django 视图中使用装饰器

写一个装饰器

import time


def timer(fn):
def inner(*args, **kwargs):
start = time.time()
ret = fn(*args, **kwargs)
print("函数执行时间是{}".format(time.time() - start))

return ret

return inner

FBV

# 添加出版社的处理函数
@timer
def add_press(request):
if request.method == 'POST':
# 表示用户填写完了，要给我发数据
# 1. 取到用户填写的出版社数据
press_name = request.POST.get('name')
# 2. 将数据添加到数据库中
Press.objects.create(name=press_name)
# 3. 跳转到出版社列表页面
return redirect('/press_list/')

# 1. 返回一个添加页面，让用户在上面填写新的出版社的信息
return render(request, 'add_press2.html')

CBV

from django.views import View

from django.utils.decorators import method_decorator


# @method_decorator(timer,name='post')
# @method_decorator(timer,name='get')
class AddPress(View):
# http_method_names = ['get','post']

@method_decorator(timer)
def dispatch(self, request, *args, **kwargs):
print('执行之前')
ret = super().dispatch(request, *args, **kwargs)
print('执行之后')
return ret

# @method_decorator(timer)
def get(self, request):
print('get')
print(self.request)
return render(self.request, 'add_press2.html')

# @method_decorator(timer)
def post(self, request):
print('post')
press_name = request.POST.get('name')
Press.objects.create(name=press_name)
return redirect('/press_list/')