Clean up and try to make intent of method clearer
Clean up and try to make intent of method clearer

Paul was confused about what `#hash_visit_data` did. We disucssed, but
did not arrive at a better alternative.  In the end, we agreed that the
best way to deal with it was to rename it and include a comment. The
renaming only gets you so far...

ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-2,ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-2,ministryofjustice/prison-visits-public,ministryofjustice/prison-visits-2,ministryofjustice/prison-visits-2,ministryofjustice/prison-visits-public