from django.shortcuts import render, redirect,HttpResponse # Create your views here. from django.forms import widgets as wid from django.forms import ModelForm from .models import * class BookForm(ModelForm):     class Meta:         model = Book         fields = "__all__"         labels = {"title": "书籍名称", "price": "价格"}         widgets = {
               "title": wid.TextInput(attrs={"class": "form-control"}),             "price": wid.TextInput(attrs={"class": "form-control"}),             "date": wid.TextInput(attrs={"class": "form-control", "type": "date"}),             "publish": wid.Select(attrs={"class": "form-control"}),             "authors": wid.SelectMultiple(attrs={"class": "form-control"}),         }         error_messages = {
               "title": {"required": "不能为空"}         } def booklist(request):     book_list = Book.objects.all()     return render(request,"booklist.html",locals()) def add(request):     if request.method == "POST":         form = BookForm(request.POST)         if form.is_valid():             form.save()             return redirect("/booklist/")         else:             return render(request,"add.html",locals())     form = BookForm()     return render(request,"add.html",locals()) def edit(request,edit_book_id):     edit_book = Book.objects.filter(pk=edit_book_id).first()     if request.method == "POST":         form = BookForm(request.POST, instance=edit_book)         if form.is_valid():             form.save()  # edit_book.update(request.POST)             return redirect("/booklist/")     form = BookForm(instance=edit_book)     return render(request,"edit.html",locals()) def delete(request,delete_book_id):     if delete_book_id:         Book.objects.filter(pk=delete_book_id).first().delete()         return redirect("/booklist/")     else:         return HttpResponse("数据不存在，出错了")