Django cannot display model fields to template-CodePudding

I have a model from a package I would like to retreive fields from for the user to my template but am struggling to get this to work as I have done with user model previously:

models

class DeviceManager(models.Manager):

    def devices_for_user(self, user, confirmed=None):

        devices = self.model.objects.filter(user=user)
        if confirmed is not None:
            devices = devices.filter(confirmed=bool(confirmed))

        return devices


class Device(models.Model):

    user = models.ForeignKey(getattr(settings, 'AUTH_USER_MODEL', 'auth.User'), help_text="The user that this device belongs to.", on_delete=models.CASCADE)
    name = models.CharField(max_length=64, help_text="The human-readable name of this device.")
    confirmed = models.BooleanField(default=True, help_text="Is this device ready for use?")

    objects = DeviceManager()

    class Meta:
        abstract = True

    def __str__(self):
        try:
            user = self.user
        except ObjectDoesNotExist:
            user = None

        return "{0} ({1})".format(self.name, user)

view

from django_otp.models import Device

def account(request):

    user = request.user

    device = Device.objects.all()

    context = {"user": user, "device": device}

    return render(request, 'account.html',context)

template

{{ device.name }}
{{ device.confirmed}}

I am getting the folowing error:

AttributeError: Manager isn't available; Device is abstract

I have also tried to change

device = Device.objects.all()

# To

device = DeviceManager.objects.all()

But the produces the following error:

AttributeError: type object 'DeviceManager' has no attribute 'objects'

Help is much apprecaietd in displaying the content from model to my template. Thanks

CodePudding user response：

You can’t actually query abstract models like this. I’d suggest looking at Multi-Table Inheritance

CodePudding user response：

Device.objects.all() will return a queryset of devices, so you may want to rename the variable like devices = Device.objects.all().

In your template you can access name and confirmed attributes per instance in the list like {{ device.0.name }}, {{ device.1.name }}. More likely you'll want a to use a loop

{% for device in devices %}
    {{ device.name }}
{% endfor %}

To use your model manager try devices = Device.objects.devices_for_user(user)