from django.db import models
from django.contrib.postgres.fields import ArrayField


class WhateverModel(models.Model):
    WHATEVER_CHOICE = '1'
SAMPLE_CHOICES = (WHATEVER_CHOICE, 'one'),
choices = ArrayField(models.CharField(choices=SAMPLE_CHOICES, max_length=2,
    blank=True, default=WHATEVER_CHOICE))
Django Model MultipleChoice