Just in case people missed it, Doug (MightyByte) sent a link to how he implemented this in digestive-functors[1]. I thought I'd spell it out on the list now, since I don't think I ever explained this: I wanted to base yesod-form off of digestive-functors, but its lack of custom forms was a problem. In yesod-form, we have three styles of form: applicative, monadic and input. d-f only supports applicative. I think a good medium-term strategy is for yesod-form to develop as it has been, adding the features that are necessary. When we feel comfortable with where it's at, I'd like to touch base with the d-f team and see if we can figure out a way to get these two libraries to work together. Michael [1] http://hackage.haskell.org/packages/archive/digestive-functors/0.1.0.0/doc/h... On Thu, Jun 16, 2011 at 10:16 PM, Greg Weber wrote:

rails: http://ryandaigle.com/articles/2009/2/1/what-s-new-in-edge-rails-nested-attr... django: https://docs.djangoproject.com/en/dev/topics/forms/formsets/ I don't see why we can't have new helpers for generating and consuming a list of forms that operate the same as now but just map over a list instead. Django also shows techniques we might use to display the forms. Greg Weber On Thu, Jun 16, 2011 at 11:43 AM, 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

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