DjangoTabularInline沒有外鍵問題

在 Django 中，我設定了兩種模型，一種用于產品，另一種用于影像。一個產品可以有多個與之關聯的影像，因此我使用的是一對多模型。

在我的 models.py 我有

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__"

當我運行時，python manage.py makemigrations我收到這個錯誤，我不知道它是什么意思

django.core.management.base.SystemCheckError: SystemCheckError: 系統檢查發現了一些問題：

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

uj5u.com熱心網友回復：

你搞錯了 OneToMany 關系。影像應該有一個產品的外鍵。這樣一個產品可以有多個影像。

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

并洗掉這個：

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

進行遷移，然后在您的 admin.py 中：

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)

標籤：姜戈 django-models

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