Python 铁路超高按类别过滤

我正在尝试建立一个分类过滤系统。每当我尝试单击我的一个类别时，它总是显示所有产品，但我想显示过滤类别列表。如果我单击智能手机，它将仅显示智能手机类别产品

这是我的模型。Py:

from django.db import models

# Create your models here.


class Category(models.Model):
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name

    @staticmethod   
    def get_categories():
        return Category.objects.all()


class Brand(models.Model):
    name= models.CharField(max_length=100)

    def __str__(self):
        return self.name

    def get_brands():
        return Brand.objects.all()  

class Product(models.Model):
    name = models.CharField(max_length=100)
    category = models.ForeignKey(Category, on_delete=models.CASCADE, default='UNCATEGORIZED')
    brand = models.ForeignKey(Brand, on_delete=models.CASCADE, default='NoBrand')
    price = models.FloatField()


    @staticmethod
    def get_all_products():
        return Product.objects.all()


    @staticmethod
    def get_products_by_category(category_id):
        if category_id:
            return Product.objects.filter(category=category_id)
        else:
            return Product.get_all_products()

以下是我的视图.py：

from django.shortcuts import render
from .models import *
# Create your views here.


def index(request):
    products = None
    cats = Category.get_categories()
    brands = Brand.get_brands()

    categoryID = request.GET.get('category')

    if categoryID:
        products = Product.get_products_by_category(categoryID)
    else:
        products = Product.get_all_products()

    args = {
    'products':products,
    'cats': cats,
    'brands': brands
    }
    return render(request, 'Home/index.html', args)

---

请帮助我，我在这里很困惑，也被卡住了：（

在您的视图中尝试此过滤器。py

if categoryID:
        
  products=Product.objects.filter(category__name=categoryID)
        
else:
        products = Product.get_all_products()

---

以下是您的问题的可能答案。我稍微修改了models.py和views.py文件。结果如下：

from django.db import models

class Category(models.Model):
    name = models.CharField(max_length=100)
    
    slug = models.SlugField(max_length=100, unique=True)
    
    class Meta:
        ordering = ('name',)
        verbose_name = 'cat'
        verbose_name_plural = 'cats'
        
    def __str__(self):
        return self.name

class Brand(models.Model):
    name = models.CharField(max_length=100)
    
    slug = models.SlugField(max_length=100, unique=True)
    
    class Meta:
        ordering = ('name',)
        verbose_name = 'brand'
        verbose_name_plural = 'brands'
    
    def __str__(self):
        return self.name
    
class Product(models.Model):
    name = models.CharField(max_length=100, db_index=True)
    category = models.ForeignKey(Category, on_delete=models.CASCADE, default='UNCATEGORIZED')
    brand = models.ForeignKey(Brand, on_delete=models.CASCADE, default='NoBrand')
    price = models.FloatField()
    slug = models.SlugField(max_length=100, db_index=True)
    
    class Meta:
        ordering = ('name',)
        index_together = (('id', 'slug'),)
        
    def __str__(self):
        return self.name

通过创建一个唯一的slug字段，您就创建了一个索引。现在让我们看看修改后的views.py文件：

from django.shortcuts import render, get_object_or_404
from .models import *

def product_list(request, cat_slug=None):
    cat = None
    cats = Category.objects.all()
    brand = None
    brands = Brand.objects.all()
    if cat_slug:
        cat = get_object_or_404(Category, slug=cat_slug)
        products = products.filter(category=cat)
    
    args = {'products': products,
            'cats': cats,
            'cat': cat,
            'brands': brands
            }
    return render(request, 'Home/index.html', args)

我们使用可选的cat_slug参数，可以根据给定的类别选择性地筛选产品。如果您想按品牌筛选，想法也是一样的。只是不要忘记在您的上下文中添加一个品牌。

您如何准确构建到按类别筛选的视图的链接。