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())

<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>