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[EP-tech] Re: Subject trees

What documentation are you looking at John?  Think I’m fighting with the parameters on ‘create’.  When I try the following code:


#!/usr/bin/perl -w -I/opt/eprints3/perl_lib

use strict;

use EPrints;


my $ep = EPrints->new();

my $repository = $ep->repository( "repoid" );


my $tech_item = EPrints::DataObj::Subject->create($repository, "new_item_id",[{"name"=>"New Item Description"}],["parentid"],1);



I get an error message

Can't use string ("EPrints::DataObj::Subject") as a HASH ref while "strict refs" in use at /opt/eprints3/perl_lib/EPrints/DataObj.pm line 968.



Within ‘create_child’ it uses $self->{subjectid} as the value for parentid, but from debugging it looks like the value is actually in $self->{data}->{subjectid}  not sure if this is me not understanding something about eprints  structure or a possible bug?


The subjects don’t seem to need commit() to add them (at least via create_child – I had it in the code originally but it didn’t seem to make a difference) and reindexing the subject dataset hasn’t done anything.  Thanks for the ideas though.





From: eprints-tech-bounces@ecs.soton.ac.uk [mailto:eprints-tech-bounces@ecs.soton.ac.uk] On Behalf Of John Salter
Sent: 06 January 2016 21:20
To: 'eprints-tech@ecs.soton.ac.uk' <eprints-tech@ecs.soton.ac.uk>
Subject: [EP-tech] Re: Subject trees


No experience – but looking at the documentation, you could possibly achieve what you need with the ‘create’ method instead?


Other thoughts are:

- does anything change when you commit() the new subject?

- does reindexing the subjects change anything?





From: eprints-tech-bounces@ecs.soton.ac.uk [mailto:eprints-tech-bounces@ecs.soton.ac.uk] On Behalf Of Alan.Stiles
Sent: 06 January 2016 17:35
To: eprints-tech@ecs.soton.ac.uk
Subject: [EP-tech] Subject trees


Hi all,

Anyone have any experience with updating the subject tree via the API?   (using 3.3.10 but current github module for EPrints::DataObj::Subject looks similar)


I’m trying to add a new top level entry with the following code snippet…


                my $rootsubj = EPrints::DataObj::Subject->new($repository,"ROOT");

                exit unless defined($rootsubj);

                my $newsubj = $rootsubj->create_child("newid",[{name=>"New Top Level Subject"}],0);


It creates the subject, but orphaned rather than linked to the ROOT object as I’d expect…

Any clues?


Alan Stiles

Digital Repository Developer

Library Services, The Open University


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