class Video(models.Model):    status_choice = (        (0, u‘下线‘),        (1, u‘上线‘),    )    level_choice = (        (1, u‘初级‘),        (2, u‘中级‘),        (3, u‘高级‘),    )    status = models.IntegerField(verbose_name=‘状态‘, choices=status_choice, default=1)    level = models.IntegerField(verbose_name=‘级别‘, choices=level_choice, default=1)    classification = models.ForeignKey(‘Classification‘, null=True, blank=True)    weight = models.IntegerField(verbose_name=‘权重（按从大到小排列）‘, default=0)    title = models.CharField(verbose_name=‘标题‘, max_length=32)    summary = models.CharField(verbose_name=‘简介‘, max_length=32)    img = models.ImageField(verbose_name=‘图片‘, upload_to=‘./static/images/Video/‘)    href = models.CharField(verbose_name=‘视频地址‘, max_length=256)    create_date = models.DateTimeField(auto_now_add=True)    class Meta:        db_table = ‘Video‘        verbose_name_plural = u‘视频‘    def __str__(self):        return self.title

class Direction(models.Model):    weight = models.IntegerField(verbose_name=‘权重（按从大到小排列）‘, default=0)    name = models.CharField(verbose_name=‘名称‘, max_length=32)    classification = models.ManyToManyField(‘Classification‘)    class Meta:        db_table = ‘Direction‘        verbose_name_plural = u‘方向（视频方向）‘    def __str__(self):        return self.name

class Classification(models.Model):    weight = models.IntegerField(verbose_name=‘权重（按从大到小排列）‘, default=0)    name = models.CharField(verbose_name=‘名称‘, max_length=32)    class Meta:        db_table = ‘Classification‘        verbose_name_plural = u‘分类（视频分类）‘    def __str__(self):        return self.name

from django.conf.urls import urlfrom django.contrib import adminfrom app01 import viewsurlpatterns = [    url(r‘^admin/‘, admin.site.urls),    url(r‘^video-(?P<direction_id>\d+)-(?P<classification_id>\d+)-(?P<level_id>\d+).html‘, views.video),]

    <h3>选择：</h3>    <div>        {% action_all current_url 1 %} :        {% for item in direction_list %}             {% action current_url item %}        {% endfor %}    </div>    <div>        {% action_all current_url 2 %} :        {% for item in class_list %}            {% action current_url item %}        {% endfor %}    </div>    <div>        {% action_all current_url 3 %} :        {% for item in level_list %}            {% action current_url item %}        {% endfor %}    </div>

@register.simple_tagdef action_all(current_url,index):    """    获取当前url，video-1-1-2.html    :param current_url:    :param item:    :return:    """    url_part_list = current_url.split(‘-‘)    if index == 3:        if url_part_list[index] == "0.html":            temp = "<a href=http://www.mamicode.com/‘%s‘ class=‘active‘>全部"        else:            temp = "<a href=http://www.mamicode.com/‘%s‘>全部"        url_part_list[index] = "0.html"    else:        if url_part_list[index] == "0":            temp = "<a href=http://www.mamicode.com/‘%s‘ class=‘active‘>全部"        else:            temp = "<a href=http://www.mamicode.com/‘%s‘>全部"        url_part_list[index] = "0"    href = ‘-‘.join(url_part_list)    temp = temp % (href,)    return mark_safe(temp)@register.simple_tagdef action(current_url, item,index):    # videos-0-0-1.html    # item: id name    # video-   2   -0-0.html    url_part_list = current_url.split(‘-‘)     if index == 3:        if str(item[‘id‘]) == url_part_list[3].split(‘.‘)[0]:　　#如果当前标签被选中             temp = "<a href=http://www.mamicode.com/‘%s‘ class=‘active‘>%s"        else:            temp = "<a href=http://www.mamicode.com/‘%s‘>%s"         url_part_list[index] = str(item[‘id‘]) + ‘.html‘ #拼接对应位置的部分url    else:        if str(item[‘id‘]) == url_part_list[index]:            temp = "<a href=http://www.mamicode.com/‘%s‘ class=‘active‘>%s"        else:            temp = "<a href=http://www.mamicode.com/‘%s‘>%s"         url_part_list[index] = str(item[‘id‘])     ur_str = ‘-‘.join(url_part_list)  #拼接整体url    temp = temp %(ur_str, item[‘name‘]) #生成对应的a标签    return mark_safe(temp)  #返回安全的html

    <h3>视频：</h3>    {% for item in video_list %}        <a class="item" href="{{ item.href }}">            <img src="/{{ item.img }}" width="300px" height="400px">            <p>{{ item.title }}</p>            <p>{{ item.summary }}</p>        </a>    {% endfor %}

def video(request,*args,**kwargs):    print(kwargs)    # 当前请求的路径    request_path = request.path    # 从数据库获取视频时的filter条件字典    q = {}    # 状态为审核通过的    q[‘status‘] = 1    # 获取url中的视频分类id    class_id = int(kwargs.get(‘classification_id‘))    # 从数据库中获取所有的视频方向（包括视频方向的id和name）    direction_list = models.Direction.objects.all().values(‘id‘,‘name‘)    # 如果视频方向是0    if kwargs.get(‘direction_id‘) == ‘0‘:        # 方向选择全部        # 方向id=0，即获取所有的视频分类（包括视频分类的id和name）        class_list = models.Classification.objects.all().values(‘id‘, ‘name‘)        # 如果视频分类id也为0，即全部分类，那就什么都不用做，因为已经全取出来了        if kwargs.get(‘classification_id‘) == ‘0‘:            pass        else:            # 如果视频分类不是全部，过滤条件为视频分类id在[url中的视频分类id]            q[‘classification_id__in‘] = [class_id,]    else:        print(‘方向不为0‘)        # 方向选择某一个方向，        # 如果分类是0        if kwargs.get(‘classification_id‘) == ‘0‘:            print(‘分类为0‘)            # 获取已选择的视频方向            obj = models.Direction.objects.get(id=int(kwargs.get(‘direction_id‘)))            # 获取该方向的所有视频分类            class_list = obj.classification.all().values(‘id‘, ‘name‘)            # 获取所有视频分类对应的视频分类id            id_list = list(map(lambda x: x[‘id‘], class_list))            # 过滤条件为视频分类id in [该方向下的所有视频分类id]            q[‘classification_id__in‘] = id_list         else:            # 方向不为0，分类也不为0            obj = models.Direction.objects.get(id=int(kwargs.get(‘direction_id‘)))            class_list = obj.classification.all().values(‘id‘, ‘name‘)            id_list = list(map(lambda x:x[‘id‘], class_list))            # 过滤条件为视频分类id in [已经选择的视频分类id]            q[‘classification_id__in‘] = [class_id,]             print(‘分类不为0‘)            # 当前分类如果在获取的所有分类中，则方向下的所有相关分类显示            # 当前分类如果不在获取的所有分类中，            if int(kwargs.get(‘classification_id‘)) in id_list:                pass            else:                print(‘不再,获取指定方向下的所有分类：选中的回到全部‘)                url_part_list = request_path.split(‘-‘)                url_part_list[2] = ‘0‘                request_path = ‘-‘.join(url_part_list)    # 视频等级id    level_id = int(kwargs.get(‘level_id‘))    if level_id == 0:        pass    else:        # 过滤条件增加视频等级        q[‘level‘] = level_id     # 取出相对应的视频    video_list = models.Video.objects.filter(**q).values(‘title‘,‘summary‘, ‘img‘, ‘href‘)    # 把视频等级转化为单个标签是字典格式，整体是列表格式    ret = map(lambda x:{"id": x[0], ‘name‘: x[1]}, models.Video.level_choice)    level_list = list(ret)    return render(request, ‘video.html‘, {‘direction_list‘: direction_list,                                          ‘class_list‘: class_list,                                          ‘level_list‘: level_list,                                          ‘current_url‘: request_path,                                          "video_list": video_list})