forms.py 使用外键模型创建表单。商店应该只能将产品添加到自己的商店。（姜戈）

Question

商店只能为自己创建产品，不能为其他商店创建产品。

models.py

from django.db import models
from django.contrib.auth.models import User
from django.urls import reverse
from django.utils.text import slugify
from django.dispatch import receiver

class Store(models.Model):
    name = models.CharField(max_length=100)
    owner = models.ForeignKey(User, on_delete=models.CASCADE)
    slug = models.SlugField(unique=True, blank=False, null=False)


class Product(models.Model):
    store = models.ForeignKey(Store, on_delete=models.CASCADE, null=False, blank=False)
    name = models.CharField(max_length=200)
    price = models.FloatField()
    image = models.ImageField(null=True, blank=True)

forms.py

from .models import Store, Product
from django import forms

class AddProductForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        user = kwargs.pop('user', None)
        super().__init__(*args, **kwargs)

        # restrict the queryset of 'Store'
        self.fields['store'].queryset = self.fields['store'].queryset.filter(
            owner=user)

    class Meta:
        model = Product
        fields = ('store', 'name', 'price', 'image',)

        widgets = {
            'name': forms.TextInput(attrs={'class': 'form-control', 'placeholder': 'Name of your product'}),
            'price': forms.NumberInput(attrs={'class': 'form-control', 'placeholder': 'Price of your product'}),
            'image': forms.FileInput(attrs={'class': 'form-control'}),
        }

在我的 views.py 文件中，我尝试了不同的东西，但没有任何效果，所以我把它放在那里，这样你就知道我尝试了什么。

views.py

from django.shortcuts import render, redirect
from django.urls.base import reverse
from django.contrib.auth.models import User, Group
from django.contrib.auth import authenticate, login
from .models import Product, Store
from django.views.generic import ListView, DetailView, CreateView, UpdateView, DeleteView


class AddProductView(CreateView):

    model = Product
    form_class = AddProductForm
    template_name = 'app1/add-product.html'



    def get_form_kwargs(self):
        kwargs = super().get_form_kwargs()
        kwargs['user'] = self.request.user
        return kwargs


    def form_valid(self, form):
        form.instance.owner = self.request.user
        if Store.objects.filter(owner=self.request.user).exists():
            self.store = Store.objects.filter(Store__owner=self.request.user)

            form = form.cleaned_data
            form['store'] = self.store
            
            return super().form_valid(form)
            
        else:
            return super().form_invalid(form)

    

    
    def form_invalid(self, form):
        return super().form_invalid(form)

    
    def get_context_data(self, **kwargs):
        pass

    
    def get_success_url(self):
        return reverse('store', kwargs={'slug': self.object.store.slug})

我不知道 google 有什么用，我试过这些主题：

Answer 1

只是 views.py

中的导入示例

from django.shortcuts import render, redirect
from django.urls.base import reverse
from django.contrib.auth.models import User, Group
from django.contrib.auth import authenticate, login
from .models import Product, Store
from django.views.generic import ListView, DetailView, CreateView, UpdateView, DeleteView

在views.py中添加这个

class AddProductView(CreateView):

    model = Product
    form_class = AddProductForm
    template_name = 'app1/add-product.html'



  # add this code |
  #               V

    def get_initial(self):
        if Store.objects.filter(owner=self.request.user).exists():
            user = self.request.user
            initial = super(AddProductView, self).get_initial()
            initial['store'] = Store.objects.get(owner=user)
            return initial    


    ...

确保根据您的型号名称和需求对其进行编辑。

如果你想隐藏它，看看这个postChange a Django form field to a hidden field

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