西游之路——python全栈——学员管理示例之学员管理（一对多）

一、students.py文件

from django.shortcuts import render,redirect
from app01 import models

def get_students(request):
    stu_list = models.Students.objects.all()
    # print(cls_list)
    return render(request,"get_students.html",{"stu_list":stu_list})

def add_students(request):
    if request.method == "GET":
        cs_list = models.Classes.objects.all()
        return render(request, "add_students.html",{"cs_list":cs_list})
    elif request.method == "POST":
        name = request.POST.get("username")
        age = request.POST.get("age")
        gender = request.POST.get("gender")
        cs = request.POST.get("cs")
        models.Students.objects.create(
            name=name,
            age=age,
            gender=gender,
            cs_id=cs
        )
        return redirect("/students.html")

def del_students(request):
    nid = request.GET.get("nid")
    models.Students.objects.filter(id=nid).delete()
    return redirect("/students.html")

def edit_students(request):
    if request.method == "GET":
        nid = request.GET.get("nid")
        obj = models.Students.objects.filter(id=nid).first()  # 加first()转为对象才可在HTML中直接调用
        cs_list = models.Classes.objects.all()
        return render(request,"edit_students.html",locals())
    elif request.method == "POST":
        u = request.POST.get("username")
        a = request.POST.get("age")
        g = request.POST.get("gender")
        c = request.POST.get("class_id")
        nid = request.POST.get("id")
        models.Students.objects.filter(id=nid).update(
            name=u,
            age=a,
            gender=g,
            cs_id=c
        )
        return redirect("/students.html")

二、HTML文件

增加学员

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h3>添加用户</h3>
<form action="/add_students.html" method="POST">
    {% csrf_token %}
    <p><input type="text" name="username" placeholder="用户名"></p>  
    <p><input type="text" name="age" placeholder="年龄"></p>
    <p>
            男：<input type="radio" name="gender"  value="1">   {#name相等时互相排斥#}
            女：<input type="radio" name="gender" value="0">

    </p>
    <p>
        <select name="cs" id="">   {# 下拉框 cs为value值，用于回传 #}
            {% for row in cs_list %}
                <option value="{{row.id}}">{{row.name}}</option>
            {% endfor %}
        </select>
    </p>
    <input type="submit" value="提交">
</form>
</body>
</html>

　　编辑学员

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<form action="/edit_students.html" method="POST">
    {% csrf_token %}
    <p><input type="text" name="id" value="{{obj.id}}" style="display:none"></p>
    <p><input type="text" name="username" value="{{obj.name}}"></p>
    <p><input type="text" name="age" value="{{obj.age}}"></p>
    <p>
        {% if obj.gender  %}
            男：<input type="radio" name="gender" checked="checked"  value="1">    {# 默认选择 #}
            女：<input type="radio" name="gender" value="0">
        {% else %}
            男：<input type="radio" name="gender" value="1">
            女：<input type="radio" name="gender" checked="checked" value="0">
        {% endif %}
    </p>
    <p>
        <select name="class_id" id="">
            {% for row in cs_list %}
                {% if row.id == obj.cs_id %}   {# 判断关联ID相同，默认选中 #}
                    <option value="{{row.id}}" selected="selected">{{row.name}}</option>
                {% else %}
                    <option value="{{row.id}}" >{{row.name}}</option>
                {% endif %}
            {% endfor %}
        </select>
    </p>
    <input type="submit" value="提交">
</form>

</body>
</html>