django model.form

一.

model的知识点

1              class UserInfo(AbstractUser):
2                     tel=models.CharField(max_length=32)
3                     gender=models.IntegerField(choices=((1,"男"),(2,"女")),default=1)
4              
5              yuan=UserInfo.objects.get(pk=1)
6              yuan.get_gender_display()

modelform

modefform使用

model.py:

 1             class Book(models.Model):
 2                 nid=models.AutoField(primary_key=True)
 3                 title=models.CharField(max_length=32)
 4                 price=models.DecimalField(max_digits=8,decimal_places=2) # 999999.99
 5                 pub_date=models.DateTimeField()  # "2012-12-12"
 6 
 7                 # comment_count=models.IntegerField(default=100)
 8                 # poll_count=models.IntegerField(default=100)
 9 
10                 publish=models.ForeignKey(to="Publish",on_delete=models.CASCADE)  # 级联删除
11                 authors=models.ManyToManyField(to="Author")
12                 def __str__(self):
13                     return self.title

复杂版

form.py:

 1         form.py:
 2                # 构建modelform
 3                class BookModelForm(forms.ModelForm):
 4                     class Meta:
 5                         model=Book
 6                         fields="__all__"
 7                         
 8                '''
 9                BookModelForm等同于：
10                     class BookForm(forms.Form):
11                             title=forms.CharField(max_length=32)
12                             price=forms.IntegerField()
13                             pub_date=forms.DateField(widget=widgets.TextInput(attrs={"type":"date"}))
14                             #publish=forms.ChoiceField(choices=[(1,"AAA"),(2,"BBB")])写死的
15                             publish=forms.ModelChoiceField(queryset=Publish.objects.all())
16                             authors=forms.ModelMultipleChoiceField(queryset=Author.objects.all())
17       
18                '''

完美版

逻辑:

添加书籍

def add(request):

if GET:

form=BookModelForm()

return render(reqeust,{"form":form})
渲染页面

 1           '''
 2                           渲染页面
 3                               <form action="" method="post" novalidate>
 4                                     {% csrf_token %}
 5                                       {% for field in form %}
 6                                             <div class="form-group">
 7                                                  <label for="title">{{ field.label }}</label>
 8                                                  {{ field }}
 9                                                  <span>{{ field.errors.0 }}</span>
10                                             </div>
11                                      {% endfor %}
12                                     <input type="submit" value="提交" class="btn btn-default pull-right">
13                               </form>
14                           '''

add.html

esle : POST 请求

form=BookModelForm(request.POST)

if form.is_valid():

form.save()

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)#加入instance等同于
                       if form.is_valid():
               form.save() #  edit_obj.update(clean_data)
              return redirect("/")
           else:
              return render(reqeust,{"form":form})