django model.form

一.

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()

modefform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:

        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")])写死的
                            publish=forms.ModelChoiceField(queryset=Publish.objects.all())
                            authors=forms.ModelMultipleChoiceField(queryset=Author.objects.all())
      
               '''

逻辑:

添加书籍

def add(request):

if GET:

form=BookModelForm()

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

          '''
                          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>
                          '''

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})