def __init__(self, *fields, **kwargs):
self.fields = flatten_list(fields)
self.filter = kwargs.get('filter')
def __init__(self, template, *fields, **kwargs):
self.fields = flatten_list(fields)
self.template = template
self.dictionary = kwargs.pop('dictionary', {})
def __init__(self, *fields, **kwargs):
self.fields = flatten_list(fields)
self.initial = kwargs.pop('data', None) is None
self.attrs = kwargs
self.flat_attrs = flatatt(self.attrs)
