Django：列出页面中每个类别的产品

Question

我有几个类别，我想按以下格式列出每个类别的产品（类别是产品的 FK）：

第 1 类

一堆产品

....

类别 N

一堆产品

我尝试了很多方法，但到目前为止，我只获得了要在我的 HTML 中显示的类别而不是产品。

模型.py

class Category(models.Model):
    title = models.CharField(max_length=225)
    slug = models.SlugField(unique=True, blank=True, null=True)

    def __str__(self):
        return self.title

    def get_absolute_url(self):
        return reverse('category_detail', kwargs={'slug': self.slug})

    @property
    def get_products(self):
         return Products.objects.filter(category=self.title)

class Products(models.Model):
    title = models.CharField(max_length=225)
    image = models.ImageField(upload_to=upload_image_path, null=True, blank=True)
 blank=True, on_delete=models.CASCADE)
    categories = models.ForeignKey(Category, related_name='Category', blank=True, on_delete=models.CASCADE) #this
    gender = models.CharField(max_length=20, choices=GENDER_CHOICES, default="male")

    objects = ProductManager()

    def get_absolute_url(self):
        return reverse('product_detail', args=(self.id,))

    def __str__(self):
        return self.title

views.py

def categories_m(request):
    query_Set = models.Category.objects.all()
    page = request.GET.get('page', 1)
    paginator = Paginator(query_Set, 20)
    try:
        cat = paginator.page(page)
    except PageNotAnInteger:
        cat = paginator.page(1)
    except EmptyPage:
        cat = paginator.page(paginator.num_pages)
    return render(request, 'products/categories.html', {'categories': cat})

html

{% extends 'base.html' %}

{% block content %}
{% for category in categories %}
    <h1>{{ category }}</h1>
    {% for product in categories.get_products %}
        <p>{{ product }}</p>
    {% endfor %}
{% endfor %}
{% endblock %}

Answer 1

在您的模板中应该是 category 而不是 categories。并在您的模型中按类别标题过滤产品。

@property
def get_products(self):
     return Products.objects.filter(categories__title=self.title)

{% extends 'base.html' %}

    {% block content %}
        {% for category in categories %}
        <h1> {{category}} </h1>

        {% for product in category.get_products %}
            <p> {{product}} </p>
        {% endfor %}

        {% endfor %}
    {% endblock %}

Answer 2

您可以从您的字段中删除 related_name 属性

class Products(models.Model):
    categories = models.ForeignKey(Category, blank=True, on_delete=models.CASCADE)

然后在你的模板中你可以使用category.products_set.all

{% extends 'base.html' %}

    {% block content %}
    {% for category in categories %}
        <h1>{{ category }}</h1>
        {% for product in category.products_set.all %}
            <p>{{ product }}</p>
        {% endfor %}
    {% endfor %}
    {% endblock %}