Django NOT NULL 约束失败：shop_product.user_id

Question

我是 Django 新手，我正在尝试通过练习一些项目来学习，但我遇到了这个问题，

NOT NULL 约束失败：shop_product.user_id

models.py

from django.db import models
from django.conf import settings
from django.core.urlresolvers import reverse
class Category(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL,
                             related_name='category_created')
    name = models.CharField(max_length=200, db_index=True)
    slug = models.SlugField(max_length=200, db_index=True, unique=True)

    class Meta:
        ordering = ('name',)
        verbose_name = 'category'
        verbose_name_plural = 'categories'

    def __str__(self):
        return self.name

class Product(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL,
                             related_name='product_created')
    category = models.ForeignKey(Category, related_name='products')
    name = models.CharField(max_length=200, db_index=True)
    slug = models.SlugField(max_length=200, db_index=True)
    image = models.ImageField(upload_to='products/%Y/%m/%d', blank=True)
    description = models.TextField(blank=True)
    price = models.DecimalField(max_digits=10, decimal_places=2)
    stock = models.PositiveIntegerField()
    available = models.BooleanField(default=True)
    negiotiable = models.BooleanField(default=True)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)
    users_like = models.ManyToManyField(settings.AUTH_USER_MODEL,
                                        related_name='product_liked',
                                        blank=True)

    class Meta:
        ordering = ('name',)
        index_together = (('id', 'slug'),)

    def __str__(self):
        return self.name
    def get_absolute_url(self):
        return reverse('products_detail',
                       args=[self.slug])

这是我的views.py，但不确定我的观点是否有问题，我认为问题必须出在我的模型上......

views.py

from django.views.generic import *
from django.core.urlresolvers import reverse_lazy
from .models import Category, Product

class CategoryList(ListView):
    model = Category

class CategoryDetail(DetailView):
    model = Category

class ProductList(ListView):
    model = Product

class ProductDetail(DetailView):
    model = Product

class ProductCreate(CreateView):
    model = Product
    fields = ("category", 'name', 'image', 'description', 'price', 'stock','available', 'negiotiable')

class ProductUpdate(UpdateView):
    model = Product
    fields = ('name', 'image', 'description', 'price', 'stock','available', 'negiotiable')

class ProductDelete(DeleteView):
    model = Product
    success_url = reverse_lazy('product_list')

请告诉我可以做什么。

Answer 1

为您的产品添加表单，

class ProductForm(forms.ModelForm):

    class Meta:
        model = Product
        fields = "__all__"

另外，您的user 字段必须是null=True 和blank=True。

然后在您的创建视图中，

class ProductCreate(CreateView):
    model = Product
    form_class = ProductForm

    def form_valid(self, form):
        form.instance.user = self.request.user
        form.save()
        return super(ProductCreate, self).form_valid(form)

现在，无论何时创建产品，创建的用户都会被添加为该产品的用户。

Answer 2

将用户添加到列表中：

class ProductCreate(CreateView):
    model = Product
    fields = ["category", 'name', 'image', 'description', 'price','stock','available', 'negiotiable', 'user']

或确保字段必须为 null=true 且空白=True。

class Product(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL,
                         related_name='product_created', null=True, blank=True)