django5-书籍与出版社关联外键

旧城等待， 2023-06-04 07:53 18阅读 0赞

1.外键相关

**一对多**的概念 ,这里是一个出版社对应本书籍 ! 设计表使用model

models.ForeignKey('关联一', on\_delete=models.CASCADE)　　　　　　　　　　\#给多设置外键 ,关联一 ,设置级联删除当一的内容被删除 ,所关联的多都被删除

from django.db import models
    
    
    # Create your models here.
    class presslist(models.Model):
        name = models.CharField(max_length=32)
    
        def __str__(self):
            return self.name
    
    
    class Book(models.Model):
        name = models.CharField(max_length=32)
        p_id = models.ForeignKey('presslist', on_delete=models.CASCADE)

2.urls.py代码

两套增删改查

from django.conf.urls import url
    from app1 import views
    
    urlpatterns = [
        url(r'^press/list/', views.presslist, name='presslist'),
        url(r'^press/del/(\d+)/', views.pressdel, name='pressdel'),
        url(r'^press/add/', views.pressadd, name='pressadd'),
        url(r'^press/edit/(?P<edit_id>\d+)/', views.pressedit1.as_view(), name='pressedit'),
    
        url(r'^book/list/', views.booklist, name='booklist'),
        url(r'^book/del/(\d+)/', views.bookdel, name='bookdel'),
        url(r'^book/add/', views.bookadd, name='bookadd'),
        url(r'^book/edit/(\d+)/', views.bookedit, name='bookedit'),
    
    ]

3.views视图函数

两套视图函数

重点的 :models.Book.objects.create(name=book\_name, p\_id\_id=press\_id) ,其中创建书籍记录需要关联出版社 ,这里面必须是从出版社表取数据p\_id\_id

from django.shortcuts import render, redirect, reverse, HttpResponse
    from django.views import View
    from app1 import models
    import time
    import functools
    from django.utils.decorators import method_decorator
    
    
    # Create your views here.
    
    
    def presslist(request):
        msg_all = models.presslist.objects.all()
        return render(request, 'cbs.html', {
        'msg': msg_all})
    
    
    def pressadd(request):
        if request.method == 'POST':
            press_name = request.POST.get('name')
            models.presslist.objects.create(name=press_name)
            return redirect(reverse('presslist'))
        return render(request, 'cbsadd-edit.html')
    
    
    def pressdel(request, del_id):
        print(del_id, type(del_id))
        models.presslist.objects.get(pk=del_id).delete()
        return redirect(reverse('presslist'))
    
    
    def pressedit(request, edit_id, test_id):
        obj = models.presslist.objects.get(pk=edit_id)
        print(test_id, edit_id)
        msg = ''
        if request.method == 'POST':
            obj.name = request.POST.get('name')
    
            if models.presslist.objects.filter(name=obj.name):
                msg = '已存在'
    
            if not obj.name:
                msg = '不能为空'
    
            if not models.presslist.objects.filter(name=obj.name) and obj.name:
                obj.save()
    
                return redirect(reverse('presslist'))
        return render(request, 'cbsadd-edit.html', {
        'obj': obj, 'msg': msg})
    
    
    class pressedit1(View):
    
        def get(self, request, edit_id, msg=''):
            obj = models.presslist.objects.get(pk=edit_id)
            return render(request, 'cbsadd-edit.html', {
        'obj': obj, 'msg': msg})
    
        def post(self, request, edit_id):
            msg = ''
            obj = models.presslist.objects.get(pk=edit_id)
            obj.name = request.POST.get('name')
            if models.presslist.objects.filter(name=obj.name):
                msg = '已存在'
            if not obj.name:
                msg = '不能为空'
            if not models.presslist.objects.filter(name=obj.name) and obj.name:
                obj.save()
                return redirect(reverse('presslist'))
            return self.get(request, edit_id, msg)
    
    
    def booklist(request):
        msg_all = models.Book.objects.all()
        return render(request, 'cbs.html', {
        'msg': msg_all})
    
    
    def bookdel(request, del_id):
        models.Book.objects.get(pk=del_id).delete()
        return redirect(reverse('booklist'))
    
    
    def bookadd(request):
        msg_all = models.presslist.objects.all()
        if request.method == 'POST':
            book_name = request.POST.get('name')
            press_id = int(request.POST.get('pid'))
            models.Book.objects.create(name=book_name, p_id_id=press_id)
            return redirect(reverse('booklist'))
        return render(request, 'cbsadd-edit.html', {
        'msg_all': msg_all})
    
    
    def bookedit(request, edit_id):
        obj = models.Book.objects.get(pk=edit_id)
        msg = ''
        if request.method == 'POST':
            obj.name = request.POST.get('name')
    
            if models.Book.objects.filter(name=obj.name):
                msg = '已存在'
    
            if not obj.name:
                msg = '不能为空'
    
            if not models.Book.objects.filter(name=obj.name) and obj.name:
                obj.save()
    
                return redirect(reverse('booklist'))
        return render(request, 'cbsadd-edit.html', {
        'obj': obj, 'msg': msg})

4.模板复用

cbs.html

###展示出版社 ,展示书籍列表的模板
    {% extends 'base.html' %}
    {
         % block body1 %}
        <table class="text-center table table-striped table-bordered">
            <tr>
                <td>ID</td>
                {
         % if msg.0.p_id %}
                    <td>书名</td>
                    <td>出版社名字</td>
                {
         % else %}
                    <td>出版社名字</td>
                {
         % endif %}
                <td>操作</td>
            </tr>
            {
         % for obj in msg %}
                <tr>
                    <td>{
        { obj.pk }}</td>
                    <td>{
        { obj.name }}</td>
                    {
         % if obj.p_id %}
                        <td>{
        { obj.p_id.name }}</td>
                        <td><a href={% url 'bookedit' obj.pk %}><i class="fa fa-pencil-square-o" aria-hidden="true">&nbsp&nbsp&nbsp</i></a>
                            <a href={% url 'bookdel' obj.pk %}><i class="fa fa-remove" aria-hidden="true"></i></a></td>
                    {
         % else %}
                        <td><a href={% url 'pressedit' edit_id=obj.pk %}><i class="fa fa-pencil-square-o"
                                                                            aria-hidden="true">&nbsp&nbsp&nbsp</i></a>
                            <a href={% url 'pressdel' obj.pk %}><i class="fa fa-remove" aria-hidden="true"></i></a></td>
                    {
         % endif %}
    
                </tr>
            {
         % endfor %}
        </table>
    {
         % endblock %}

cbsadd-edit.html

###修改与新增的复用模板
    {% extends 'base.html' %}
    
    {
         % block body1 %}
        <form action="" method="post">
            <div style="margin-left: 100px;margin-top: 50px;" class="col-md-6 ">
                <input type="text" class="form-control" name="name" placeholder="{
         { obj.name }}">{
         { msg }}
                {
         % if msg_all %}
                    <select name="pid">
                        {
         % for obj in msg_all %}
                            <option value="{
         { obj.pk }}">{
        { obj.name }}</option>
                        {
         % endfor %}
                    </select>
                {
         % endif %}
    
            </div>
            <div style="margin-left: 10px;margin-top: 50px;" class="col-md-2 ">
                <button type="submit" class="btn btn-primary">提交</button>
            </div>
        </form>
    {
         % endblock %}

转载于:https://www.cnblogs.com/quguanwen/p/11398973.html