005---书籍添加和编辑的提交数据

添加和编辑两个视图函数只写了get请求渲染的页面。提交数据是post请求，所以要修改view.py。

book_add.py

 1 def book_add(request):
 2     if request.method == "POST":
 3         title = request.POST.get('title')
 4         price = request.POST.get('price')
 5         pub_date = request.POST.get('pub_date')
 6         publish_id = request.POST.get('pubs')
 7         author_id_list = request.POST.getlist('authors')  # 多选用getlist取
 8         book_obj = Book.objects.create(title=title, price=price, pub_date=pub_date, publish_id=publish_id)
 9         book_obj.author.add(*author_id_list)
10         return redirect('index')
11 
12     pub_lt = Publish.objects.all()
13     author_lt = Author.objects.all()
14     return render(request, 'book_add.html', {"pub_list": pub_lt, "author_list": author_lt})

说明：

增加了post请求分支，如果是post请求，就走post里面的代码
获取前端form传来的数据，request.POST.get()，因为author是多选，有多个值所以用getlist
在数据库中创建一条书籍记录。绑定多对多关系，book_obj.author.add(*author_id_list)
重定向到inex页面。因为添加了别名，所以可以这样使用

book_edit.py

 1 def book_edit(request, book_id):
 2     book = Book.objects.filter(pk=book_id).first()
 3     if request.method == "POST":
 4         title = request.POST.get('title')
 5         price = request.POST.get('price')
 6         pub_date = request.POST.get('pub_date')
 7         publish_id = request.POST.get('pubs')
 8         Book.objects.filter(pk=book_id).update(title=title, price=price, pub_date=pub_date, publish_id=publish_id)
 9         author_id_list = request.POST.getlist('authors')  # 多选用getlist取
10         
11         # 多对多更新
12         book.author.set(author_id_list)
13         return redirect('index')
14     pub_lt = Publish.objects.all()
15     authors = Author.objects.all()
16 
17     return render(request, 'book_edit.html', {"book": book, "pub_list": pub_lt, "author_list": authors})

说明：

基本和添加的逻辑一样，只是入库的时候不一样。

更改完，我们的添加和编辑就能生效了。但是代码一样的多啊，，，好多重复的，还有更高级的用法：

你看看就行了，这有就入库了。

 1 def book_add(request):
 2     if request.method == 'POST':
 3         form = BookForm(request.POST)
 4         if form.is_valid():
 5             form.save()
 6             return redirect('/books/')
 7     form = BookForm()
 8     return render(request, 'book_add.html', locals())
 9 
10 
11 def book_edit(request, edit_book_id):
12     book_obj = Book.objects.filter(pk=edit_book_id).first()
13     if request.method == 'POST':
14         form = BookForm(request.POST, instance=book_obj)
15         if form.is_valid():
16             form.save()
17             return redirect('/books/')
18     form = BookForm(instance=book_obj)
19     return render(request, 'book_edit.html', locals())