django 组合搜索

urls:

urlpatterns = [
    path('admin/', admin.site.urls),
    path('index/', views.index),
    re_path(r'^video-(?P<direction_id>(d+))-(?P<classes_id>(d+))-(?P<level_id>(d+)).html$',views.video,name='video2'),#使用关键字正则表达式匹配
]

models:

class Direction(models.Model):
    name = models.CharField(max_length=20)

    class Meta:
        db_table = 'direction'
        verbose_name_plural = '方向'

    def __str__(self):
        return self.name


class Classes(models.Model):
    name = models.CharField(max_length=20)
    classes = models.ManyToManyField('Direction',related_name='classes')

    class Meta:
        db_table = 'classes'
        verbose_name_plural = '课程'

    def __str__(self):
        return self.name


class Level(models.Model):
    title = models.CharField(max_length=20)
    level = models.ManyToManyField('Classes',related_name='level')

    class Meta:
        db_table = 'level'
        verbose_name_plural = '级别'

    def __str__(self):
        return self.title


class Video(models.Model):
    status = (
        (0,'下线'),
        (1,'上线')
    )
    video_status = models.IntegerField(choices=status,verbose_name='状态')
    classes = models.ForeignKey('Classes',on_delete=models.CASCADE,related_name='course',verbose_name='课程')
    level = models.ForeignKey('Level',on_delete=models.CASCADE,related_name='grade',verbose_name='难度级别')
    wright = models.IntegerField(unique=True,verbose_name='权重')
    title = models.CharField(max_length=20,verbose_name='标题')
    intro = models.CharField(max_length=32,verbose_name='简介')
    href = models.CharField(max_length=50,verbose_name='视频地址')

    class Meta:
        db_table = 'video'
        verbose_name_plural = '视频教程'

    def __str__(self):
        return self.title

views:

def video(request,*args,**kwargs):#添加关键字匹配
    container = {}　　　　#创建一个空字典用于给视频字段搜索
    for k,v in kwargs.items():  #把kwargs传过来的关键字参数的值转换为int类型
        temp = int(v)
        kwargs[k] = temp

    direction_id = kwargs.get('direction_id')  #拿到关键字参数
    classes_id = kwargs.get('classes_id')
    level_id = kwargs.get('level_id')

    direction_list = models.Direction.objects.all()   #方向字段

    if direction_id == 0:  　　　　#如果方向为0，列出全部课程
        class_list = models.Classes.objects.all()
        if classes_id == 0:　　　　#如果课程为0，不做任何操作，如果课程不为0把课程ID添加到container字典中
            pass
        else:
            container['classes_id'] = classes_id
        if level_id == 0:　　　　　#如果难度级别为0，不做任何操作，如果不为0把难度级别ID添加到container字典中
            pass
        else:
            container['level_id'] = level_id
    else:
        direction_obj = models.Direction.objects.filter(id=direction_id).first()  #如果方向不为0，根据关键字传过来的ID参数筛选方向对象
        class_list = direction_obj.classes.all()　　　　　　#列出方向对象对应的所有课程
        v_list = direction_obj.classes.all().values_list('id')  #生成方向对象对应的所有课程的ID列表
        if not v_list:　　　　　　　　#如果没有匹配到课程ID列表把列表设置为空
            classes_id_list = []
        else:
            classes_id_list = list(zip(*v_list))[0]   #如果匹配到了通过ZIP函数生成课程ID列表

        if classes_id not in classes_id_list:
           kwargs['classes_id'] = 0
           classes_id = 0
        else:
           container['classes_id'] = classes_id

        if classes_id == 0:　　　　　　　　#如果课程ID为0 用双下划线In方法匹配这个方向下所有的课程ID
            container['classes_id__in'] = classes_id_list
        else:　　　　　　　　　　　　　　　　　　#如果不为0 课程ID赋值给容器字典
            container['classes_id'] = classes_id

        if level_id == 0:
            pass
        else:
            container['level_id'] = level_id

    level_list = models.Level.objects.all()

    video_list = models.Video.objects.filter(**container)  #通过关键字解包匹配视频字段

    return render(request,'video.html',locals())

HTML：

<div>
    <h1>筛选</h1>
    <div>
        {% if kwargs.direction_id == 0 %}
            <a class="actives" href="/video-0-{{ kwargs.classes_id }}-{{ kwargs.level_id }}.html">全部</a>
        {% else %}
            <a href="/video-0-{{ kwargs.classes_id }}-{{ kwargs.level_id }}.html">全部</a>
        {% endif %}
        {% for item in direction_list %}
            {% if item.id == kwargs.direction_id %}
                <a class="actives" href="/video-{{ item.id }}-{{ kwargs.classes_id }}-{{ kwargs.level_id }}.html">{{ item.name }}</a>
            {% else %}
                <a href="/video-{{ item.id }}-{{ kwargs.classes_id }}-{{ kwargs.level_id }}.html">{{ item.name }}</a>
            {% endif %}
        {% endfor %}
    </div>
    <div>
        {% if kwargs.classes_id == 0 %}
            <a class="actives" href="/video-{{ kwargs.direction_id }}-0-{{ kwargs.level_id }}.html">全部</a>
        {% else %}
            <a href="/video-{{ kwargs.direction_id }}-0-{{ kwargs.level_id }}.html">全部</a>
        {% endif %}
        {% for item in class_list %}
            {% if item.id == kwargs.classes_id %}
                <a class="actives" href="/video-{{ kwargs.direction_id }}-{{ item.id }}-{{ kwargs.level_id }}.html">{{ item.name }}</a>
            {% else %}
                <a href="/video-{{ kwargs.direction_id }}-{{ item.id }}-{{ kwargs.level_id }}.html">{{ item.name }}</a>
            {% endif %}
        {% endfor %}
    </div>
    <div>
        {% if kwargs.level_id == 0 %}
            <a class="actives" href="/video-{{ kwargs.direction_id }}-{{ kwargs.classes_id }}-0.html">全部</a>
        {% else %}
            <a href="/video-{{ kwargs.direction_id }}-{{ kwargs.classes_id }}-0.html">全部</a>
        {% endif %}
        {% for item in level_list %}
            {% if item.id == kwargs.level_id %}
                <a class="actives" href="/video-{{ kwargs.direction_id }}-{{ kwargs.classes_id }}-{{ item.id }}.html">{{ item.title}}</a>
            {% else %}
                <a href="/video-{{ kwargs.direction_id }}-{{ kwargs.classes_id }}-{{ item.id }}.html">{{ item.title}}</a>
            {% endif %}
        {% endfor %}
    </div>
</div>


<div>
    <h1>结果</h1>
    <div>
        {% for item in video_list %}
            <p>{{ item.title }}</p>
        {% endfor %}
    </div>
</div>