class TeacherForm(Form):  #必须继承Form# 创建字段，本质上是正则表达式username = fields.CharField(required=True,     #必填字段error_messages={"required":"用户名不能为空！！"},  #显示中文错误提示widget=widgets.TextInput(attrs={"placeholder":"用户名","class":"form-control"}),  #自动生成input框label="姓名",label_suffix=":")password = fields.CharField(required=True, error_messages={'required': '密码不能为空'},widget=widgets.PasswordInput(attrs={'placeholder': '密码', 'class': 'form-control'}),label="密码",label_suffix=":")  # 不能为空email = fields.EmailField(required=True,error_messages={"required":"邮箱不能为空！！","invalid":"无效的邮箱"},widget=widgets.EmailInput(attrs={"placeholder": "邮箱", "class": "form-control"}),  # 自动生成input框label = "邮箱",label_suffix = ":") #不能为空且邮箱格式要一致

from django.core.exceptions import ValidationError

from django.conf import settings

def editteacher(request,nid):obj = models.UserInfo.objects.filter(id=nid, ut_id=1).first()# print(obj.username)if not obj:return redirect("/teacherindex/")if request.method=="GET":print([obj.id for obj in obj.teacher_classes.all()])  #[2]  拿到select框的id是为了要做默认显示的form = TeacherForm(initial={"username":obj.username,"password":obj.password,"email":obj.email,"teacher_classes":[obj.id for obj in obj.teacher_classes.all()]}) #就让显示一个input框，并且带有原来哪一行的内容return render(request, "editteacher.html", {"form":form})else:form = TeacherForm(data=request.POST)if form.is_valid():#开始校验,注意这要加括号cls_list = form.cleaned_data.pop("teacher_classes")print(cls_list)models.UserInfo.objects.filter(id=nid).update(**form.cleaned_data)obj.teacher_classes.set(cls_list)   #更新第三张表return redirect("/teacherindex/")else:return render(request, "editteacher.html", {"form":form})

def addteacher(request):if request.method=="GET":form = TeacherForm()  #只是让显示一个input框return render(request, "addteacher.html", {"form":form})else:form = TeacherForm(data=request.POST)# print(form)  #<QuerySet [<UserInfo: UserInfo object>, <UserInfo: UserInfo object>, <UserInfo: UserInfo object>]>if form.is_valid():# 开始验证# print('执行成功',form.cleaned_data)          # 所有匹配成功，字典# # {'username': 'ghf', 'password': '435', 'email': 'fddfg@qq.com', 'teacher_classes': ['4']}cls_list = form.cleaned_data.pop("teacher_classes")print("============id",cls_list)form.cleaned_data['ut_id'] = 1#创建新老师的对象teacher_obj = models.UserInfo.objects.create(**form.cleaned_data)#创建新老师和班级的关系teacher_obj.teacher_classes.add(*cls_list)  #以前添加的是对象，现在也可以吧id添加进去return redirect("/teacherindex/")else:# print("=====?",form.errors,type(form.errors))#返回失败的结果# print(form.errors["username"][0])   #拿到返回失败的结果，渲染到页面return render(request, "addteacher.html", {"form":form})