Long ago, Matthew Bevan wrote:
I wrote and submitted to the docs.turbogears.org server the following:
http://docs.turbogears.org/1.0/UnifiedControllers
It describes in full detail (with source code) how to combine form/
action controllers without any of problems associated with just
@exposing and @validating the entire thing. The code described also
has the added benefit of allowing validation of forms built at
execution time.
The gist of it is:
class MyController(Controller):
@expose(template="project.templates.genericform")
def index(self, **kw):
form = MyForm(fields=MyFields())
if kw:
@validate(form=form)
def get_errors(self, tg_errors=None, **data):
return tg_errors, data
tg_errors, data = get_errors(self, **kw)
[...]
I like it. Really. The two methods way has always been a pet peeve of mines.
But I don't want to copy-and-paste the inner function a few hundred of
times, so I extracted it, _and_ abused tg_errors:
def get_errors(self, form, **kw):
@validate(form=form)
def valid(self, tg_errors=None, **kw):
return tg_errors, kw
if not kw:
return {'xxx':'This message should not be displayed. Not an
error, really. The form is empty yet.'}, kw
return valid(self, **kw)
So, this is my controller for adding a user while validating the data:
@expose(template='erp.templates.users.add')
def add(self, **kw):
form = UserAddForm.form
tg_errors, data = get_errors(self, form, **kw)
if not tg_errors:
user = User.new(**data)
tg.flash("User '%s' has been created" % user.uid)
raise tg.redirect('/users/view', uid=user.uid))
return dict(form=form)
(User.new checks for duplicates and the like)
Seems to work, with default field values too, and... I have a unified
controller/error_handler that is shorter and simpler than the two
functions pattern.
Now, since I am not well-versed in decorator intricacies and magic, I
hope it won't explode on me, or break with python 2.5.
Too easy, is it?
I'm still looking for a nice way to avoid spurious "please insert a
value" when passing some default by GET method. uhm.
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