yesod-dsl-0.2.0: codegen/default-filter-id-field.cg

                "id" -> case (FS.f_value fjm >>= PP.fromPathPiece)  of 
                    (Just v') -> where_ $ defaultFilterOp (FS.f_negate fjm) (FS.f_comparison fjm) (~{vn} ~{projectField False} ~{en}Id) (val v')
                    _        -> return ()