CODEWITHSUNDEEP
django
Anatol
Anatol

Reputation: 2033

Django orm get other foreign key objects from foreign object

I'm puzzled with this probably easy problem.

My Models:

class DiseaseLibrary(models.Model):
    name = models.CharField(max_length=255)
    subadults = models.BooleanField(default=False,blank=True)
    adults = models.BooleanField(default=False, blank=True)

    def __str__(self):
        return self.name

class BoneChangeBoneProxy(models.Model):
    anomalies = models.ForeignKey('DiseaseLibrary', on_delete=models.CASCADE, related_name='anomalies')
    technic = models.ForeignKey('Technic', on_delete=models.CASCADE, related_name='technic_proxy')
    bone_change = models.ForeignKey('BoneChange', blank=True, null=True, on_delete=models.CASCADE, related_name='bone_change_proxy')
    bone = TreeManyToManyField('Bone', related_name='bone_proxy')

From DiseaseLibrary I'd like to get all Objects that link to it via related_name "anomalies". Namely "technic_proxy", "bone_change_proxy", "bone_proxy" which are ForeignKeys to other models.

I would expect to get access by the related name "anomalies" and _set

>>> ds = DiseaseLibrary.objects.all().first()
>>> ds.name
'Some nice name'
>>> ds.anomalies
<django.db.models.fields.related_descriptors.create_reverse_many_to_one_manager.<locals>.RelatedManager object at 0x107fa4f10>
>>> ds.anomalies_set.all()
Traceback (most recent call last):
  File "<console>", line 1, in <module>
AttributeError: 'DiseaseLibrary' object has no attribute 'anomalies_set'
>>>

How can I access all ForeignKey values in model BoneChangeBoneProxy through model DiseaseLibrary?

Upvotes: 1

Views: 118

Answers (1)

willeM_ Van Onsem
willeM_ Van Onsem

Reputation: 476624

Since you have set the related_name='anomalies', you query with:

#      ↓ related_name of the ForeignKey
ds.anomalies.all()

Upvotes: 2

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