I have a table with two foreign keys (id1 and id2), there are no other columns in the table.
The primary key on this table is a composite key (id1,id2).
The current version of go-reform does not allow to specify such a primary key.
This is a common case and there is no way to use save on such a schema.

In general go-reform always assumes that there is only one primary key column and it's a serial type.
It's not even possible to preset it to some value and save the record (the library generates an UPDATE in this case)
This is a strange requirement for a generic library.