[Dbix-class] Question on expressing relationship to one or other table depending on ENUM value

[John Ramsden]

[Please excuse resend, but first try was munged in daily digest, possibly d=
ue to RTF characters]
=A0
Hi DBIx::Class hackers
Let's say we have two unrelated tables, "tag" and "asset", each with their =
own sequence of auto-incrementing IDs (so of course the same ID may occur i=
n both, for records unrelated to each other).
Now suppose there is a third table, "edits", set up with a record to allow =
users to log edits to records in either of the above tables. So we define t=
his table by: =

CREATE TABLE `edit_log`
(
`id` int(11) NOT NULL auto_increment,
object_type ENUM('tag', 'asset'),
object_id int(11) NOT NULL,
`comment` text, =

::: =

); =

My question is how does one represent the extra condition on object type to=
 define this "one or other" relationship in the DBIx::Class module for the =
edit_log table, and for that matter in the "tag" and "asset" tables? =

Presumably in EditLog.pm it needs to be something along the lines of: =

__PACKAGE__->has_one (asset =3D> 'Ethel::Schema::Asset', { 'self.object_id'=
 =3D> 'foreign.id' }, { -is =3D> { 'self.object_type' =3D> 'asset' } );
__PACKAGE__->has_one (tag =3D> 'Ethel::Schema::Tag', { 'self.object_id' =3D=
> 'foreign.id' =

{ -is =3D> { 'self.object_type' =3D> 'tag' } ); =

I'm fairly sure the "-is" syntax is wrong, but that is basically my questio=
n. How should this condition be expressed? =

I did check the documentation, but found no examples of how to express extr=
a conditions. =

Many thanks in anticipation for any replies. =

=A0
Regards
John Ramsden


      =

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