Editing Generic Reporting Framework (section)

===Export Virtual Report Fields (v3.0+ only)===
The list of fields to be included in a report export, may now also include virtual report fields. These fields do not need to be defined anywhere else in the dataset configuration.

To define a virtual report field, first include it in the list of the 'exportfields', e.g.

<pre>
$c->{eprint_report}->{exportfields} = {
        eprint_report_core => [ qw(
                eprintid
                title
                virtual_field_foo
        )]
};
</pre>

For the field to be exported successfully, we must define a function that generates a value to be included in the export. E.g.

<pre>
$c->{eprint_report}->{custom_export} = {
        virtual_field_foo => sub {
                my( $dataobj, $plugin ) = @_;
                return "My exported value";       
        }
};
</pre>

To return values over multiple rows in the multiline CSV export, we can simply return an array of the values we want to return.

The export functions (which may also be used to override existing fields in the dataset), receive both the dataobject and the report plugin as parameters, which may be used when generating the value that is to be exported.