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pythondjangographene-python

graphene-python doesn't recognize ´content_type´ field

I am making my first attempt to use ´graphene-python´, and I have been able to make it work so far, but I have found that ´graphene-python´ doesn't recognize ForeignKey fields that reference ContentType model.

This is my model:

class ReservationComponent(models.Model):
    reservation = models.ForeignKey(Reservation, on_delete=models.PROTECT, related_name='components', verbose_name=_("Reservation"))
    dertour_bk = models.CharField(null=True, blank=True, max_length=15, verbose_name=_("Dertour Bk"))
    day = models.DateField(verbose_name=_('Day'))
    content_type = models.ForeignKey(ContentType, on_delete=models.PROTECT)
    object_id = models.PositiveIntegerField()
    content_object = GenericForeignKey('content_type', 'object_id')
    comment = models.TextField(null=True, blank=True, verbose_name=_("Comment"))
    is_invoiced = models.BooleanField(default=False, verbose_name=_("Is Invoiced"))

This is my schemas.py:

import graphene
from graphene_django.types import DjangoObjectType
from ReservationsManagerApp.models import Reservation, ReservationComponent
from InvoicesManagerApp.models import Invoice, InvoiceEntry, InvoiceEntryComponent
from PaymentsManagerApp.models import Payment, PaymentReservationComponent

class ReservationType(DjangoObjectType):
    class Meta:
        model = Reservation

class ReservationComponentType(DjangoObjectType):
    class Meta:
        model = ReservationComponent

class InvoiceType(DjangoObjectType):
    class Meta:
        model = Invoice

class InvoiceEntryType(DjangoObjectType):
    class Meta:
        model = InvoiceEntry

class InvoiceEntryComponentType(DjangoObjectType):
    class Meta:
        model = InvoiceEntryComponent

class PaymentType(DjangoObjectType):
    class Meta:
        model = Payment

class PaymentReservationComponentType(DjangoObjectType):
    class Meta:
        model = PaymentReservationComponent

class  Query(object):
    all_reservations = graphene.List(ReservationType)
    all_reservation_components = graphene.List(ReservationComponentType)
    all_invoices = graphene.List(InvoiceType)
    all_invoice_components = graphene.List(InvoiceEntryType)
    all_invoice_entries_components = graphene.List(InvoiceEntryComponentType)
    all_payment = graphene.List(PaymentType)
    all_payment_reservation_components = graphene.List(PaymentReservationComponentType)

    def resolve_all_reservations(self, info, **kwargs):
        return Reservation.objects.all()

    def resolve_all_reservation_components(self, info, **kwargs):
        return ReservationComponent.objects.select_related('reservation').all()

    def resolve_all_invoice_entries_components(self, info, **kwargs):
        return InvoiceEntryComponent.objects.select_related('reservation_component').all()

    def resolve_all_payment_reservation_components(self, info, **kwargs):
        return PaymentReservationComponent.objects.select_related('reservation_component').all()

And, in this image, you can see that the field ´content_type´ of model ´ReservationComponent´ is not accepted by graphene-python, even when it exists in the model.

enter image description here

I don't know if I am missing any setting, or something.

Solution

  • It is because you do not have DjangoObjectType for django's ContentType model.

    You can create it by,

    from graphene_django import DjangoObjectType
from django.contrib.contenttypes.models import ContentType

class ContentObjectType(DjangoObjectType):

    class Meta:
        model = ContentType

    As per documentation, you must create a type for each models subclassing DjangoObjectType