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 == 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 classes_id in classes_id_list:　　#如果课程ID在匹配到的课程列表内            container[‘classes_id‘] = classes_id        else:　　　　　　　　　　　　　　　　　　　　#如果课程ID超出范围            container[‘classes_id__in‘] = classes_id_list

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>

原文地址：https://www.cnblogs.com/louzi/p/9297376.html