一、定义的规则
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
页面上渲染
用第二种方式需要加上下面的这个：
二、下拉框的规则
三、判断用户民是不存在，存在就不添加了
需要导入：
from django.core.exceptions import ValidationError
、
四、initial 修改时用到
五、自定义配置
1、在settings中：
2、导入settings
from django.conf import settings
3、使用
六、多对多修改两种方式（用Form）
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})
七、多对多添加（用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})
