多表查询多对多关系之老师表单的增删改查

表单的建立

from django.db import models

# Create your models here.
#创建教室表单
class Class_list(models.Model):
    id=models.AutoField(primary_key=True)
    cname=models.CharField(max_length=32)
    first_day=models.DateField()
    def __str__(self):
        return self.cname

#创建老师表单
class Teacher(models.Model):
    tname=models.CharField(max_length=32)

    cid=models.ManyToManyField("Class_list")
    #设置manytomant 外键，他自动生成了第三个关联老师和教室的对应关系表

多表查询多对多关系之老师表单的增删改查

第三张表上放的每一个值实际上可以指带的是一个对象（一条数据）而不单单是一个id# 也可以是id}

查看老师信息

html页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>teacher_list</title>
</head>
<body>
{% csrf_token %}

<div class="c1">
    <button type="button"><span><a href='{% url 'add_teacher' %}' >新增</a></span></button>
</div>
<div class="c2">
    <table border="2">
        <thead>
        <tr>
            <th>序号</th>
            <th>id</th>
            <th>姓名</th>
            <th>班级</th>
            <th>功能</th>
        </tr>
        </thead>
        <tbody>
        {% for teacher in teacher_list %}
            <tr>

                <td> {{ forloop.counter }}</td>
                <td>{{ teacher.id }}</td>
                <td>{{ teacher.tname }}</td>
                  <td>
                    {% for class in teacher.cid.all %}
                        {{ class.cname }}
                    {% endfor %}
                  </td>


                <td>
                    <a href="">aaa</a>
{#                    <button type="button"><span><a href="{% url 'delete_class' class.id %}">删除</a></span></button>#}
                    <button type="button"><span><a href="{% url 'edit_teacher' teacher.id  %} ">编辑</a></span></button>
                </td>

            </tr>
        {% endfor %}
        </tbody>
    </table>
</div>

</body>
</html>

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