Django admin choice field

Question

I have a model that has a CharField and in the admin I want to add choices to the widget. The reason for this is I\'m using a proxy model and there are a bunch of models tha

Answer 1

Below a solution that works immediately with Postgres' special ArrayField:

# models.py

class MyModel(models.Model):
    class Meta:
        app_label = 'appname'

    name = models.CharField(max_length=1000, blank=True)
  
    ROLE_1 = 'r1'
    ROLE_2 = 'r2'
    ROLE_3 = 'r3'

    ROLE_CHOICES = (
        (ROLE_1, 'role 1 name'),
        (ROLE_2, 'role 2 name'),
        (ROLE_3, 'role 3 name'),
    )

    roles = ArrayField(
        models.CharField(choices=ROLE_CHOICES, max_length=2, blank=True),
        default=list
    )

# admin.py

class MyModelForm(ModelForm):
    roles = MultipleChoiceField(choices=MyModel.ROLE_CHOICES, widget=CheckboxSelectMultiple)


@admin.register(MyModel)
class MyModelAdmin(admin.ModelAdmin):
    form = MyModelForm
    list_display = ("pk", "name", "roles")

(Django 2.2)