Object has no attribute _state

Question

I\'m developing Django application, and I have following error

\'Sheep\' object has no attribute _state

My models are constructed like this

Answer 1

Django docs recommend against you to use __init__ method in models:

You may be tempted to customize the model by overriding the __init__ method. If you do so, however, take care not to change the calling signature as any change may prevent the model instance from being saved. Rather than overriding __init__, try using one of these approaches:

1. Add a classmethod on the model class
2. Add a method on a custom manager (usually preferred)