One way to move queryset items via related_name to their corresponding foreign key item in a different model?

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Assuming you have two models, "ModelA" and "ModelB", where "ModelB" has a foreign key relationship with "ModelA" using a related_name of "items":

class ModelA(models.Model):
    name = models.CharField(max_length=100)

class ModelB(models.Model):
    model_a = models.ForeignKey(ModelA, related_name='items')
    name = models.CharField(max_length=100)

You could move all items from a "ModelA" instance to a new "ModelB" instance using the following code:

# Get the ModelA instance
model_a_instance = ModelA.objects.get(id=<model_a_id>)

# Create a new ModelB instance
new_model_b_instance = ModelB.objects.create(model_a=model_a_instance, name='New ModelB Instance')

# Move items from ModelA to new ModelB instance
new_model_b_instance.items.set(model_a_instance.items.all())

This code first retrieves the desired "ModelA" instance using its ID. It then creates a new "ModelB" instance with a reference to the "ModelA" instance and a name. Finally, it uses the related_name of "items" to retrieve all related items from the "ModelA" instance and assigns them to the "items" field of the new "ModelB" instance using the "set" method.