Greetings,
I'm trying to create a M2M relation between an abstract base class and a
model that extends the same base.
I have the following code:
#Base object:
class BaseObject(models.Model):
datetime = models.DateTimeField(auto_now_add=True)
shared = models.ManyToManyField('userprofile.UserProfile',
through='models_bases.SharedObject',
symmetrical=False,
related_name="%(app_label)s_%(class)s_related")
class Meta:
abstract = True
<snip>
and the through table:
#Through table:
class SharedObject(models.Model):
from userprofile.models import UserProfile
class Meta:
db_table = 'shared_object'
userprofile = models.ForeignKey(UserProfile)
content_type = models.ForeignKey(ContentType)
object_pk = models.PositiveIntegerField()
shared_object = GenericForeignKey(
ct_field="content_type",
fk_field="object_pk")
datetime = models.DateTimeField(auto_now_add=True)
when I go to do ./manage.py makemigrations I get the following errors:
SystemCheckError: System check identified some issues:
ERRORS:
models_bases.SharedObject: (fields.E336) The model is used as an
intermediate model by 'author.Author.shared', but it does not have a
foreign key to 'Author' or 'UserProfile'.
models_bases.SharedObject: (fields.E336) The model is used as an
intermediate model by 'award.Award.shared', but it does not have a foreign
key to 'Award' or 'UserProfile'.
models_bases.SharedObject: (fields.E336) The model is used as an
intermediate model by 'book.Book.shared', but it does not have a foreign
key to 'Book' or 'UserProfile'.
models_bases.SharedObject: (fields.E336) The model is used as an
intermediate model by 'publisher.Publisher.shared', but it does not have a
foreign key to 'Publisher' or 'UserProfile'.
models_bases.SharedObject: (fields.E336) The model is used as an
intermediate model by 'rlcomments.RLComment.shared', but it does not have a
foreign key to 'RLComment' or 'UserProfile'.
models_bases.SharedObject: (fields.E336) The model is used as an
intermediate model by 'statusposts.StatusPost.shared', but it does not have
a foreign key to 'StatusPost' or 'UserProfile'.
The models are all extensions of BaseObject (including UserProfile).
I have found this ticket: https://code.djangoproject.com/ticket/11760#no1
which I believe to be related.
My question is how do i achieve a M2M with an abstract base that uses a
through table?
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