FromField and ToField for anonymous Postgres records?

[michalrus]

Hello!

How can I make (a, b) == (1, 2) in

[Only (a, b)] <- query_ c "select (1, 2)"

? This (1,2) is:

psql=> select (1,2);
  row  
-------
 (1,2)
(1 row)

Thank you!

[lpsmith]

This is something that does eventually need to get implemented. I don't think it is possible to have the same level of type-checking as the rest of postgresql-simple, though.

[tomjaguarpaw]

This would be very useful for something I'm doing in Opaleye. Could anyone give me a clue how to get started?