Forms example does not work

[moshez]

The example in https://github.com/twisted/klein/blob/3e6db246d1272bf6daa07fab00fc3b610c07b1fa/docs/introduction/codeexamples/forms.py does not work with current klein.

The first error is that there is no such thing as Field.integer. When corrected to Field.number, the example runs, but when submitting the form, the result is a traceback:

2020-05-23 13:28:40-0700 [-] Unhandled Error                           [13/1985]        Traceback (most recent call last):
          File "/home/moshez/src/ppb-game/build/penguin/lib/python3.7/site-packa
ges/klein/_app.py", line 250, in _f                                                         return _call(instance, f, request, *a, **kw)     
          File "/home/moshez/src/ppb-game/build/penguin/lib/python3.7/site-packa
ges/klein/_app.py", line 55, in _call                                                       result = __klein_f__(*args, **kwargs)
          File "/home/moshez/src/ppb-game/build/penguin/lib/python3.7/site-packa
ges/twisted/internet/defer.py", line 1613, in unwindGenerator                               return _cancellableInlineCallbacks(gen)                                       File "/home/moshez/src/ppb-game/build/penguin/lib/python3.7/site-packa
ges/twisted/internet/defer.py", line 1529, in _cancellableInlineCallbacks                   _inlineCallbacks(None, g, status)
        --- <exception caught here> ---
          File "/home/moshez/src/ppb-game/build/penguin/lib/python3.7/site-packa
ges/twisted/internet/defer.py", line 1418, in _inlineCallbacks
            result = g.send(result)
          File "/home/moshez/src/ppb-game/build/penguin/lib/python3.7/site-packa
ges/klein/_requirer.py", line 153, in router
            **injected
          File "/home/moshez/src/ppb-game/build/penguin/lib/python3.7/site-packa
ges/klein/_app.py", line 55, in _call
            result = __klein_f__(*args, **kwargs)
          File "/home/moshez/src/ppb-game/build/penguin/lib/python3.7/site-packa
ges/twisted/internet/defer.py", line 1604, in unwindGenerator
            gen = f(*args, **kwargs)
        builtins.TypeError: mymethod() missing 1 required positional argument: '
request'

In the example, the routed and style decorator should be switched:

@requirer.require(
    style.routed(
        app.route("/", methods=["POST"]),
        tags.h1('u did it: ', slot("an-form-arg"))
    ),
    foo=Field.number(minimum=3, maximum=10), bar=Field.text(),
)
def postHandler(foo, bar):
    return {"an-form-arg": foo}

[glyph]

@moshez We should fix it so that they work in either order. Can you file a new bug?

[moshez]

Opened #351