from django.forms import BoundField, CharField
class PrefixedBoundField(BoundField):
"""
A bound field that passes the form's prefix into the widget's attrs
"""
def as_widget(self, widget=None, attrs=None, only_initial=False):
attrs = {} if attrs is None else attrs.copy()
if self.form.prefix:
attrs.update({"prefix": self.form.prefix})
return super(PrefixedBoundField, self).as_widget(widget, attrs, only_initial)
class PrefixedFormFieldMixin(object):
"""
A form field that binds to a custom bound field class, so we can pass the
form's prefix into the widget's attrs
"""
def get_bound_field(self, form, field_name):
"""
For Django 1.9+
Return a BoundField instance that will be used when accessing the form
field in a template.
"""
return PrefixedBoundField(form, self, field_name)
class OSMFormField(PrefixedFormFieldMixin, CharField):
pass
