如何通过/through_ fields.E339修复django模型中的PEP字段？

Question

我正在尝试通过中间模型将漏洞cve模型与产品联系起来，以基于产品/ cve链接/匹配每个漏洞

class Vulnerability(models.Model):
    cveid = models.CharField(max_length=32, null=True, blank=True)
    affected_products = models.ManyToManyField(
        Product,
        through='ProductVulnerability',
        through_fields=("product", "vulnerability")
    )


class ProductVulnerability(models.Model):
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    vulnerability = models.ForeignKey(Vulnerability, on_delete=models.CASCADE)
    
    class Meta:
        unique_together = [("product", "vulnerability")]

service         | ERRORS:
service         | api.Vulnerability.affected_products: (fields.E339) 'ProductVulnerability.product' is not a foreign key to 'Vulnerability'.
service         |   HINT: Did you mean one of the following foreign keys to 'Vulnerability': vulnerability?
service         | api.Vulnerability.affected_products: (fields.E339) 'ProductVulnerability.vulnerability' is not a foreign key to 'Product'.
service         |   HINT: Did you mean one of the following foreign keys to 'Product': product?
service         | SystemCheckError: System check identified some issues:

Answer 1

正如documented和As HINT所建议的那样

through_fields接受二元组(' field1 '，' field2 ')，其中field1是定义字段的模型的外键名称，field2是目标模型的外键名称。

所以在你的情况下

affected_products = models.ManyToManyField(
    Product,
    through='ProductVulnerability',
    through_fields=("vulnerability", "product")
)