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>