Oscar предложение переопределение приложения Преимущества ошибки конфликты функций

Question

Я использую Оскар версии 1.6.4. Я хочу переопределить PercentageDiscountBenefit в oscar.app.offer.benefits.py. Но возникает конфликтная ошибка. Как я могу переопределить эту функцию?

from oscar.core.loading import get_classes

CorePercentageDiscountBenefit, CoreAbsoluteDiscountBenefit = get_classes('offer.benefits', ['PercentageDiscountBenefit', 'AbsoluteDiscountBenefit'])


class PercentageDiscountBenefit(CorePercentageDiscountBenefit):

    def apply(self, basket, condition, offer, discount_amount=None,
              max_total_discount=None):

        print(
            "\n\n\n\n",
            "PRINT SOMETHING",
            "\n\n\n\n",
        )
        return super().apply(basket, condition, offer, discount_amount,
              max_total_discount)


class AbsoluteDiscountBenefit(CoreAbsoluteDiscountBenefit):

    def apply(self, basket, condition, offer, discount_amount=None,
              max_total_discount=None):

        print(
            "\n\n\n\n",
            "PRINT SOMETHING",
            "\n\n\n\n",
        )
        return super().apply(basket, condition, offer, discount_amount,
              max_total_discount)

Журнал ошибок

RuntimeError at /basket/

Conflicting 'percentagediscountbenefit' models in application 'offer': <class 'oscar.apps.offer.benefits.PercentageDiscountBenefit'> and <class 'oscar_apps.offer.benefits.PercentageDiscountBenefit'>.

Request Method:     GET
Request URL:    http://localhost:8000/basket/
Django Version:     1.11.9
Exception Type:     RuntimeError
Exception Value:    

Conflicting 'percentagediscountbenefit' models in application 'offer': <class 'oscar.apps.offer.benefits.PercentageDiscountBenefit'> and <class 'oscar_apps.offer.benefits.PercentageDiscountBenefit'>.

Exception Location:     /home/seyidov/PycharmProjects/Backend/embahome-backend/.venv/lib/python3.5/site-packages/django/apps/registry.py in register_model, line 224
Python Executable:  /home/seyidov/PycharmProjects/Backend/embahome-backend/.venv/bin/python
Python Version:     3.5.2
Python Path:    

['/home/seyidov/PycharmProjects/Backend/embahome-backend',
 '/home/seyidov/PycharmProjects/Backend/embahome-backend',
 '/usr/lib/python35.zip',
 '/usr/lib/python3.5',
 '/usr/lib/python3.5/plat-x86_64-linux-gnu',
 '/usr/lib/python3.5/lib-dynload',
 '/home/seyidov/PycharmProjects/Backend/embahome-backend/.venv/lib/python3.5/site-packages',
 '/home/seyidov/Documents/Programs/pycharm-2018.2.4/helpers/pycharm_matplotlib_backend',
 '/home/seyidov/PycharmProjects/Backend/embahome-backend']

Answer 1

Вы не можете переопределить классы пособий таким образом. Если вы хотите создать пользовательское преимущество, которое применяет другую логику к основным, вам нужно создать свой собственный класс, который является прокси для базовой модели Benefit:

from oscar.apps.offer import models

class CustomPercentageDiscountBenefit(models.Benefit):

    class Meta:
        proxy = True

    def apply(self, basket, condition, offer, discount_amount=None, max_total_discount=None):
        # Apply your benefit here

Это объясняется в более подробно в документации .