ModelForm

1.

1.views.py
from django.shortcuts import  render,HttpResponse
from app01 import models
from django import forms
from django.forms import fields as F
from django.forms import widgets as M


#Form验证
#UserInfo->Form->BaseForm(is_valid....)
#UserInfoModelForm->ModelForm-BaseModelForm->BaseForm(is_valid...)

class UserInfoModelForm(forms.ModelForm):
    class Meta:
        model = models.UserInfo   #指定去某个model类里面获取字段
        fields = '__all__'       #展示所有字段
        #fields = ['username','email']   #指定展示某几列
        #exclude = ['username']    #不显示哪列
        # labels = {               #添加输入框名称
        #     'username':'用户名',
        #     'email':'邮箱'
        # }
        help_texts = {             #添加帮助信息
            'username':'请输入用户名',
            'email':'请输入邮箱',
        }
        widgets = {                #修改输入框相关属性
            'usernmae':M.Textarea(attrs={'class':'c1'})
        }

        error_messages = {
            '__all__':{},   #整体错误信息
            'email':{          #自定义错误信息
                'required':'邮箱不能为空'
            }
        }
        # field_classes={   #修改表单的正则表达式验证,此处把邮箱格式的表达式验证改成了URL的表达式验证
        #     'email':F.URLField  #<----只能填"类"
        # }
        #<ul class="errorlist"><li>usertype<ul class="errorlist"><li>This field is required.</li></ul></li><li>email<ul class="errorlist"><li>邮箱不能为空</li></ul></li><li>username<ul class="errorlist"><li>This field is required.</li></ul></li></ul>
def index(request):
    if request.method=="GET":
        obj = UserInfoModelForm()
        return render(request,'index.html',{'obj':obj})
    elif request.method=="POST":
        obj =UserInfoModelForm(request.POST)
        print(obj.is_valid())   #返回True
        print(obj.cleaned_data) #返回{'email': 'dfdfdf@153.com', 'usertype': <UserType: UserType object>, 'username': 'dfd'}
        print(obj.errors)       #返回错误信息  <ul class="errorlist"><li>username<ul class="errorlist"><li>This field is required.</li></ul></li></ul>
        if obj.is_valid():
            obj.save()  #如果验证成功,保存现有数据到数据库
            #obj.save() 等于如下内容相加的结果：
            #instance = obj.save(False)    
            #instance.save()    #只保存到用户表中
            #obj.save_m2m()     #保存到多对多关系表中 app01_userinfo_u2g  
        return render(request,'index.html',{'obj':obj})


def user_list(request):
    #li=models.UserInfo.objects.all().select_related('user_type','u2g')   #<---加u2g会报错
    li = models.UserInfo.objects.all().select_related('usertype')
    return render(request,'user_list.html',{'li':li})


def user_edit(request,nid):
    #获取当前所有数据
    #显示用户已经存在的数据

    if request.method == "GET":
        user_obj = models.UserInfo.objects.filter(id=nid).first()
        mf = UserInfoModelForm(instance=user_obj)
        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():
            mf.save()
        else:
            print (mf.errors.as_json())

        return render(request,'user_edit.html',{'mf':mf,'nid':nid})

2.models.py
from django.db import models

class UserType(models.Model):
    caption = models.CharField(max_length=32)

class UserInfo(models.Model):
    username = models.CharField(max_length=32)
    email = models.EmailField()
    usertype = models.ForeignKey(to='UserType',to_field='id')
    u2g = models.ManyToManyField('UserGroup')

class UserGroup(models.Model):
    name = models.CharField(max_length=32)
3.user_edit.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form method="POST" action="/edit-{{ nid }}/">
        {% csrf_token %}
        {{ mf.as_p }}
        <input type="submit" value="提交">
    </form>
</body>
</html>

4.user_list.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <ul>
        {% for row in li %}
            <li>{{ row.username }}-{{ row.usertype.caption }}-<a href="/edit-{{ row.id }}/">编辑</a></li>

        {% endfor %}
    </ul>
</body>
</html>

5.urls.py
from django.conf.urls import url
from django.contrib import admin
from app01 import views

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^index/', views.index),
    url(r'^userlist/', views.user_list),
    url(r'^edit-(\d+)/', views.user_edit),

]

 

posted @ 2017-04-28 16:28  jidi_78  阅读(84)  评论(0)    收藏  举报