content_type = models.ForeignKey(
    ContentType,
    on_delete=models.CASCADE
)

object_id = models.PositiveIntegerField()

content_object = GenericForeignKey('content_type', 'object_id')

class Meta:
    abstract = True

class Discussion(GenericModel):

author = models.ForeignKey(
    'auth.User'
)

name = models.CharField(
    max_length=200
)

description = models.TextField()

created_data = models.DateTimeField(
    default=timezone.now
)

comments = models.ManyToManyField(
    'discussions.Comment',
    default='',
    blank=True,
    related_name='discussion_comments'
)

is_closed = models.BooleanField(
    default=False
)

visits = models.IntegerField(
    default=0
)

def __str__(self):
    return self.name

COMMON_FIELDS = (
'pk',
'author',
'name',
'description',
'created_data',
'comments',
'is_closed',
'visits'

class Meta:
    model = Discussion
    fields = COMMON_FIELDS

Could not resolve URL for hyperlinked relationship using view name "contenttype-detail". You may have failed to include the related model in your API, or incorrectly configured the `lookup_field` attribute on this field.