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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 <html><body>
The deed is done.
</body></html>
fun confirm (id : int) = return <html><body>
<p>Are you sure you want to delete ID #{txt _ id}?</p>
<p><a link={delete id}>I was born sure!</a></p>
</body></html>
fun main () : transaction page =
rows <- queryX (SELECT * FROM tab AS T)
(fn (fs : {T : $([Id = int] ++ M.cols)}) => <body>
<tr>
<td>{txt _ fs.T.Id}</td>
{foldTRX2 [idT] [colMeta'] [tr]
(fn (nm :: Name) (t :: Type) (rest :: {Type}) =>
[[nm] ~ rest] =>
fn v col => <tr>
<td>{col.Show v}</td>
</tr>)
[M.cols] (fs.T -- #Id) M.cols}
<td><a link={confirm fs.T.Id}>[Delete]</a></td>
</tr>
</body>);
return <html><head>
<title>{cdata M.title}</title>
</head><body>
<h1>{cdata M.title}</h1>
<table border={1}>
<tr>
<th>ID</th>
{foldTRX [colMeta'] [tr]
(fn (nm :: Name) (t :: Type) (rest :: {Type}) =>
[[nm] ~ rest] =>
fn col => <tr>
<th>{cdata col.Nam}</th>
</tr>)
[M.cols] M.cols}
</tr>
{rows}
</table>
</body></html>
end
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