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[EP-tech] Re: Understanding how data objects link

On 15/01/14 12:30, Ian Stuart wrote:

On 15/01/14 12:02, Sebastien Francois wrote:

On 15/01/14 12:00, Ian Stuart wrote:

Yes!! good hint!
That sent me off to look at the History dataObj - and that showed that I
needed:

		{ name=>"datasetid", type=>"text", text_index=>0, },

Just a detail - /datasetid/ should be of type "id" not "text"

Nope - text

In DataObj::SubObject::get_parent -

   $datasetid = $self->get_value( "datasetid" ) unless defined $datasetid;
   $objectid = $self->get_value( "objectid" ) unless defined $objectid;

   my $ds = $session->get_repository->get_dataset( $datasetid );
   my $parent = $ds->get_object( $session, $objectid );

.... and both of these calls are looking for string names

(but I'll test some more)
"Id" doesn't imply "numerical" - Id fields don't get text indexed and are retrieved via an EXact match. 

===

perldoc EPrints/MetaField/Id.pm:
EPrints::MetaField::Id(3) User Contributed Perl Documentation EPrints::MetaField::Id(3) 


NAME
       EPrints::MetaField::Id - an identifier string

DESCRIPTION
Use Id fields whenever you are storing textual data that needs to be matched exactly (e.g. filenames). 

===

See User::username for a real example.
Note that a number of fields in EPrints are wrongly of type "text" (e.g. eprint.dir, eprint.source etc...) 

Seb.