Django的Modelforms用法简介

from django.forms import ModelForm
 
 class Test(ModelForm):
   # 把那张表转化成form组件
   class Meta:
 
     # 这个意思即是把Article转化成form组件
     model = models.Article
 
     # 把表中的所有的字段都做转化，这里也可以传递一个list,可以指定显示某些字段
     fields = "__all__"
 
 # modelform组件的使用方法和forms组件的用法一样，但是i如果要保存出数据的时候,可以直接调用save方法保存就可以了，无论是单表，一对多，还是多对多
 
 
     # 如果增加数据
     # form = Test(request.POST)
     # if form.isvalid():
     #   form.save()
     # 这样就可以直接保存
 
 
 
 
     # 如果编辑数据，用下面的方法就可以把当前的对象的值渲染到form表单中，无论是单表，一对多，还是多对多
     # obj = models.Article.objects.all().first()
     # form = Test(instance=obj)
     # 上面是实现渲染数据到form表单
 
 
 
     # form = Test(request.POST,instance=obj)
     # if form.isvalid():
     #   form.save()
 
     # 这个就是实现更新操作，和增加操作唯一的区别就是通过instance传递一个要编辑的对象进去就可以了

def test_models(request):
  method = request.method.lower()
  if method == "get":
    body_list = []
    obj = models.Book.objects.all()
 
    head_list = models.Book._meta.get_fields()
 
    for i in obj:
      temp = []
      temp.append(i.bid)
      temp.append(i.title)
      temp.append(i.publish)
      temp.append(i.auther.all())
      body_list.append(temp)
    return render(request,"modelform_html1.html",locals())
  else:
    pass

class test(ModelForm):
class Meta:
model = models.Book
fields = "__all__"
labels = {"title":"书籍的名称","auther":"作者","publish":"出版社"}
error_messages = {
"title":{"required":"不允许为空",
"invalid":"格式错误"
}
}
widgets = {
"title":wd.TextInput(attrs={"placeholder":"密码"})
}
 
field_classes = {
"title":forms.EmailField
}

def add(request):
  method = request.method.lower()
  if method == "get":
    model_form_obj = test()
    for i in model_form_obj:
      print(i.label_tag(),"----------------------")
    return render(request,"modelfrom_add.html",locals())
 
  else:
    model_form_obj = test(request.POST)
    if model_form_obj.is_valid():
      model_form_obj.save()
 
      return redirect("/app2/test_models/")
    else:
      print("出错了")
      model_form_obj = test(request.POST)
 
      return render(request, "modelfrom_add.html", locals())

def edit(request):
  method = request.method.lower()
  book_obj = models.Book.objects.get(bid=int(request.GET.get("id")))
 
  if method == "get":
    model_form_obj = test(instance=book_obj)
    return render(request,"modelfrom_add.html",locals())
  else:
    model_form_obj = test(request.POST,instance=book_obj)
    model_form_obj.save()
    return redirect("/app2/test_models/")