django 多对多 增 删 改 查

Posted 2020-10-06 zjltt

 

 

一、通过url方式实现多对多的：增加，删除，编辑

代码目录：

urls.py

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"""django_one URL Configuration   The `urlpatterns` list routes URLs to views. For more information please see:     https://docs.djangoproject.com/en/1.10/topics/http/urls/ Examples: Function views     1. Add an import:  from my_app import views     2. Add a URL to urlpatterns:  url(r\'^$\', views.home, name=\'home\') Class-based views     1. Add an import:  from other_app.views import Home     2. Add a URL to urlpatterns:  url(r\'^$\', Home.as_view(), name=\'home\') Including another URLconf     1. Import the include() function: from django.conf.urls import url, include     2. Add a URL to urlpatterns:  url(r\'^blog/\', include(\'blog.urls\')) """ from django.conf.urls import url from django.contrib import admin from app01.views import classes from app01.views import students from app01.views import teachers   urlpatterns = [     url(r\'^admin/\', admin.site.urls),     url(r\'^get_classes.html$\', classes.get_classes),     url(r\'^add_classes.html$\', classes.add_classes),     url(r\'^del_classes.html$\', classes.del_classes),     url(r\'^edit_classes.html$\', classes.edit_classes),       url(r\'^get_students.html$\', students.get_students),     url(r\'^add_students.html$\', students.add_students),     url(r\'^del_students.html$\', students.del_students),     url(r\'^edit_students.html$\', students.edit_students),       url(r\'^get_teachers.html$\', teachers.get_teachers),     url(r\'^add_teachers.html$\', teachers.add_teachers),     url(r\'^del_teachers.html$\', teachers.del_teachers),     url(r\'^edit_teachers.html$\', teachers.edit_teachers),   ]

models.py

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from django.db import models   # Create your models here.   class Classes(models.Model):     """     班级表,男     """     titile = models.CharField(max_length=32)     m = models.ManyToManyField("Teachers")   class Teachers(models.Model):     """     老师表，女     """     name = models.CharField (max_length=32)   """ cid_id  tid_id  1    1  1    2  6    1  1000  1000 """ # class C2T(models.Model): #     cid = models.ForeignKey(Classes) #     tid = models.ForeignKey(Teachers)   class Student(models.Model):     username = models.CharField(max_length=32)     age = models.IntegerField()     gender = models.BooleanField()     cs = models.ForeignKey(Classes)

teachers.py

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from django.shortcuts import render from django.shortcuts import redirect from app01 import models     def get_teachers(request):     cls_list = models.Classes.objects.all()     return render(request,\'get_teachers.html\',{\'cls_list\':cls_list})   def add_teachers(request):     if request.method == "GET":         teachers_list = models.Teachers.objects.all()         return render(request, \'add_teachers.html\',{\'teachers_list\':teachers_list})     elif request.method == "POST":         nid = request.POST.get(\'titile\')         # [1,2,3,4,]         teachers_id = request.POST.getlist(\'teachers_id\')         # 10         obj = models.Classes.objects.create(titile = nid)         # 10 1         # 10 2         # 10 3         # 10 4         obj.m.add(*teachers_id)         return redirect(\'get_teachers.html\')     def del_teachers(request):     nid = request.GET.get(\'nid\')     models.Classes.objects.filter(id=nid).delete()     return redirect(\'get_teachers.html\')     def edit_teachers(request):     if request.method == "GET":         nid = request.GET.get(\'nid\')         obj = models.Classes.objects.filter(id=nid).first()         teachers_list = models.Teachers.objects.all()         return render(request,\'edit_teachers.html\',{\'nid\':nid,\'obj\':obj,\'teachers_list\':teachers_list})     elif request.method == "POST":         n = request.POST.get(\'nid\')         t = request.POST.get(\'titile\')         teachers_id = request.POST.getlist(\'teachers_id\')         obj = models.Classes.objects.filter(id=n).update(             id=n,             titile=t,         )         obj.m.add(*teachers_id)         return redirect(\'get_teachers.html\')

添加功能

get_teachers.html

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<!DOCTYPE html> <html lang="en"> <head>     <meta charset="UTF-8">     <title>Title</title> </head> <body> <div>     <a href="/add_teachers.html">添加</a> </div> <div>     <table border="1">         <thead>         <tr>             <th>ID</th>             <th>班级</th>             <th>分配老师</th>             <th>操作</th>         </tr>         </thead>         <tbody>         {% for row in cls_list %}             <tr>                 <td>{{ row.id }}</td>                 <td>{{ row.titile }}</td>                 <td>                     {% for cls in row.m.all %}                     {{ cls.name }}                     {% endfor %}                 </td>                 <td>                     <a href="/del_teachers.html?nid={{ row.id }}">删除</a>                     |                     <a href="/edit_teachers.html?nid={{ row.id }}">编辑</a>                 </td>             </tr>         {% endfor %}         </tbody>     </table> </div> </body> </html>

添加功能

add_teachers.html

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<!DOCTYPE html> <html lang="en"> <head>     <meta charset="UTF-8">     <title>Title</title> </head> <body> <form action="add_teachers.html" method="POST">     {% csrf_token %}     <p><input type="text" name="titile" placeholder="班级" /></p>     <p>     <select name="teachers_id" multiple="multiple" >           {% for teachers in teachers_list %}            <option value="{{ teachers.id}}">{{ teachers.name }}</option>           {% endfor %}     </select>     </p>     <input type="submit" value="提交" /> </form> </body> </html>

编辑功能

edit_teachers.html

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<!DOCTYPE html> <html lang="en"> <head>     <meta charset="UTF-8">     <title>Title</title> </head> <body> <form action="/edit_teachers.html?nid={{ nid }}" method="POST">     {% csrf_token %}      <p><input type="text" name="titile" placeholder="班级" value="{{ obj.titile }}"/></p>     <p>     <select name="teachers_id" multiple="multiple" >           {% for teachers in teachers_list %}            <option value="{{ teachers.id}}">{{ teachers.name }}</option>           {% endfor %}     </select>     </p>     <input type="submit" value="提交"> </form> </body> </html>