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# models.py | |
class Subscription(models.Model): | |
pass | |
class User(models.Model): | |
subscription = models.ForeignKey(Subscription, null=True, | |
blank=True, related_name='users', | |
on_delete=models.SET_NULL) | |
# admin.py | |
class SubscriptionAdminForm(forms.ModelForm): | |
class Meta: | |
model = Subscription | |
fields = () | |
# users = make_ajax_field(Subscription, 'users', 'user') | |
users = AutoCompleteSelectMultipleField('user', required=False) | |
def __init__(self, *args, **kwargs): | |
super(SubscriptionAdminForm, self).__init__(*args, **kwargs) | |
if self.instance: | |
self.fields['users'].initial = self.instance.users.all() | |
class SubscriptionAdmin(admin.ModelAdmin): | |
form = SubscriptionAdminForm | |
def save_model(self, request, obj, form, change): | |
# TODO: do changes in a transaction | |
super(SubscriptionAdmin, self).save_model(request, obj, form, change) | |
form.fields['users'].initial.update(subscription=None) | |
User.objects.filter( | |
id__in=form.cleaned_data['users']).update(subscription=obj) | |
admin.site.register(Subscription, SubscriptionAdmin) |
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