AttributeError:“AttributeValueAdmin”对象没有属性“URL”

Question

我为属性和产品属性设计了一个表。一个属性可以有许多值。 例如，一个名为“颜色”的属性可以具有黑色、白色、灰色、栗色等值 这是我这样设计的一张桌子

然而，当注册到管理员时，我得到了AttributeError: 'AttributeValueAdmin' object has no attribute 'urls' 错误

class Attribute(models.Model):
    name = models.CharField(max_length=30, unique=True)
    slug = models.SlugField(max_length=250, unique=True)

    class Meta:
        verbose_name = "Attribute"
        verbose_name_plural = "Attributes"

    def __str__(self):
        return self.name


class ProductAttribute(SortableModel):
    product = models.ForeignKey(Product,
                                related_name="productattribute",
                                null=True,
                                on_delete=models.CASCADE)
    attribute = models.ManyToManyField(
        Attribute,
        through="AttributeValue"
    )

    class Meta:
        ordering = ("sort_order",)
        verbose_name = "Product Attribute"
        verbose_name_plural = "Product Attributes"



class AttributeValue(SortableModel):
    name = models.CharField(max_length=250)
    value = models.CharField(max_length=100, blank=True, default="")
    slug = models.SlugField(max_length=255)
    productattribute = models.ForeignKey(ProductAttribute,
                                         null=True,
                                         related_name='productattribute',
                                         on_delete=models.CASCADE)
    attribute = models.ForeignKey(
        Attribute, related_name="values", on_delete=models.CASCADE
    )

    class Meta:
        ordering = ("sort_order", "id")
        unique_together = ("slug", "attribute")

    def __str__(self) -> str:
        return self.name

管理员

class ProductAdmin(admin.ModelAdmin):
    model = models.Product
    prepopulated_fields = {'slug': ('name',), }


class AttributeValueAdmin(admin.TabularInline):
    model = models.AttributeValue
    extra = 2


class AttributeAdmin(admin.ModelAdmin):
    model = models.Attribute
    prepopulated_fields = {'slug': ('name',), }


class ProductAttributeAdmin(admin.ModelAdmin):
    # model = models.ProductAttribute
    inlines = (AttributeValueAdmin, )


admin.site.register(models.Attribute, AttributeAdmin)
admin.site.register(models.AttributeValue, AttributeValueAdmin)
admin.site.register(models.ProductAttribute, ProductAttributeAdmin)

Answer 1

根据django docs on admin，第一步是通过像您所做的那样为AttributeValue表子类化内联类来显示中间模型

class AttributeValueInline(admin.TabularInline):
    model = models.AttributeValue
    extra = 2

第二步是为Attribute和ProductAttribute模型创建管理视图

class AttributeAdmin(admin.ModelAdmin):
    inlines = (AttributeValueInline, )
    prepopulated_fields = {'slug': ('name',), }


class ProductAttributeAdmin(admin.ModelAdmin):
    inlines = (AttributeValueInline, )

第三步是注册Attribute和ProductAttribute模型

admin.site.register(models.Attribute, AttributeAdmin)
admin.site.register(models.ProductAttribute, ProductAttributeAdmin)

您不需要注册AttributeValue模型，因为您可以从Attribute或ProductAttribute表中创建/编辑AttributeValue内联

作为参考，您可以阅读django文档

https://docs.djangoproject.com/en/3.0/ref/contrib/admin/#working-with-many-to-many-intermediary-models