ModelForm理解简单运用（增删改查）

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")