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An optics-like library for `Slick`
Will be a test for a more advanced version of this library.
Currently, we can turn a Query[Rep[Option[A], ...]
into a Query[Rep[A], ...]
pretty easily if we can supply a default A
, by doing:
query.map(maybeA => maybeA.getOrElse(defaultA))
.
We should be able to lift this to arbitrary product-type rows.
We should also be able to do this without supplying a default A
by filtering away all rows that are missing an A
.
Generic "drop LHS from a Tuple2" implementation. Requires acquiring the component types of the non-lifted tuple of a query, which we know must exist because we have a tuple extractor already.
Generic optional lifter for appenders: (QA[RE, RA, A] => QA[Option[RE], Option[RA], Option[A]])
Given a "thing that appends a value given an RE
", we should be able to generically update this to a "thing that appends an optional value given an optional RE
".
For a lawful QA, this should be doable.
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