ModelForm的简单使用-注册用modelform编写

1.前端的ajax代码不用改动

2.modelform，在原来基础上稍作改动

from django import forms
from app01.models import UserInfo
from django.forms import widgets as wid
from django.core.exceptions import ValidationError
import re

class UserModelForm(forms.ModelForm):
    r_password = forms.CharField(min_length=5, label="确认密码", widget=wid.PasswordInput(),
                                 error_messages={
                                     "required": "确认密码不能为空！",
                                     "min_length": "确认密码不能少于5位！"
                                 }
                                 )
    class Meta:
        model=UserInfo
        fields=["username","password","r_password","email"]
        labels={
            "username":"用户名",
            "password":"密码",
            "email":"邮箱"
        }
        error_messages={
            "username":{"required":"用户名不能为空！",
                        "min_length":"用户名不能少于5位！"},
            "password":{"required":"密码不能为空！",
                        "min_length": "密码不能少于5位！"},
            "email":{"required":"邮箱不能为空！",
                     "invalid":"邮箱格式错误！"}
        }
        widgets={"password":wid.PasswordInput()}

    def __init__(self,*args,**kwargs):
        super().__init__(*args,**kwargs)
        for field in self.fields.values():
            field.widget.attrs.update({"class":"form-control"})

    def clean_username(self):
        val = self.cleaned_data.get("username")
        user_obj = UserInfo.objects.filter(username=val).first()
        if user_obj:
            raise ValidationError("该用户已经存在！")
        else:
            return val

    def clean_password(self):
        val = self.cleaned_data.get("password")
        if val.isdigit():
            raise ValidationError("密码不能是纯数字！")
        else:
            return val

    def clean_email(self):
        val = self.cleaned_data.get("email")
        ret = re.search("w+@163.com$",val)
        if ret:
            return val
        else:
            raise ValidationError("邮箱必须是163邮箱！")

    def clean(self):
        password = self.cleaned_data.get("password")
        r_password = self.cleaned_data.get("r_password")
        if password and r_password and password != r_password:
            self.add_error("r_password",ValidationError("两次密码输入不一致！"))
        else:
            return self.cleaned_data

3.视图函数，稍微一改

def reg(request):
    # 注册功能
    if request.method == "POST":
        ret = json.loads(request.body)
        form = UserModelForm(ret)
        res = {"status":200,"err_msg":""}
        if form.is_valid():
            form.save()
            # del ret["r_password"]
            # UserInfo.objects.create_user(**ret)
        else:
            res["status"] = 201
            res["err_msg"] = form.errors
        return JsonResponse(res)
    else:
        form = UserModelForm()
        return render(request,"reg.html",{"form":form})

modelform的使用

(1)  model的知识点：
             class UserInfo(AbstractUser):
                    tel=models.CharField(max_length=32)
                    gender=models.IntegerField(choices=((1,"男"),(2,"女")),default=1)
             
             yuan=UserInfo.objects.get(pk=1)
             yuan.get_gender_display()

    (2) modelform使用
        model.py:
            class Book(models.Model):
                nid=models.AutoField(primary_key=True)
                title=models.CharField(max_length=32)
                price=models.DecimalField(max_digits=8,decimal_places=2) # 999999.99
                pub_date=models.DateTimeField()  # "2012-12-12"

                # comment_count=models.IntegerField(default=100)
                # poll_count=models.IntegerField(default=100)

                publish=models.ForeignKey(to="Publish",on_delete=models.CASCADE)  # 级联删除
                authors=models.ManyToManyField(to="Author")
                def __str__(self):
                    return self.title
        form.py:
               # 构建modelform
               class BookModelForm(forms.ModelForm):
                    class Meta:
                        model=Book
                        fields="__all__"
                        
               '''
               BookModelForm等同于：
                    class BookForm(forms.Form):
                            title=forms.CharField(max_length=32)
                            price=forms.IntegerField()
                            pub_date=forms.DateField(widget=widgets.TextInput(attrs={"type":"date"}))
                            #publish=forms.ChoiceField(choices=[(1,"AAA"),(2,"BBB")])
                            publish=forms.ModelChoiceField(queryset=Publish.objects.all())
                            authors=forms.ModelMultipleChoiceField(queryset=Author.objects.all())
      
               '''
                

        逻辑：
            添加书籍：
                def add(reqeust):
                     if GET请求：
                          form=BookModelForm()
                          return render(reqeust,{"form":form})
                          '''
                          渲染页面
                              <form action="" method="post" novalidate>
                                    {% csrf_token %}
                                      {% for field in form %}
                                            <div class="form-group">
                                                 <label for="title">{{ field.label }}</label>
                                                 {{ field }}
                                                 <span>{{ field.errors.0 }}</span>
                                            </div>
                                     {% endfor %}
                                    <input type="submit" value="提交" class="btn btn-default pull-right">
                              </form>
                          '''
                    else POST请求：
                          form=BookModelForm(request.POST)
                          if form.is_valid():
                              form.save() # Book.objects.create(clean_data)
                              return redirect("/")
                          else:
                             return render(reqeust,{"form":form})
                               
                                
                
            编辑书籍： 
                           
                def edit(request,id):
                        edit_obj=Book.objects.get(pk=id)
                        if GET请求：
                          form=BookModelForm(instance=edit_obj)
                          return render(reqeust,{"form":form})
                          '''
                          渲染页面同添加页面
                              
                          '''
                    else POST请求：
                          form=BookModelForm(request.POST,instance=edit_obj)
                          if form.is_valid():
                              form.save() #  edit_obj.update(clean_data)
                              return redirect("/")
                          else:
                             return render(reqeust,{"form":form})