Nested grid relationship by date field
Here what he did:
"..converted date to float, then string, then appended two fields (event id
and date) and then converted to a string, in the pk table, I set that as
the index in phpgrid and then again in the subgrid parameter. Because the
same date could show up in multiple events, I created a concatenated kay
that would relate exactly and work with date. ..."
So essentially the key becomes a string when used for referencing detail table. As long as the date field is read only, this solution will work.
Richard