl code
>(and then it get stored into DB), we pass some special objects to
>DBIX::Class, not scalars. For example DateTime object. It is stored
>in proper form into DB (converted by DBIX::Class to proper text form
>with required date format), but still kept in memory for this field
>_as object_! And this is the source of the bug: because now when we use
>the "unblessed" method, the value for DATE or TIMESTAMP field is
>returned for us by DBIX::Class in the same form as we provided it
>some lines above in Perl code: i.e. as "DateTime Object".
>
>For example: when the "dateaccessioned" column in the "items" table
>is NULL, "dateaccessioned" gets prefilled by this Perl code
>(file: KohaCommunity/Koha/Item.pm around line 198):
>
>    unless ( $self->dateaccessioned ) {
>        $self->dateaccessioned($today);
>    }
>
>    my $result = $self->SUPER::store;
>    if ( $log_action && C4::Context->preference("CataloguingLog") ) {
>        $action eq 'create'
>          ? logaction( "CATALOGUING", "ADD", $self->itemnumber, "item" )
>          : logaction( "CATALOGUING", "MODIFY", $self->itemnumber, "item
>           " . Dumper( $self->unblessed ) );
>    }
>
>it gets assigned with DateTime object, stored in Perl process in
>DBIX::Class as Object, and converted to scalar only when stored to DB,
>but, in the same code piece above, when we have
>Dumper( $self->unblessed ), it is passed as blessed value for key
>"dateaccessioned", so as we see, when we dumping this record just a few
>lines below into object_log, the "dateaccessioned" value appears as a
>blessed object rather than the standard date/time text scalar we expect
>it to be.
>
>This patch adds the ability for the "unblessed" subroutine in the
>Object.pm to make scalar results for ref type DateTime.
>
>I have chosen "->stringify" for DateTime because that anyway will
>happen if we try to use the DateTime object in any strings,
>concatenations, or prints. For now, it returns the iso8601 text date
>which has all the needed data saved. It might be different from which
>value stored in the end into DB because the DB field might be simpler
>(just date), but anyway we _expect_ that unblessed method should give
>just scalars as keys/values, or refs to deeper structures like
>arrays/hashes but scalars as well, not objects inside
>(nothing blessed inside).
>
>I also added a warning for us to have it logged if we have any other
>blessed values returned as a key by the unblessed method.
>
>To reproduce:
>1) at the items table pick any item you see fit, find the
>"dateaccessioned" column of it, and set it NULL.
>2) go to your koha and edit that item (doesn't matter what you change
>as long as you make some change), save it afterward.
>3) check the action_logs table and find there a newly created MODIFY
>item row, "info" column of that contains dumped data, find
>"dateaccessioned" among that data and notice that it is an object,
>optional: check and note about the size of it.
>4) apply the patch.
>5) repeat steps 1-3, ensure that "dateaccessioned" contains usual
>date/time data (iso8601 formatted in our case).
>---
> Koha/Object.pm | 13 +++++++++++--
> 1 file changed, 11 insertions(+), 2 deletions(-)
>
>diff --git a/Koha/Object.pm b/Koha/Object.pm
>index 806d42d1aa..9fc01a243e 100644
>--- a/Koha/Object.pm
>+++ b/Koha/Object.pm
>@@ -318,8 +318,17 @@ Returns an unblessed representation of object.
> 
> sub unblessed {
>     my ($self) = @_;
>-
>-    return { $self->_result->get_columns };
>+    my %res = $self->_result->get_columns;
>+    for my $k (keys %res) {
>+        my $reftype = ref $res{$k};
>+        # overwrite current object-vaule with it's unblessed value
>+        if( $reftype eq 'DateTime' ) {
>+            $res{$k} = "$res{$k}";
>+        } elsif( $reftype ne '' ) {
>+            warn "Don't know how to unbless ref '$reftype'";
>+        }
>+    }
>+    return \%res;
> }
> 
> =head3 $object->get_from_storage;
>-- 
>2.31.1

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