Meilleur widget Admin ArrayField?

Je ne prends aucun crédit pour cela ( source originale), mais une option encore plus facile est la sous-classe ArrayField sur le modèle et Outrepasser le widget administrateur par défaut. Une implémentation de base suit (testée en Django 1.9 et 1.10):

models.py

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


class ChoiceArrayField(ArrayField):
    """
    A field that allows us to store an array of choices.
    Uses Django's Postgres ArrayField
    and a MultipleChoiceField for its formfield.
    """

    def formfield(self, **kwargs):
        defaults = {
            'form_class': forms.MultipleChoiceField,
            'choices': self.base_field.choices,
        }
        defaults.update(kwargs)
        # Skip our parent's formfield implementation completely as we don't
        # care for it.
        # pylint:disable=bad-super-call
        return super(ArrayField, self).formfield(**defaults)


FUNCTION_CHOICES = (
    ('0', 'Planning'),
    ('1', 'Operation'),
    ('2', 'Reporting'),
)

class FunctionModel(models.Model):
    name = models.CharField(max_length=128, unique=True)
    function = ChoiceArrayField(
        base_field=models.CharField(max_length=256, choices=FUNCTION_CHOICES),
        default=list)

django-select2 offre un moyen de rendre l' ArrayField en utilisant Select2. Dans leur documentation, l'exemple est pour ArrayField:

http://django-select2.readthedocs.io/en/latest/django_select2.html#django_select2.forms.Select2TagWidget

pour rendre les valeurs déjà sélectionnées:

class ArrayFieldWidget(Select2TagWidget):

    def render_options(self, *args, **kwargs):
        try:
            selected_choices, = args
        except ValueError:  # Signature contained `choices` prior to Django 1.10
            choices, selected_choices = args
        output = ['<option></option>' if not self.is_required and not self.allow_multiple_selected else '']
        selected_choices = {force_text(v) for v in selected_choices.split(',')}
        choices = {(v, v) for v in selected_choices}
        for option_value, option_label in choices:
            output.append(self.render_option(selected_choices, option_value, option_label))
        return '\n'.join(output)

    def value_from_datadict(self, data, files, name):
        values = super().value_from_datadict(data, files, name)
        return ",".join(values)

Pour ajouter le widget à votre formulaire:

class MyForm(ModelForm):

    class Meta:
        fields = ['my_array_field']
        widgets = {
            'my_array_field': ArrayFieldWidget
        }