Django框架【form组件】

from django.shortcuts import render,redirect

# Create your views here.

from .models import *

from django import forms
from django.forms import widgets



from django.forms import ModelForm

'''
class BookForm(forms.Form):
        # 原生form
        email=forms.EmailField()
        title = forms.CharField(max_length=32,label="书籍名称")
        price = forms.DecimalField(max_digits=8, decimal_places=2,label="价格")  # 999999.99
        date = forms.DateField(label="日期",
            widget=widgets.TextInput(attrs={"type":"date"})
        )
        #gender=forms.ChoiceField(choices=((1,"男"),(2,"女"),(3,"其他")))
        #publish=forms.ChoiceField(choices=Publish.objects.all().values_list("pk","title"))
        publish=forms.ModelChoiceField(queryset=Publish.objects.all())  # select
        authors=forms.ModelMultipleChoiceField(queryset=Author.objects.all())  # select
'''

from django.forms import widgets as wid
class BookForm(ModelForm):
    class Meta:
        model=Book
        fields="__all__"  # 部分字段写列表
        labels={"title":"书籍名称", "price":"价格"}  # 字典 指明字段
        
        # 设置样式
        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"}),
        }
        # 错误信息
        error_messages={
            "title":{"required":"不能为空"}
        }


def books(request):
    book_list=Book.objects.all()
    return render(request,"books.html",locals())


def addbook(request):
    if request.method=="POST":
        #  添加操作 create
        form = BookForm(request.POST)
        if form.is_valid():
            # 直接保存数据 包括跨表操作都已完成
            form.save()    # form.model.objects.create(request.POST)
            return redirect("/books/")
        else:
            return render(request, "add.html", locals())
    form=BookForm()
    return render(request,"add.html",locals())


def editbook(request,edit_book_id):
    edit_book = Book.objects.filter(pk=edit_book_id).first()
    if request.method=="POST":
        # 修改操作 对instance 这个对象进行update
        form = BookForm(request.POST,instance=edit_book)
        if form.is_valid():
            form.save()  # edit_book.update(request.POST)
            return redirect("/books/")
    
    
    # get 请求同样带着数据过去
    # 参数为 instance 对象
    form=BookForm(instance=edit_book)
    return render(request,"edit.html",locals())

form.html

<div class="col-md-4 col-md-offset-2">
        <form action="" method="post" novalidate>
            {% csrf_token %}
            {% for field in form %}
                <div>
                    {{ field.label }}
                    {{ field }} <span class="has-error">{{ field.errors.0 }}</span>
                </div>
            {% endfor %}
            <input type="submit" class="pull-right btn-success btn">
        </form>
    </div>