Django Tabular Inline没有外键问题

Question

在Django中，我设置了两个模型，一个用于产品，一个用于图像。一个产品可以有多个与之相关的图像，因此我使用的是一对多模型。

在我的models.py中有

from django.db import models
from django.db.models.fields import CharField
# Create your models here.
class Image(models.Model):
image = models.ImageField()
imageMetaKeyWords = models.CharField("Meta keywords for SEO", max_length = 255,
help_text = "Comma delimited words for SEO")
imageMetaDescription = models.CharField("Meta description", max_length = 255,
help_text = "Content for image meta tag description")
defaultImage = models.BooleanField(default= False)
class Product(models.Model):
productName = models.CharField(max_length=200)
productDescription = models.TextField(blank=True)
productPrice = models.DecimalField(max_digits=9, decimal_places=0, default=0)
productAvailable = models.BooleanField(default = True)
productCreated_at = models.DateTimeField(auto_now_add = True)
productUpdated_at = models.DateTimeField(auto_now = True)
productSlug = models.SlugField(max_length = 255, unique = True,
help_text = "Unique text for url created from product name")
productMetaKeywords = models.CharField("Meta keywords for SEO", max_length = 255,
help_text ="Comma delimited words for SEO")
productMetaDescription = models.CharField("Meta description", max_length = 255,
help_text="Content for meta tag description")

productImages = models.ForeignKey(Image, on_delete=models.CASCADE)
class Meta:
db_table = 'products'
ordering = ['-productName']
def __str__(self):
return self.productName

在admin.py

from django.contrib import admin
from .models import Product, Image
from .forms import ProductAdminForm
# Register your models here.
class ImageTabularInline(admin.TabularInline):
model = Product
class ProductAdmin(admin.ModelAdmin):
form = ProductAdminForm
inlines = [ImageTabularInline,]

class Meta:
model = Product
admin.site.register(Product, ProductAdmin)
admin.site.register(Image)

在forms.py中我有

from django import forms
from .models import Product
class ProductAdminForm(forms.ModelForm):
class Meta:
model = Product
fields = "__all__"

当我运行python manage.py makemigrations时，我收到这个错误，我不知道它是什么意思

django.core.management.base。SystemCheckError: SystemCheckError:系统检查发现了一些问题:

ERRORS:
<class 'products.admin.ImageTabularInline'>: (admin.E202) 'products.Product' has no ForeignKey to 'products.Product'.

Answer 1

你理解错了onetmany的关系。图像应该有一个外键到产品。这样一个产品就可以有多个图像。

class Image(models.Model):
image = models.ImageField()
imageMetaKeyWords = models.CharField("Meta keywords for SEO", max_length = 255,
help_text = "Comma delimited words for SEO")
imageMetaDescription = models.CharField("Meta description", max_length = 255,
help_text = "Content for image meta tag description")
defaultImage = models.BooleanField(default= False)
product = models.ForeignKey("Product", on_delete=models.CASCADE, related_name="images") 
#if you want to get the product's images you can call product.images

并删除此:

productImages = models.ForeignKey(Image, on_delete=models.CASCADE)

执行迁移，然后在admin.py:

from django.contrib import admin
from .models import Product, Image
from .forms import ProductAdminForm
# Register your models here.
class ImageTabularInline(admin.TabularInline):
model = Image
class ProductAdmin(admin.ModelAdmin):
form = ProductAdminForm
inlines = [ImageTabularInline,]

class Meta:
model = Product
admin.site.register(Image)
admin.site.register(Product, ProductAdmin)