使用外鍵資料對Django視圖進行分頁

我正在嘗試構建一個簡單的 Django 畫廊，允許將照片添加到相冊。到目前為止一切正常（上傳照片、添加到相冊、對所有照片串列進行分頁、照片詳細資訊/顯示頁面等），直到我嘗試顯示“相冊”頁面。我可以獲取頁面來呈現相冊和所有相關照片，但是如果我嘗試為相冊分頁，事情就會開始變得奇怪。

這是我的模型：

# models.py

class Albums(models.Model):
    id = models.AutoField(primary_key=True, unique=True)
    name = models.CharField(max_length=500)
    slug = models.SlugField(max_length=500, unique=True)
    description = models.TextField(blank=True, null=True)

    def __str__(self):
        return self.name

    def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = slugify(self.name)
        return super().save(*args, **kwargs)


class Photos(models.Model):    
    id = models.AutoField(primary_key=True, unique=True)
    album = models.ForeignKey(
        Albums, on_delete=models.SET_NULL, null=True, blank=True, verbose_name="Album"
    )
    photo = models.ImageField(upload_to="photos/")
    slug = models.CharField(max_length=16, null=False, editable=False) # I know I'm not using a SlugField here; that's on purpose
    title = models.CharField(max_length=500)
    description = models.TextField(blank=True, null=True)
    upload_date = models.DateTimeField(
        default=timezone.now, verbose_name="Date uploaded"
    )
    
    def __str__(self):
        return self.title

    def save(self, *args, **kwargs):
        [...] # stuff to get the image's EXIF data and use that to set the slug
        self.slug = str(datetime.strftime(img_date, "%Y%m%d%H%M%S"))
        [...] # plus a bunch of other stuff that happens on save, not important here
        super(Photos, self).save()

    def delete(self, *args, **kwargs):
        [...] # a bunch of stuff that happens on delete, not important here
        super(Photos, self).delete()

和讓我痛苦的觀點：

# views.py

class PhotoAlbum(DetailView):
    context_object_name = "album"
    model = Albums
    slug_field = "slug"
    template_name = "page.html"

    def get_photos(self, **kwargs):
        # get the integer id of the album
        a = Albums.objects.filter(slug=self.kwargs["slug"])
        a_id = a.values()[0]["id"]
        # get the list go photos in that album
        photos = Photos.objects.all().order_by("-capture_date").filter(album_id=a_id)
        return photos

    def get_context_data(self, **kwargs):
        context = super(PhotoAlbum, self).get_context_data(**kwargs)
        context["photos"] = self.get_photos()
        return context

這些在基本模板中作業......

# album.html
<h2>{{ album.name }}</h2>
<p>{{ album.description }}</p>
<ul>
    {% for photo in photos %}
        <li><a href="{% url 'photo_detail' photo.slug %}">{{ photo.title }}</a></li>
    {% endfor %}
</ul>

...但是如果我嘗試通過更改對照片進行分頁...

photos = Photos.objects.all().order_by("-capture_date").filter(album_id=a_id)

...到...

photos = Paginator(Photos.objects.all().order_by("-capture_date").filter(album_id=a_id), 10)

……我什么也得不到。

在四處搜索時，我看到的幾乎所有與分頁相關的問題都是針對 DRF 的，所以在這里有點碰壁。我在顯示照片到相冊的關系（get_photos()功能）時遇到了各種各樣的麻煩，所以我猜測我的部分問題在于這個。有關如何使其作業的任何建議？

uj5u.com熱心網友回復：

Paginator會給你一個分頁器物件，而不是你正在分頁的物件。要獲取物件，首先需要指定頁面，例如：

paginator = Paginator(Photos.objects.all().order_by("-capture_date").filter(album_id=a_id), 10)
photos = paginator.page(1)

photos此處將包含Photos第 1 頁上的物件。

uj5u.com熱心網友回復：

根據Brian Destura的評論，我回傳并再次開始使用 a ListView，在重新閱讀了 Django 檔案和一些混亂之后，根據我的觀點得出了這個解決方案，基于一些測驗，它對我有用：

class AlbumDetail(ListView):
    context_object_name = "photos"
    template_name = "page.html"
    paginate_by = 6

    def get_queryset(self):
        a = Albums.objects.filter(slug=self.kwargs["slug"])
        a_id = a.values()[0]["id"]
        self.albums = get_object_or_404(Albums, slug=self.kwargs["slug"])
        return Photos.objects.filter(album_id=a_id).order_by("-capture_date")

    def get_context_data(self, **kwargs):
        context = super(AlbumDetail, self).get_context_data(**kwargs)
        context["album"] = self.albums
        return context

uj5u.com熱心網友回復：

視圖.py

class PhotoAlbum(ListView):
    context_object_name = "album"
    model = Albums
    slug_field = "slug"
    template_name = "page.html"
    paginate_by = 5

頁面.html

這是分頁邏輯

{%if is_paginated %}

         {%if page_obj.has_previous %}
          <a style="margin-left: 20px; padding: 10px 20px;" class=" btn btn-primary" href="?page={{page_obj.previous_page_number}}"> ??{{page_obj.num_pages}} previous</a>
          
         {% endif %}

         {%if page_obj.has_next %}
         {% if page_obj.num_pages == 1 %}
             <a style="margin-left: 930px; padding: 10px 28px;" class=" btn btn-primary" href="?page={{page_obj.next_page_number}}">next ??</a>
          {% else %}
            <a style="margin-left: 880px; padding: 10px 28px;" class=" btn btn-primary" href="?page={{page_obj.next_page_number}}">next ??</a>
           {% endif %}
         {% endif %}

       {% endif %} 

標籤：姜戈 django-models django-views django-orm django-分页

上一篇：Django：as_view：如何將cls和initkwargs傳遞給視圖函式

下一篇：Django動態url引數