models.py
from django.db import modelsclass UserType(models.Model):caption=models.CharField(max_length=32)class UserGroup(models.Model):name=models.CharField(max_length=32)class UserInfo(models.Model):username=models.CharField(verbose_name="用户",max_length=32)email=models.EmailField()user_type=models.ForeignKey(to='UserType',to_field="id",on_delete=models.CASCADE)  #关联UserType  一对一u2g=models.ManyToManyField(UserGroup)  #关联UserGroup 多对多

views.py
from django.shortcuts import render
from django import  forms
from django.forms import fields
from app_01 import modelsclass UserInfoForm(forms.Form):username = fields.CharField(max_length=32)email = fields.EmailField()user_type = fields.ChoiceField(choices=models.UserType.objects.values_list("id","caption")  #在页面上 把用户类型作为列表列上来了
    )def __init__(self,*args,**kwargs):            #自动更新操作super(UserInfoForm,self).__init__(*args,**kwargs)self.fields['user_type'].choices=models.UserType.objects.values_list("id","caption")def index(request):if request.method=="GET":obj=UserInfoForm()return render(request,"index.html",{'obj':obj})elif request.method=="POST":obj=UserInfoForm(request.POST)if obj.is_valid() :obj.save()     #验证成功 把所有的正确信息保存在数据库中return render(request,'index.html',{'obj':obj})index.html

"en">
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"/index/" method="post">{{ obj.as_p}}{% csrf_token %}"submit" value="提交" />

from django.shortcuts import render
from django import  forms
from django.forms import fields
from app_01 import modelsclass UserInfoModelForm(forms.ModelForm):class Meta:model=models.UserInfofields="__all__"   #代指所有的字段

　　　　# models.UserInfo.objects.create(**obj.cleaned_data)   #在数据库中自动进行创建
　　　　# models.UserInfo.objects.filter(id=1).update(**obj.cleaned_data)  #在数据库中自动进行更新

def index(request):if request.method=="GET":obj=UserInfoModelForm()return render(request,"index.html",{'obj':obj})elif request.method=="POST":obj=UserInfoModelForm(request.POST)if obj.is_valid() :obj.save()     #验证成功 把所有的正确信息保存在数据库中return render(request,'index.html',{'obj':obj})

Models.py
from django.db import modelsclass UserType(models.Model):caption=models.CharField(max_length=32)class UserGroup(models.Model):name=models.CharField(max_length=32)class UserInfo(models.Model):username=models.CharField(verbose_name="用户",max_length=32)email=models.EmailField()user_type=models.ForeignKey(to='UserType',to_field="id",on_delete=models.CASCADE)u2g=models.ManyToManyField(UserGroup)Views.py
def user_list(request):li=models.UserInfo.objects.all().select_related('user_type') #可以拿到UserInfo表内的数据，也可以拿到UserType表内的数据return render(request,'user_list.html',{'li':li})def user_edit(request,nid):if request.method=="GET":user_obj=models.UserInfo.objects.filter(id=nid).first()mf=UserInfoModelForm(instance=user_obj)  #这里不能瞎传 必须得有参数 instance   若无instance 则是在数据库内创建了一条数据，而不是直接对数据进行更改return render(request,'user_edit.html',{'mf':mf ,'nid':nid})elif request.method=="POST":user_obj = models.UserInfo.objects.filter(id=nid).first()mf = UserInfoModelForm(request.POST,instance=user_obj)if mf.is_valid():    #正确信息全部拿到mf.save()        #保存至数据库里else:print(mf.errors.as_json())return render(request, 'user_edit.html', {'mf': mf, 'nid': nid})user_list.html

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{% for row in li %}
{{ row.username }}-{{ row.user_type.caption }}-"/edit-{{ row.id }}/">编辑 
{% endfor %}

user_edit.html

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"UTF-8">

"/edit-{{ nid }}/" method="post">{% csrf_token %}{{ mf.as_p }}"submit" value="提交" />

urls.py
from django.contrib import admin
from django.urls import path
from app_01 import views
from django.conf.urls import url
import re
urlpatterns = [path('admin/', admin.site.urls),path('index/', views.index),path('user_list/', views.user_list),url(r'^edit-(\d+)/', views.user_edit)  #正则表达式
]