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my (%org, %group);
@org{qw/id name/}   = @hashref{qw/org_id org_name/};
...
      org => \%org ,
      group => \%group
    });

@slash_org_fields=qw/id name/;
@db_org_fields=qw/org_id org_name/;
# Then just use them in place
@org{@slash_org_fields} = @hashref{@db_org_fields};