python【第二十篇】Django表的多对多、Ajax

 1 class Host(models.Model):
 2     nid = models.AutoField(primary_key=True)
 3     hostname = models.CharField(max_length=32,db_index=True)
 4     ip = models.GenericIPAddressField(protocol="ipv4",db_index=True)
 5     port = models.IntegerField()
 6     b = models.ForeignKey(to="Business", to_field='id')
 7 
 8 class Application(models.Model):
 9     name = models.CharField(max_length=32)
10 
11 
12 class HostToApp(models.Model):
13     hobj = models.ForeignKey(to='Host',to_field='nid')
14     aobj = models.ForeignKey(to='Application',to_field='id')

models.HostToApp.objects.create(hobj_id=1,aobj_id=2)

 1 class Host(models.Model):
 2     nid = models.AutoField(primary_key=True)
 3     hostname = models.CharField(max_length=32,db_index=True)
 4     ip = models.GenericIPAddressField(protocol="ipv4",db_index=True)
 5     port = models.IntegerField()
 6     b = models.ForeignKey(to="Business", to_field='id')
 7 
 8 class Application(models.Model):
 9     name = models.CharField(max_length=32)
10     r = models.ManyToManyField("Host")

obj = models.Application.objects.get(id=1)
obj.name

# 第三张表操作
# 添加
obj.r.add(1)
obj.r.add(2)
obj.r.add(2,3,4)
obj.r.add(*[1,2,3,4])

# 删除
obj.r.remove(1)
obj.r.remove(2,4)
obj.r.remove(*[1,2,3])

# 清除obj所对应的所有主机
obj.r.clear()

# 设置，可以理解为删除原来的，设置成下面的
obj.r.set([3,5,7])

# 所有相关的主机对象“列表” QuerySet
obj.r.all()

 1 $('#app-edit5').click(function () {
 2     $.ajax({
 3         url: "/cmdb/app_edit_ajax/",  //提交给哪个url
 4         type: "POST",                 //请求方式
 5         data: $('#app-edit-form').serialize(),    //请求数据可以以字典的形式，此处是获取这个form表单中的所有
 6         traditional: true,             // 提交数据中有数组
 7         dataType: "JSON",              // 写了这个不用反序列化data，data就直接是对象
 8         success:function (data) {
 9             if(data.status){
10                 location.reload();     //刷新页面
11             }else {
12                 $('#app_edit_error').text(data.error);
13             }
14         }
15     })
16 });

 1 def app_edit_ajax(request):
 2     if request.method == "POST":
 3         ret = {'status': True, 'error': None, 'data': None}
 4         aid = request.POST.get("nid")
 5         app_name = request.POST.get("app-name")
 6         h_list = request.POST.getlist("app-hosts")
 7         try:
 8             if app_name:
 9                 obj = models.Application.objects.filter(id=aid).first()
10                 obj.name = app_name
11                 obj.save()
12                 obj.r.set(h_list)
13             else:
14                 ret['status'] = False
15                 ret['error'] = "应用名称不能为空"
16         except Exception as e:
17             print("错误信息：", e)
18             ret['status'] = False
19             ret['error'] = '请求错误'
20 
21         return HttpResponse(json.dumps(ret))

1 请求 -> 路由系统 -> 试图函数(获取模板+数据=》渲染) -> 字符串返回给用户

1 /index/                ->  函数或类.as_view()
2 /detail/(\d+)          ->  函数(参数) 或 类.as_view()（参数）
3 /detail/(?P<nid>\d+)   ->  函数(参数) 或 类.as_view()（参数）
4 
5 /detail/               ->  include("app01.urls")
6 /detail/    name='a1'  ->  include("app01.urls")
7                        - 视图中：reverse
8                        - 模板中：{% url "a1" %}

from django.views import View
class Home(View):
    def dispatch(self, request, *args, **kwargs):
        print("before")
        result = super(Home, self).dispatch(request, *args, **kwargs)
        print("after")
        return result

    def get(self, request):
        print(request.method)
        return render(request, "home.html")

    def post(self, request):
        print(request.method, "post")
        return render(request, "home.html")

def host(request):
    if request.method == "GET":
        h_dic = models.Host.objects.all()
        h_dic1 = models.Host.objects.filter(nid__gt=0).values('nid', 'hostname', 'b_id', 'b__caption')
        h_dic2 = models.Host.objects.filter(nid__gt=0).values_list('nid', 'hostname', 'b_id', 'b__caption')

        b_list = models.Business.objects.all()

        return render(request, "host.html", {'h_dic': h_dic, 'h_dic1': h_dic1, 'h_dic2': h_dic2, 'b_list': b_list})

    elif request.method == "POST":
        h = request.POST.get("hostname", None)
        i = request.POST.get("ip", None)
        p = request.POST.get("port", None)
        b = request.POST.get("b_id", None)

        models.Host.objects.create(hostname=h,
                                   ip=i,
                                   port=p,
                                   b_id=b)

        return redirect('/host/')

 1 request.POST.get
 2 request.GET.get
 3 reqeust.FILES.get()   #获取文件
 4 
 5 # checkbox,
 6 ........getlist()   #获取列表
 7 
 8 request.path_info  # 获取路径
 9 
10 
11 文件对象 = reqeust.FILES.get()
12 文件对象.name
13 文件对象.size
14 文件对象.chunks()
15 #依赖这个设置 <form enctype="multipart/form-data"></form>

render(request, "模板的文件的路径", {'k1': [1,2,3,4],"k2": {'name': 'zingp','age': 73}})
redirect("URL")
HttpResponse(字符串)

# 视图函数中：
render(request, "模板的文件的路径", {'obj': 1234, 'k1': [1,2,3,4],"k2": {'name': 'zingp','age': 73}})

#html
<html>

<body>
    <h1> {{ obj }} </h1>
    <h1> {{ k1.3 }} </h1>
    <h1> {{ k2.name }} </h1>
    {% for i in k1 %}
        <p> {{ i }} </p>
    {% endfor %}
    
    {% for row in k2.keys %}
        {{ row }}
    {% endfor %}
    
    {% for row in k2.values %}
        {{ row }}
    {% endfor %}
    
    {% for k,v in k2.items %}
        {{ k }} - {{v}}
    {% endfor %}
    
</body>
</html>