class Book(models.Model):title=models.CharField(max_length=32)price=models.DecimalField(max_digits=8,decimal_places=2)pub_date=models.DateField()publish=models.ForeignKey("Publish")authors=models.ManyToManyField("Author")def __str__(self):return self.title

class BookModelForm(ModelForm):class Meta:1.#对应的Model中的类,对哪张表设置，就写哪张表model=models.Book2.#校验的字段#fields=["title","price","pub_date"]fields="__all__"3.自定义错误提示：error_messages = {'name':{'required':"用户名不能为空",},'age':{'required':"年龄不能为空",},}4.#widgets用法,比如把输入用户名的input框给为Textareafrom django.forms import widgets as wid #因为重名，所以起个别名widgets={"pub_date":wid.TextInput(attrs={"type":"date"})}5.labels，自定义在前端显示的名字labels= {"name":"用户名","price":"价格"}def clean_title(self):return self.cleaned_data.get("title")

def addbook(request):if request.method=="POST":form=BookModelForm(request.POST)if form.is_valid():form.save() # create方法  :BookModelForm.Meta.model.objects.create(**form.cleaned_data)   return redirect("/books/")else:return render(request, "addbook.html", locals())form=BookModelForm()return render(request,"addbook.html",locals())
addbook.html:      <form action="" method="post" novalidate>{% csrf_token %}{% for field in form %}<p><label for="">{{ field.label }}</label>{{ field }} <span>{{ field.errors.0 }}</span></p>{% endfor %}<input type="submit">
</form>

def changebook(request,id):edit_book = models.Book.objects.get(pk=id)if request.method=="POST":  form = BookModelForm(request.POST,instance=edit_book)if form.is_valid():form.save()  # update方法:  edit_book.update(form.cleaned_data)return redirect("/books/")else:return render(request, "addbook.html", locals())form=BookModelForm(instance=edit_book)return render(request,"changebook.html",locals())
changebook.html:

changebook.html:
<form action="" method="post">{% csrf_token %}{{ form.as_p }}<input type="submit">
</form>

from django.forms import ModelFormdef books(request):book_list=models.Book.objects.all()return render(request,"book_list.html",{"book_list":book_list})from django.forms import widgets as widclass BookModelForm(ModelForm):class Meta:model=models.Book#fields=["title","price","pub_date"]fields="__all__"labels={"title":"书籍名称","price":"价格"}error_messages={"title":{'required':"书籍名称不能为空",}},widgets={"pub_date":wid.TextInput(attrs={"type":"date"})}def clean_title(self):return self.cleaned_data.get("title")def addbook(request):if request.method=="POST":form=BookModelForm(request.POST)if form.is_valid():form.save() # create方法return redirect("/books/")else:return render(request, "addbook.html", locals())form=BookModelForm()return render(request,"addbook.html",locals())def changebook(request,id):if request.method=="POST":edit_book = models.Book.objects.get(pk=id)form = BookModelForm(request.POST,instance=edit_book)if form.is_valid():form.save()  # update方法  edit_book.update(request.POST)return redirect("/books/")else:return render(request, "addbook.html", locals())edit_book=models.Book.objects.get(pk=id)form=BookModelForm(instance=edit_book)return render(request,"changebook.html",locals())def deletebook(request,id):models.Book.objects.get(pk=id).delete()return redirect("/books/")

Views.py

'''
book_list
<ul>{% for book in book_list %}<li>{{ book.title }}---{{ book.price }}-----{{ book.publish.name }}<a href="/books/{{ book.pk }}/change/">编辑</a><a href="/books/{{ book.pk }}/delete/">删除</a></li>{% endfor %}
</ul>
changebook
<form action="" method="post">{% csrf_token %}{{ form.as_p }}<input type="submit">
</form>
addbook
<form action="" method="post" novalidate>{% csrf_token %}{% for field in form %}<p><label for="">{{ field.label }}</label>{{ field }} <span>{{ field.errors.0 }}</span></p>{% endfor %}<input type="submit">
</form>
'''

HTML