[web-devel] Form Composition

Just passing this along: ---------- Forwarded message ---------- From: MightyByte To: web-devel@haskell.org Date: Tue, 21 Jun 2011 12:47:07 -0400 Subject: Form Composition I wrote something like this for formlets[1] quite some time ago.  (We called it massInput.)  For all practical purposes, formlets has been superceded by digestive-functors [2].  I re-implemented it again for digest-functors (called inputList) with more features and better design[3].  It's a tricky problem, and I went down several dead-end paths before converging on the solution as it exists in digestive-functors now.  If you're going to re-implement it with your form framework, I would highly recommend looking at our existing work first. [1] https://github.com/chriseidhof/formlets [2] https://github.com/jaspervdj/digestive-functors [3] http://hackage.haskell.org/packages/archive/digestive-functors/0.1.0.0/doc/h... On Thur, June 16, 2011 at 6:43 PM, Michael Snoyman wrote:

This is definitely something missing from the yesod-form API as is. I'm not quite sure how the API would look for this; has anyone given this some thought?

On Wed, Jun 15, 2011 at 7:06 AM, Tyson Whitehead wrote:

...

Hi All,

I'm wanting to make a form for "[a]" by composing forms for "a" along with added a delete options and a final add another option.

Is there an accepted way to do this sort of thing?  It doesn't seem to me to be a good fit for the applicative framework as it is not a fixed structure.

Cheers!  -Tyson