Adding a formset to a form a la django dynamic formsets

[MikeAmy]

Not sure where to send this for a pull request. webtest seems django-agnostic, so here seemed best.

We (I work with Julien Aubert) had a test where there was javascript in the page to add a formset form with some data. In the browser this was done with javascript, using the django dynamic formset mechanism. This wasn't reproducible in webtest due to it not handling the javascript, so this code does the same as the javascript to enable the test.

No problem if you want to decline the request, just offering it in in case it might be useful for those in the same situation.

[kmike]

Thanks, this looks useful indeed!

I don't want to merge it right now because of monkey-patching. Also, some tests would be great - the code is not trivial.

Maybe create a PR to Webtest for making Form class an attribute of TestResponse? This will allow us to provide a custom Form class with django-specific goodies, and it looks a simple enough change.

The feature will be enabled only with newer WebTest versions then (older versions will be ignoring our custom form class), but I think that's fine.

[ranelpadon]

We have similar use case. We wanted to test a Django view involving a formset. It would be good if Django WebTest has support for dynamic/extra formset. We ended up implementing the suggestion below. :)

https://stackoverflow.com/questions/22708511/can-i-add-non-existing-field-to-form-with-webtest#answer-23877996

[gawel]

Maybe Form.add_field() can be added to webtest itself.