compatibility with jsonform

[fuhrysteve]

Thanks for this great, handy little library. I can't imagine you'd want to accept this pull request as-is, since it breaks backwards compatibility pretty severely..

If you have any suggestions, however, for how to accomplish what I'm trying to do here in a more flexible way (I'm essentially rendering a more complete json-schema output), then let me know (presuming this project is still active).

In any case, this seems to accomplish what I'm looking to do and will work just fine for me.

Thanks!

[zbyte64]

Your explicit matching of field classes is the proper way forward imho. If there are more projects like wtforms_components that would make sense to integrate with then we would want a module folder with an import for each integration. As for flexibility, conversions could allow for callables to be registered as well as dictionaries. When it comes across a callable, it will be called with the field being converted and the return will be treated as attributes to merge.