Python Django form 组件动态从数据库取choices数据实例

 from django.db import models class UserInfo(models.Model): username = models.CharField(max_length=16) password = models.CharField(max_length=16) mobile = models.CharField(max_length=11) class City(models.Model): name = models.CharField(max_length=16, null=False, unique=True)

 from django.shortcuts import render, HttpResponse from app01 import models from django import forms from django.forms import widgets from django.core.validators import RegexValidator from django.core.exceptions import ValidationError class RegForm(forms.Form): username = forms.CharField( min_length=5, label="用户名", error_messages={ "min_length": "用户名不能小于5位！", "required": "该字段不能为空" }, widget=widgets.TextInput(attrs={"class": "form-control"}) ) password = forms.CharField( min_length=6, label="密码", error_messages={ "min_length": "密码不能少于6位！", "required": "该字段不能为空" }, widget=widgets.PasswordInput(attrs={"class": "form-control"}, render_value=True) ) re_password = forms.CharField( min_length=6, label="确认密码", error_messages={ "required": "该字段不能为空" }, widget=widgets.PasswordInput(attrs={"class": "form-control"}, render_value=True) ) mobile = forms.CharField( label="手机号", # 自定义正则匹配规则 validators=[ RegexValidator(r'^[0-9]+$', "手机号必须是数字"), # 判断手机号是否为数字 RegexValidator(r'^1[3-9][0-9]{9}$', "手机格式有误") # 判断手机号是否为 1 和 3-9 开头的十一位数 ], error_messages={ "required": "该字段不能为空", }, widget=widgets.TextInput(attrs={"class": "form-control"}) ) city = forms.ChoiceField( choices=models.City.objects.values_list("id", "name"), label="城市", initial=2, widget=widgets.Select() ) # 重写父类的 __init__ 方法 def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) self.fields['city'].widget.choices = models.City.objects.values_list("id", "name") # 判断用户名信息 def clean_username(self): value = self.cleaned_data.get("username") if "admin" in value: raise ValidationError("用户名不能含有敏感信息") # 重写父类的 clean 方法 def clean(self): password = self.cleaned_data.get("password") re_password = self.cleaned_data.get("re_password") if re_password != password: self.add_error("password", ValidationError("两次密码不一致")) self.add_error("re_password", ValidationError("两次密码不一致")) raise ValidationError("两次密码不一致") return self.cleaned_data def reg2(request): form_obj = RegForm() # GET 请求 if request.method == "POST": form_obj = RegForm(request.POST) # 让 form 来帮我们进行校验 if form_obj.is_valid(): # 如果通过校验 # 所有经过校验的数据都保存在 form_obj.cleaned_data p<span style="color:transparent">来源gaodai#ma#com搞*代#码网</span>rint(form_obj.cleaned_data) models.UserInfo.objects.create(**form_obj.cleaned_data) return HttpResponse("注册成功") return render(request, "reg2.html", {"form_obj": form_obj})