python - Adding null=True , blank=True in custom model field -


i using custom modelfield language. snippet shown - 

from django.conf import settings  class languagefield(models.charfield):     def __init__(self, *args, **kwargs):         kwargs.setdefault('max_length', 5)         kwargs.setdefault('choices', settings.languages)          super(languagefield, self).__init__(*args, **kwargs)      def get_internal_type(self):         return "charfield"

i want allow null values language. so, know 1 thing have append ((none,"none"),) choices display none option in dropdown. how set null=true , blank=true field.

language=languagefield(null=true,blank=true)

doesnot works.it gives error column 'language' cannot null


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