# 万物本源，你在写项目的时候，如果连最基本的原理都不懂，出了Bug你怎么解决
# 如果是在看不懂，只需要理解http通信原理就可以了，以后我会翻译Django网站部分内容并带大家解读Djaogo源码，如果那时候你还在看我的博客的话，你会发现现在这些都是A piece Of cake

"""lms URL Configuration

The `urlpatterns` list routes URLs to views. For more information please see:
    https://docs.djangoproject.com/en/1.11/topics/http/urls/
Examples:
Function views
    1. Add an import:  from my_app import views
    2. Add a URL to urlpatterns:  url(r'^$', views.home, name='home')
Class-based views
    1. Add an import:  from other_app.views import Home
    2. Add a URL to urlpatterns:  url(r'^$', Home.as_view(), name='home')
Including another URLconf
    1. Import the include() function: from django.conf.urls import url, include
    2. Add a URL to urlpatterns:  url(r'^blog/', include('blog.urls'))
"""
from django.conf.urls import url
from django.contrib import admin
from app01 import views

urlpatterns = [
    # 管理员账户登陆
    url(r'^admin/', admin.site.urls),
    # 出版社列表
    url(r'^publisher_list/', views.publisher_list),
    # 添加出版社
    url(r'^add_publisher/', views.add_publisher),
    # 删除出版社
    url(r'^drop_publisher/', views.drop_publisher),
    # 修改出版社
    url(r'^edit_publisher/', views.edit_publisher),
    url(r'^book_list/', views.book_list),
    url(r'^add_book/', views.add_book),
    url(r'^drop_book/', views.drop_book),
    url(r'^edit_book/', views.edit_book),
    url(r'^author_list/', views.author_list),
    url(r'^add_author/', views.add_author),
    url(r'^drop_author/', views.drop_author),
    url(r'^edit_author/', views.edit_author),
    url(r'^$', views.publisher_list),  # 只有跟网址，默认匹配
]

from django.shortcuts import render, redirect

# Create your views here.
from app01 import models


# 出版社列表
def publisher_list(request):
    # 查询
    publisher = models.Publisher.objects.all()  # ORM中的查询全部
    # 渲染
    return render(request, 'publisher_list.html', {'publisher_list': publisher})


# 添加出版社
def add_publisher(request):
    # POST请求表示用户已提交数据
    if request.method == 'POST':
        new_publisher_name = request.POST.get('name')
        models.Publisher.objects.create(name=new_publisher_name)
        return redirect('/publisher_list/')

    # 渲染待添加页面给用户
    return render(request, 'add_publisher.html')


# 删除出版社
def drop_publisher(request):
    # GET请求拿到url中的ID
    drop_id = request.GET.get('id')
    drop_obj = models.Publisher.objects.get(id=drop_id)
    drop_obj.delete()
    return redirect('/publisher_list/')


# 编辑出版社
def edit_publisher(request):
    if request.method == 'POST':
        edit_id = request.GET.get('id')
        edit_obj = models.Publisher.objects.get(id=edit_id)
        new_name = request.POST.get('name')
        edit_obj.name = new_name
        # 注意保存
        edit_obj.save()
        return redirect('/publisher_list/')

    edit_id = request.GET.get('id')
    edit_obj = models.Publisher.objects.get(id=edit_id)
    return render(request, 'edit_publisher.html', {'publisher': edit_obj})


# 书籍的列表
def book_list(request):
    book = models.Book.objects.all()
    return render(request, 'book_list.html', {'book_list': book})


# 添加本书籍
def add_book(request):
    if request.method == 'POST':
        new_book_name = request.POST.get('name')
        publisher_id = request.POST.get('publisher_id')
        models.Book.objects.create(name=new_book_name, publisher_id=publisher_id)
        return redirect('/book_list/')

    res = models.Publisher.objects.all()
    return render(request, 'add_book.html', {'publisher_list': res})


# 删除本书籍
def drop_book(request):
    drop_id = request.GET.get('id')
    drop_obj = models.Book.objects.get(id=drop_id)
    drop_obj.delete()
    return redirect('/book_list/')


# 编辑本书籍
def edit_book(request):
    if request.method == 'POST':
        new_book_name = request.POST.get('name')
        new_publisher_id = request.POST.get('publisher_id')
        edit_id = request.GET.get('id')
        edit_obj = models.Book.objects.get(id=edit_id)
        edit_obj.name = new_book_name
        edit_obj.publisher_id = new_publisher_id
        edit_obj.save()
        return redirect('/book_list/')

    edit_id = request.GET.get('id')
    edit_obj = models.Book.objects.get(id=edit_id)
    all_publisher = models.Publisher.objects.all()
    return render(request, 'edit_book.html', {'book': edit_obj, 'publisher_list': all_publisher})


# 作者的列表
def author_list(request):
    author = models.Author.objects.all()
    return render(request, 'author_list.html', {'author_list': author})


# 添加个作者
def add_author(request):
    if request.method == 'POST':
        new_author_name = request.POST.get('name')
        models.Author.objects.create(name=new_author_name)
        return redirect('/author_list/')
    return render(request, 'add_author.html')


# 删除个作者
def drop_author(request):
    drop_id = request.GET.get('id')
    drop_obj = models.Author.objects.get(id=drop_id)
    drop_obj.delete()
    return redirect('/author_list/')


# 修改下作者
def edit_author(request):
    if request.method == 'POST':
        edit_id = request.GET.get('id')
        edit_obj = models.Author.objects.get(id=edit_id)
        new_author_name = request.POST.get('name')
        new_book_id = request.POST.getlist('book_id')
        edit_obj.name = new_author_name
        edit_obj.book.set(new_book_id)
        edit_obj.save()
        return redirect('/author_list/')

    edit_id = request.GET.get('id')
    edit_obj = models.Author.objects.get(id=edit_id)
    all_book = models.Book.objects.all()
    return render(request, 'edit_author.html', {
        'author': edit_obj,
        'book_list': all_book
    })

 <tbody>
                        {% for publisher in publisher_list %}
                            <tr>
                                <td>{{ forloop.counter }}</td>
                                <td>{{ publisher.name }}</td>
                                <td class="text-center">
                                    <a class="btn btn-info btn-sm" href="/edit_publisher/?id={{ publisher.id }}"><i
                                            class="fa fa-pencil fa-fw"
                                            aria-hidden="true"></i>编辑
                                    </a>
                                    <a class="btn btn-danger btn-sm" href="/drop_publisher/?id={{ publisher.id }}"><i
                                            class="fa fa-trash-o fa-fw"
                                            aria-hidden="true"></i>删除
                                    </a>
                                </td>
                            </tr>
                        {% endfor %}


                        </tbody>

<select class="form-control" name="publisher_id">
                                        {% for publisher in publisher_list %}

                                            {# 如果当前循环到的出版社 和 书关联的出版社 相等 #}
                                            {% if publisher == book.publisher %}
                                                <option selected
                                                        value="{{ publisher.id }}">{{ publisher.name }}</option>
                                            {% else %}
                                                <option value="{{ publisher.id }}">{{ publisher.name }}</option>
                                            {% endif %}

                                        {% endfor %}
                                    </select>