django 多对多增删改查

一、通过url方式实现多对多的：增加，删除，编辑

代码目录：

urls.py

"""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

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

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

<!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

<!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

<!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>