id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
17127	Validators list is shared among fields of different form instances	Claude Paroz	nobody	"When forms are created, fields are not new instances, but instead are a deepcopy of the Form class base_fields. If you modified afterwards a form field validators list, it is modified for all other form instances. Example:
{{{
from django import forms
from django.core import validators

class MyForm(forms.Form):
    myfield = forms.CharField(max_length=25)

f1 = MyForm()
f2 = MyForm()

f1.fields['myfield'].validators
>>> [<django.core.validators.MaxLengthValidator object at 0x32b53d0>]

f2.fields['myfield'].validators
>>> [<django.core.validators.MaxLengthValidator object at 0x32b53d0>]

f1.fields['myfield'].validators[0] = validators.MaxValueValidator(12)

f1.fields['myfield'].validators
>>> [<django.core.validators.MaxValueValidator object at 0x3205a90>]

f2.fields['myfield'].validators
>>> [<django.core.validators.MaxValueValidator object at 0x3205a90>]
}}}

This is a problem for me for example to properly resolve #17125."	Bug	closed	Forms	dev	Normal	fixed			Ready for checkin	1	0	0	0	0	0