#24788: Allow Forms to set a default prefix attribute
-----------------------------+--------------------
Reporter: kezabelle | Owner: nobody
Type: New feature | Status: new
Component: Forms | Version: master
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
-----------------------------+--------------------
Example of what I'd like to be able to do:
{{{
from django import forms
class MyForm(forms.Form):
field = ChoiceField(...)
prefix = 'myform-is-awesome'
>>> form_itself = MyForm(data=request.GET, files=None)
>>> form_itself.prefix
'myform-is-awesome'
}}}
However this isn't currently workable, because
[https://github.com/django/django/blob/master/django/forms/forms.py#L86
self.prefix] is always bound based on the argument given in the arguments,
the default of which is `None`
By hoisting the prefix to be a class attribute, and then doing
{{{
if prefix is not None:
self.prefix = prefix
}}}
it seems like forms which ship with apps could effectively namespace
themselves such that N overlapping form fields could be POSTed at once and
resolved to the correct form.
However, that's only a suggested use-case that hints at why it might be
useful to have; the reason I specifically needed this was for validating
whether a GET request was likely my filtering form, '''before'''
instantiating and validating the data:
{{{
filtered_form = any(x.startswith(MyForm.prefix) for x in
request.GET.keys())
}}}
so that I can selectively reset session-saved filters only when a new
filterset is done (before then saving validated submitted data back into
the session).
My workaround ended up looking like:
{{{
class MyForm(forms.Form):
prefix = 'woo'
def __init__(self, *a, *kw):
super(MyForm, self).__init__(*a, **kw)
self.prefix = self.__class__.prefix
}}}
which seems a bit ... rubbish.
--
Ticket URL: <https://code.djangoproject.com/ticket/24788>
Django <https://code.djangoproject.com/>
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