Django的Modelforms的介绍

   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/")