外鍵 django - 數據庫關系

Question

我有一個 model 產品香水，產品有不同的數量和價格。 我需要為每個渲染數量和價格，但我得到“'function' object has no attribute 'prices'”

有任何想法嗎？ 我很感激任何建議

看法：

from django.shortcuts import render

from django.views.generic import View, TemplateView
from products.models import Perfume, Pricing



def getIndex(request):
    
    
    perfumes = Perfume.objects.all
    thePrice= perfumes.prices.all()
    
    
   

    return render(request, 'index.html', {'perfumes': perfumes, 'thePrice':thePrice})

Model

from django.conf import settings
from django.db import models
from django.utils import timezone


class Perfume(models.Model):
  
    genderChoice = (
        ('unisex','unisex'), ('male', 'male'), ('female', 'female'))
         
   
         
    name = models.CharField(max_length=50, default='')
    brand = models.CharField(max_length=40, default='')
    gender = models.CharField(max_length=7, choices=genderChoice, default='unisex')
    

    description = models.TextField()
    image = models.ImageField(upload_to='images/product_image')
    created = models.DateField()
    author =models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    active = models.BooleanField(default=False)
    show_for_consumer = models.BooleanField(default=False)

    def __str__(self):
        return self.name        


class Pricing(models.Model):
    product =models.ForeignKey(Perfume, on_delete=models.CASCADE,related_name='prices')
    
     
    price= models.DecimalField(max_digits=10, decimal_places=2)
    volume= models.DecimalField(max_digits=10, decimal_places=2)
    def __str__(self):
         return 'Perfume {} - Price{} - Volume {}'.format(self.product.name,self.price, self.volume)

Answer 1

首先，您需要更正獲取香水查詢集時缺少的()

perfumes = Perfume.objects.all()

這thePrice = perfumes.prices.all()是不正確的。 您必須為每種香水都這樣做，而不是為queryset查詢集。

由於Perfume和Pricing具有一對多的關系，您可以直接訪問每個香水實例的價格。 這樣你只需要傳遞香水queryset

def getIndex(request):
    perfumes = Perfume.objects.all()
    return render(request, 'index.html', {'perfumes': perfumes})

最后，在您的模板中，您可以像這樣調用價格

{% for product in perfumes %}
  ...
  {% for p in product.prices.all %}
    <option>{{p.volume}}ml - {{p.price}}$ </option>
  ...
  {% endfor %}
{% endfor %}