Thanks John,

That would be the same documentation that I’ve skipped over a dozen times trying to trace the function… maybe I should change the comments to a more contrasting colour…  and also using the right syntax helps (EP::DO::Subject::create rather than EP::DO::Subject->create)

 

Point of note though, the $name parameter appears to actually be an array of hashes with a slightly different format from the comment – the line below is the one that finally worked!

 

$new_subject_obj = EPrints::DataObj::Subject::create($repository,"new_subject_id",[{"name"=>"New Subject Name",lang=>"en"}],["ROOT"],0);

 

Thanks for your help!  (still not sure about whether create_child has a bug or I do though, in case anyone wants to dig deeper?)

 

Alan

 

 

Aahhhhh, this is a good’un…

 

In ~/perl_lib/EPrints/DataObj/Subject.pm, lines 278-291… I’ll recreate them here:

 

######################################################################

# =pod

#

# =item $subject = EPrints::DataObj::Subject::create( $session, $id, $name, $parents, $depositable )

#

# Creates a new subject in the database. $id is the ID of the subject,

# $name is a multilang data structure with the name of the subject in

# one or more languages. eg. { en=>"Trousers", en-us=>"Pants}. $parents

# is a reference to an array containing the ID's of one or more other

# subjects (don't make loops!). If $depositable is true then eprints may

# belong to this subject.

#

# =cut

######################################################################

 

As you can see – a nice block of documentation… but unfortunately, each line starts with a ‘#’ – so the pod doesn’t get parsed as a pod – and you don’t get to see what’s going on! (this is still the case in https://github.com/eprints/eprints/blob/3.3/perl_lib/EPrints/DataObj/Subject.pm - I’ll patch it!).

 

Cheers,

John

 

 

 

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.

 

Alan

 

 

 

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?

 

Cheers,

John

 

 

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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