Django组合查询

针对于一对多；多对多进行组合查询 各种分类组合查询 创建表： models.py

from django.db import models class Direction(models.Model): """ 方向：自动化，测试，运维，前端 """ name = models.CharField(verbose_name='名称', max_length=32) classification = models.ManyToManyField('Classification') class Meta: db_table = 'Direction' verbose_name_plural = '方向（视频方向）' def __str__(self): return self.name class Classification(models.Model): """ 分类：Python Linux JavaScript OpenStack Node.js """ name = models.CharField(verbose_name='名称', max_length=32) class Meta: db_table = 'Classification' verbose_name_plural = '分类（视频分类）' def __str__(self): return self.name class Level(models.Model): title = models.CharField(max_length=32) class Meta: verbose_name_plural = '难度级别' def __str__(self): return self.title class Video(models.Model): status_choice = ( (1, '下线'), (2, '上线'), ) status = models.IntegerField(verbose_name='状态', choices=status_choice, default=1) level = models.ForeignKey(Level) 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/') img = models.CharField(verbose_name='图片',max_length=32) 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 = '视频' def __str__(self): return self.title

views.py

from django.shortcuts import render,HttpResponse from django.http import JsonResponse from app01 import models import json def video(request,*args,**kwargs): condition = { # 'level_id': 0, # 'classification_id': 0, } for k,v in kwargs.items(): temp = int(v) kwargs[k] = temp if temp: condition[k] = temp class_list = models.Classification.objects.all() level_list = models.Level.objects.all() """ status_choice = ( (1, '下线'), (2, '上线'), ) """ status_list = list(map(lambda x:{'id':x[0],'name':x[1]},models.Video.status_choice)) video_list = models.Video.objects.filter(**condition) return render( request, 'video.html', { 'class_list':class_list, 'level_list':level_list, 'status_list':status_list, 'kwargs':kwargs, 'video_list':video_list, } ) def video2(request,*args,**kwargs): condition = {} for k, v in kwargs.items(): temp = int(v) kwargs[k] = temp print(kwargs) #　(?P<direction_id>(\d+))-(?P<classification_id>(\d+))-(?P<level_id>(\d+)) # 构造查询字典 direction_id = kwargs.get('direction_id') classification_id = kwargs.get('classification_id') level_id = kwargs.get('level_id') direction_list = models.Direction.objects.all() if direction_id == 0: class_list = models.Classification.objects.all() if classification_id == 0: pass else: condition['classification_id'] = classification_id else: direction_obj = models.Direction.objects.filter(id=direction_id).first() class_list = direction_obj.classification.all() vlist = direction_obj.classification.all().values_list('id') if not vlist: classification_id_list = [] else: classification_id_list = list(zip(*vlist))[0] if classification_id == 0: condition['classification_id__in'] = classification_id_list else: if classification_id in classification_id_list: condition['classification_id'] = classification_id else: #################指定方向：[1,2,3] 分类：5 kwargs['classification_id'] = 0 condition['classification_id__in'] = classification_id_list if level_id == 0: pass else: condition['level_id'] = level_id level_list = models.Level.objects.all() video_list = models.Video.objects.filter(**condition) return render( request, 'video2.html', { 'direction_list':direction_list, 'class_list':class_list, 'level_list':level_list, 'video_list':video_list, 'kwargs':kwargs, } ) """ 如果：direction_id 0 *列出所有的分类 如果 classification_id = 0： pass else: condition['classification_id'] = classification_id 否则：direction_id != 0 *列表当前方向下的所有分类 如果 classification_id = 0： 获取当前方向下的所有分类 [1,2,3,4] condition['classification_id__in'] = [1,2,3,4] else: classification_id != 0 获取当前方向下的所有分类 [1,2,3,4] classification_id 是否在 [1,2,3,4] : condition['classification_id'] = classification_id else: condition['classification_id__in'] = [1,2,3,4] """ # models.Video.objects.filter() # return render(request,'video2.html')\

urls.py

from django.conf.urls import url from django.contrib import admin from app01 import views urlpatterns = [ url(r'^admin/', admin.site.urls), url(r'^video-(?P<classification_id>(\d+))-(?P<level_id>(\d+))-(?P<status>(\d+)).html$', views.video), url(r'^video2-(?P<direction_id>(\d+))-(?P<classification_id>(\d+))-(?P<level_id>(\d+)).html$', views.video2,name='video2'), ]

前端显示

video.html

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> .condition a{ display: inline-block; padding: 5px 8px; border: 1px solid #dddddd; } .condition a.active{ background-color: coral; color: white; } </style> </head> <body> <div class="condition"> <h1>筛选</h1> <div> {% if kwargs.classification_id == 0 %} <a class="active" href="/video-0-{{ kwargs.level_id }}-{{ kwargs.status }}.html">全部</a> {% else %} <a href="/video-0-{{ kwargs.level_id }}-{{ kwargs.status }}.html">全部</a> {% endif %} {% for item in class_list %} {% if item.id == kwargs.classification_id %} <a href="/video-{{ item.id }}-{{ kwargs.level_id }}-{{ kwargs.status }}.html" class="active">{{ item.name }}</a> {% else %} <a href="/video-{{ item.id }}-{{ kwargs.level_id }}-{{ kwargs.status }}.html">{{ item.name }}</a> {% endif %} {% endfor %} </div> <div> <a href="/video-{{ kwargs.classification_id }}-0-{{ kwargs.status }}.html">全部</a> {% for item in level_list %} {% if item.id == kwargs.level_id %} <a href="/video-{{ kwargs.classification_id }}-{{ item.id }}-{{ kwargs.status }}.html" class="active">{{ item.title }}</a> {% else %} <a href="/video-{{ kwargs.classification_id }}-{{ item.id }}-{{ kwargs.status }}.html">{{ item.title }}</a> {% endif %} {% endfor %} </div> <div> <a href="/video-{{ kwargs.classification_id }}-{{ kwargs.level_id }}-0.html">全部</a> {% for item in status_list %} {% if item.id == kwargs.status %} <a class="active" href="/video-{{ kwargs.classification_id }}-{{ kwargs.level_id }}-{{ item.id }}.html">{{ item.name }}</a> {% else %} <a href="/video-{{ kwargs.classification_id }}-{{ kwargs.level_id }}-{{ item.id }}.html">{{ item.name }}</a> {% endif %} {% endfor %} </div> </div> <div> <h1>结果</h1> <div> {% for row in video_list %} <div>{{ row.title }}</div> {% endfor %} </div> </div> </body> </html>

video2.html

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> .condition a{ display: inline-block; padding: 5px 8px; border: 1px solid #dddddd; } .condition a.active{ background-color: coral; color: white; } </style> </head> <body> <div class="condition"> <h1>筛选</h1> <div> {% if kwargs.direction_id == 0 %} <a href="{% url "video2" direction_id=0 classification_id=kwargs.classification_id level_id=kwargs.level_id %}" class="active">全部</a> {% else %} <a href="{% url "video2" direction_id=0 classification_id=kwargs.classification_id level_id=kwargs.level_id %}">全部</a> {% endif %} {% for item in direction_list %} {% if item.id == kwargs.direction_id %} <a href="{% url "video2" direction_id=item.id classification_id=kwargs.classification_id level_id=kwargs.level_id %}" class="active">{{ item.name }}</a> {% else %} <a href="{% url "video2" direction_id=item.id classification_id=kwargs.classification_id level_id=kwargs.level_id %}">{{ item.name }}</a> {% endif %} {% endfor %} </div> <div> {% if kwargs.classification_id == 0 %} <a href="/video2-{{ kwargs.direction_id }}-0-{{ kwargs.level_id }}.html" class="active">全部</a> {% else %} <a href="/video2-{{ kwargs.direction_id }}-0-{{ kwargs.level_id }}.html">全部</a> {% endif %} {% for item in class_list %} {% if item.id == kwargs.classification_id %} <a href="/video2-{{ kwargs.direction_id }}-{{ item.id }}-{{ kwargs.level_id }}.html" class="active">{{ item.name }}</a> {% else %} <a href="/video2-{{ kwargs.direction_id }}-{{ item.id }}-{{ kwargs.level_id }}.html" >{{ item.name }}</a> {% endif %} {% endfor %} </div> <div> {% if kwargs.level_id == 0 %} <a href="/video2-{{ kwargs.direction_id }}-{{ kwargs.classification_id }}-0.html" class="active">全部</a> {% else %} <a href="/video2-{{ kwargs.direction_id }}-{{ kwargs.classification_id }}-0.html">全部</a> {% endif %} {% for item in level_list %} {% if item.id == kwargs.level_id %} <a href="/video2-{{ kwargs.direction_id }}-{{ kwargs.classification_id }}-{{ item.id }}.html" class="active">{{ item.title }}</a> {% else %} <a href="/video2-{{ kwargs.direction_id }}-{{ kwargs.classification_id }}-{{ item.id }}.html" >{{ item.title }}</a> {% endif %} {% endfor %} </div> </div> <div> <h1>结果</h1> {% for row in video_list %} <div>{{ row.title }}</div> {% endfor %} </div> </body> </html>