AttributeError: 'GenericRelatedObjectManager' object has no attribute - django

Question

I tried to use generic relation in django project. but it gives attribute error.
Generic relation is between UniqueSourcePresenter and UniqueDbSource
i have an instance of TextTable which has a foreignkey attribute for UniqueSourcePresenter i tried to use reverse relation as self.presenter.texttable in UniqueDbSource's instance method. but it gives error es below
File "/usr/src/app/apps/tableau/models/source.py", line 191, in create_datum
backend | if self.presenter.texttable is not None:
backend | AttributeError: 'GenericRelatedObjectManager' object has no attribute 'texttable'
My models are like follows
class UniqueSourcePresenter(models.Model):
"""
Generic Relation Manager of all types of source
"""
# Below the mandatory fields for generic relation
limit = models.Q(app_label = 'tableau', model = 'UniqueDbSource'.lower()) | models.Q(app_label = 'tableau', model = 'UniqueAPISource'.lower())
content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE, limit_choices_to = limit)
object_id = models.PositiveIntegerField()
content_object = GenericForeignKey()
pass
class DataSource(models.Model):
pass
class UniqueSource(DataSource):
presenter = GenericRelation(UniqueSourcePresenter)
class Meta:
abstract = True
class UniqueDbSource(UniqueSource):
"""
THIS CLASS ADDED TO CONTENTTYPE
"""
def create_datum(self):
""" THIS METHOD CALLED WITH SIGNAL """
d = DatumDb()
d.title = f"{self.title}_datum"
if self.presenter.texttable is not None: ## THIS LINE GIVES ERROR
d.connector = self.presenter.texttable.init_source.data.connector
query = self.presenter.texttable.init_source.data.query
elif self.presenter.charttable is not None:
d.connector = self.charttable.presenter.init_source.data.connector
query = self.charttable.presenter.init_source.data.query
query.pk = None
query.save()
d.query = query
d.save()
self.data = d
pass
def create_presenter(self):
p = UniqueSourcePresenter()
p.content_type = ContentType.objects.get(app_label='tableau', model='UniqueDbSource'.lower())
p.object_id = self.id
p.save()
class Table(models.Model):
unique_source = models.OneToOneField(UniqueSourcePresenter, on_delete=models.CASCADE, null=True, blank=True, related_name="%(class)s")
class Meta:
abstract = True
class TextTable(Table):
pass
def create_unique_source(self):
"""
create a unique source object if created
and add selfs
"""
if self.init_source.content_type.model == 'InitialDbSource'.lower():
us = UniqueDbSource()
us.title = f"{self.title}_unique_source"
us.save()
self.unique_source = us.presenter
elif self.init_source.content_type.model == 'InitialAPISource'.lower():
us = UniqueAPISource()
us.title = f"{self.title}_unique_source"
us.save()
self.unique_source = us.presenter
pass
I added pass words where is not about my problem.
EDIT:
signal.py
#receiver(post_save, sender=UniqueDbSource)
#receiver(post_save, sender=UniqueAPISource)
def after_unique_source_save(sender, instance, created, **kwargs):
if created:
instance.create_datum()
instance.create_presenter()
instance.__class__.objects.filter(id=instance.id).update(
data=DatumDb.objects.all().last())
else:
pass
#receiver(post_save, sender=TextTable)
def after_table_save(sender, instance, created, **kwargs):
if created:
pass
instance.create_unique_source()
pass
if created:
TextTable.objects.filter(id=instance.id).update(
unique_source=UniqueSourcePresenter.objects.all().last()
) # may you can also give a good advice for this line