con colMeta' = fn t :: Type => {Nam : string, Show : t -> xbody}
con colMeta = fn cols :: {Type} => $(Top.mapTT colMeta' cols)
functor Make(M : sig
con cols :: {Type}
constraint [Id] ~ cols
val tab : sql_table ([Id = int] ++ cols)
val title : string
val cols : colMeta cols
end) = struct
open constraints M
val tab = M.tab
fun delete (id : int) =
() <- dml (DELETE FROM tab WHERE Id = {id});
return
The deed is done.
fun confirm (id : int) = return
Are you sure you want to delete ID #{txt _ id}?
I was born sure!
fun main () : transaction page =
rows <- queryX (SELECT * FROM tab AS T)
(fn (fs : {T : $([Id = int] ++ M.cols)}) =>
| {txt _ fs.T.Id} |
{foldTRX2 [idT] [colMeta'] [tr]
(fn (nm :: Name) (t :: Type) (rest :: {Type}) =>
[[nm] ~ rest] =>
fn v col =>
| {col.Show v} |
)
[M.cols] (fs.T -- #Id) M.cols}
[Delete] |
);
return
{cdata M.title}
{cdata M.title}
| ID |
{foldTRX [colMeta'] [tr]
(fn (nm :: Name) (t :: Type) (rest :: {Type}) =>
[[nm] ~ rest] =>
fn col =>
| {cdata col.Nam} |
)
[M.cols] M.cols}
{rows}
end