Django：AttributeError：<Model>对象没有属性'_meta'

如何解决Django：AttributeError：<Model>对象没有属性'_meta'

注意：- 我已经提到了SO链接和其他教程，但我无法克服此错误。

Django版本：django-3.1

上下文：- 我有一个产品，可以针对p_id（PK）附加多个图像。

待办事项：- 使用django-admin根据产品代码上传多张图片

Error：AttributeError：“ PhotoInline”对象没有属性“ _meta”

models.py

from django.db import models
from django.urls import reverse
from django.utils import timezone

# Create your models here.


class Product(models.Model):
    """
    1. **product**
    | Column-Name  | Type       |
    | ------------ | ---------- |
    | p_id         | NUMERIC-AI |
    | product_name | VARCHAR    |
    | COST         | NUMERIC    |
    """

    p_id = models.AutoField(primary_key=True)
    product_name = models.CharField(max_length=250)
    cost = models.FloatField(default=0)
    created_on = models.DateField(default=timezone.now)

    def get_absolute_url(self):
        return reverse('product:index')

    def __str__(self):
        return self.product_name

    class Meta:
        db_table = 'product'
        verbose_name = 'Product List'


def img_upload_location(p_id,filename):
    p_id = f"{p_id.p_id_id}".replace(" ","-")
    file_name = filename.lower().replace(" ","-")
    return f"pimages/{p_id}/{file_name}"


class Pimage(models.Model):
    """
    | Column-Name | Type    |
    | ----------- | ------- |
    | p_id(FK)    | NUMERIC |
    | img         | VARCHAR |
    """
    p_id = models.ForeignKey(Product,on_delete=models.CASCADE)
    # img = models.ImageField(upload_to='images/')
    img = models.ImageField(upload_to=img_upload_location)

    def get_absolute_url(self):
        return reverse('pimage:index')

    # def __str__(self):
    #     # return Product.objects.get(p_id=f'{self.p_id}').product_name
    #     return f'{self.p_id}'
    def __unicode__(self):
        return self.p_id

    class Meta:
        db_table = 'pimage'
        # Add verbose name
        verbose_name = 'Product Image'

admin.py

from django.contrib import admin
from .models import Product,Pimage
from django.contrib.auth.models import Group

# Register your models here.


class ProdAdmin(admin.ModelAdmin):
    list_display = ('product_name','cost','created_on')


class PhotoInline(admin.StackedInline):
    model = Pimage
    extra = 1
    fk_name = Product.p_id
    # fields = ["p_id","img"]
    # fields = ('p_id','img')


class PimgAdmin(admin.ModelAdmin):
    list_display = ('p_id','img')
    inlines = [PhotoInline]


admin.site.register(Product,ProdAdmin)
admin.site.register(Pimage,PimgAdmin)
admin.site.unregister(Group)