Widget to render ArrayField in Django. Written by Brad Montgomery.

forms.py

from django.utils.datastructures import MultiValueDict

class ArrayFieldSelectMultiple(forms.SelectMultiple):
    """This is a Form Widget for use with a Postgres ArrayField. It implements
    a multi-select interface that can be given a set of `choices`.

    You can provide a `delimiter` keyword argument to specify the delimeter used.
    """
    def __init__(self, *args, **kwargs):
        # Accept a `delimiter` argument, and grab it (defaulting to a comma)
        self.delimiter = kwargs.pop('delimiter', ',')
        super().__init__(*args, **kwargs)

    def value_from_datadict(self, data, files, name):
        if isinstance(data, MultiValueDict):
            # Normally, we'd want a list here, which is what we get from the
            # SelectMultiple superclass, but the SimpleArrayField expects to
            # get a delimited string, so we're doing a little extra work.
            return self.delimiter.join(data.getlist(name))

        return data.get(name)

    def get_context(self, name, value, attrs):
        return super().get_context(name, value.split(self.delimiter), attrs)

Updated for Django v2.1 (Python 3)

This was a life saver! Thanks Stephane But i needed to add

from django.utils.datastructures import MultiValueDict

Thanks

@mattfield11 Thank you. Import added