from django.db import models# Create your models here.
from django.db import models# Create your models here.
class Book(models.Model):title = models.CharField( max_length=32,verbose_name="书籍名称")pub_date=models.DateField(verbose_name="出版日期")price=models.DecimalField(max_digits=5,decimal_places=2,verbose_name="价格")publish=models.ForeignKey(to="Publish",to_field="id",on_delete=models.CASCADE,null=True,verbose_name="出版社")authors=models.ManyToManyField("Author",db_table="book2authors",verbose_name="作者") # 创建关系表def __str__(self):return self.titleclass Meta:verbose_name="书籍"

　form django import  forms

　from django.forms import  widgets as wid

from django.core.exceptions import NON_FIELD_ERRORS, ValidationError

class BookModelForm(forms.ModelForm):class Meta:model = models.Bookfields="__all__" #默认页面渲染时 显示所有的字段# fields=["title","price"] #需要显示的字段 

#错误信息error_messages={"title":{"required":"书名不能为空"},"price":{"required":"价格不能为空"},"pub_date":{"required":"日期不能为空"},"publish":{"required":"出版社不能为空"},"authors":{"required":"作者不能为空"},}

　　　　　#给渲染的input标签设置type类型和相关的属性

widgets={"title":wid.TextInput(attrs={"class":"form-control"}),"price":wid.TextInput(attrs={"class":"form-control"}),"pub_date":wid.DateInput(attrs={"class":"form-control","type":"date"}),}

　　　　　#字段别名设置labels={"title":"书籍名称",　　　　　　　}#钩子函数，进一步进行约束　　　#对title字段进行约束def clean_title(self):val=self.cleaned_data.get("title")if val.isdigit():raise ValidationError("书名不能为纯数字！")else:return val

　　#对price字段进行约束　　def clean_price(self):　　　　val=self.cleaned_data.get("price")　　　　if val.isdigit():　　　　　　return val　　　　else:　　　　　　raise ValidationError("价格必须为数字")

def addbook(request):if request.method=="POST":'''data=request.POST.dict()data.pop("csrfmiddlewaretoken")data.pop("author_list")book=models.Book.objects.create(**data)  #  保证提交键值对的键必须和数据库表字段一致#  为书籍绑定作者关系author_list=request.POST.getlist("author_list")print(author_list) # ['1', '2']book.authors.add(*author_list)'''form=BookModelForm(request.POST)if form.is_valid():form.save()return redirect("/books/")else:return render(request, 'addbook.html', locals())else:# form=BookForm()   # forms组件form=BookModelForm()       #  modelforms组件return render(request,'addbook.html',locals())

<div class="container-fluid"><div class="row"><div class="col-md-6 col-md-offset-3"><h3>添加{{ table_name }}</h3><form action="" method="post" novalidate>{% csrf_token %}{% for field in form %}<div><label for="">{{ field.label }}</label>{{ field }}<span class="error pull-right">{{ field.errors.0 }}</span></div>{% endfor %}<input type="submit" class="btn btn-primary"></form></div></div>
</div>

def editbook(request,edit_book_id):edit_book = models.Book.objects.filter(pk=edit_book_id).first()if request.method=="POST":# 方式1:# title=request.POST.get("title")# price=request.POST.get("price")# pub_date=request.POST.get("pub_date")# publish_id=request.POST.get("publish_id")# author_list=request.POST.getlist("author_list")# models.Book.objects.filter(pk=edit_book_id).update(title=title,price=price,pub_date=pub_date,publish_id=publish_id)  # update只有queryset才能调用# edit_book.authors.set(author_list)#  方式2:# data=request.POST.dict()# data.pop("csrfmiddlewaretoken")# author_list=data.pop("author_list")# models.Book.objects.filter(pk=edit_book_id).update(**data)  #  保证提交键值对的键必须和数据库表字段一致# #  为书籍绑定作者关系# author_list=request.POST.getlist("author_list")# edit_book.authors.set(author_list)# 方式3form = BookModelForm(request.POST,instance=edit_book)#编辑时，instance=edit_book 传进去就可以该对象信息在页面的展示，这是编辑和添加页面的区别之处if form.is_valid():，form.save()return redirect("/books/")else:return render(request, 'editbook.html', locals())else:form=BookModelForm(instance=edit_book)return render(request,'editbook.html',locals())

<div class="container-fluid"><div class="row"><div class="col-md-6 col-md-offset-3"><h3>编辑{{ table_name }}</h3><form action="" method="post" novalidate>{% csrf_token %}{% for field in form %}<div><label for="">{{ field.label }}</label>{{ field }}<span class="error pull-right">{{ field.errors.0 }}</span></div>{% endfor %}<input type="submit" class="btn btn-primary"></form></div></div>
</div>