class formfield_widget_attrs(object):
    u'''
    Add HTML attributes to Form Fields created by ModelForm:
    Example: <input> tag should have attribute size=60: 

    class MyModel(models.Model):
        name=models.CharField()
        name.formfield=modelutils.formfield_widget_attrs(name.formfield, size='60')
    '''
    def __init__(self, method, **kwargs):
        self.method=method
        self.kwargs=kwargs
    def __call__(self, *args, **kwargs):
        formfield_instance=self.method(*args, **kwargs)
        formfield_instance.widget.attrs.update(self.kwargs)
        return formfield_instance