django day2

from django.shortcuts import HttpResponse, render, redirect
from app01 import models
# Create your views here.

# 展示出版社列表
def publisher_list(request):
    # 去数据库查出所有的出版社,填充到HTML中,给用户返回
    ret = models.Publisher.objects.all().order_by("id")
    return render(request, "publisher_list.html", {"publisher_list": ret})

# 添加新的出版社
def add_publisher(request):
    error_msg = ""
    # 如果是POST请求,我就取到用户填写的数据
    if request.method == "POST":
        new_name = request.POST.get("publisher_name", None)
        if new_name:
            # 通过ORM去数据库里新建一条记录
            models.Publisher.objects.create(name=new_name)
            # 引导用户访问出版社列表页,查看是否添加成功  --> 跳转
            return redirect("/publisher_list/")
        else:
            error_msg = "出版社名字不能为空!"
    # 用户第一次来,我给他返回一个用来填写的HTML页面
    return render(request, "add_publisher.html", {"error": error_msg})

# 删除出版社的函数
def delete_publisher(request):
    print(request.GET)  #{'id': ['13']}>
    print(request.GET.get('id')) # 13
    print("=" * 120)
    # 删除指定的数据
    # 1. 从GET请求的参数里面拿到将要删除的数据的ID值
    del_id = request.GET.get("id1", None)  # 字典取值,娶不到默认为None
    # 如果能取到id值
    if del_id:
        # 去数据库删除当前id值的数据
        # 根据id值查找到数据
        del_obj = models.Publisher.objects.get(id=del_id)
        # 删除
        del_obj.delete()
        # 返回删除后的页面,跳转到出版社的列表页,查看删除是否成功
        return redirect("/publisher_list/")
    else:
        return HttpResponse("要删除的数据不存在!")

# 编辑出版社
def edit_publisher(request):
    # 用户修改完出版社的名字,点击提交按钮,给我发来新的出版社名字
    if request.method == "POST":
        # print(request.POST)
        # 取新出版社名字
        edit_id = request.GET.get("nid")
        new_name = request.POST.get("publisher_name")
        # 更新出版社
        # 根据id取到编辑的是哪个出版社
        edit_publisher = models.Publisher.objects.get(id=edit_id)
        edit_publisher.name = new_name
        edit_publisher.save()  # 把修改提交到数据库
        # 跳转出版社列表页,查看是否修改成功
        return redirect("/publisher_list/")
    # 从GET请求的URL中取到id参数
    edit_id = request.GET.get("id")
    if edit_id:
        # 获取到当前编辑的出版社对象
        publisher_obj = models.Publisher.objects.get(id=edit_id)
        return render(request, "edit_publisher.html", {"publisher": publisher_obj})
    else:
        return HttpResponse("编辑的出版社不存在!")

def test(request):
    print(request.GET)
    print(request.GET.get("id"))
    return HttpResponse("OK")

from django.db import models

# Create your models here.

# 出版社
class Publisher(models.Model):
    id = models.AutoField(primary_key=True)  # 自增的ID主键
    # 创建一个varchar(64)的唯一的不为空的字段
    name = models.CharField(max_length=64, null=False, unique=True)

publisher_list:

<tbody>
    {% for publisher in publisher_list %}
        <tr>
        <td>{{ forloop.counter }}</td>
        <td>{{ publisher.id }}</td>
        <td>{{ publisher.name }}</td>
        <td>
            <a class="btn btn-danger" href="/delete_publisher/?id={{ publisher.id }}">删除</a>
            <a class="btn btn-info" href="/edit_publisher/?id={{ publisher.id }}">编辑</a>
        </td>
        </tr>
    {% endfor %}
    </tbody>
</table>

<h1>编辑出版社</h1>

<form action="/edit_publisher/?nid={{ publisher.id }}" method="post">
    <input type="text" name="publisher_name" value="{{ publisher.name }}">
    <input type="submit" value="提交">
    <p style="color: red">{{ error }}</p>
</form>

<h1>添加出版社</h1>

<form action="/add_publisher/" method="post">
    {% csrf_token %}
    <input type="text" name="publisher_name">
    <input type="submit" value="提交">
    <p style="color: red">{{ error }}</p>
</form>