decorator

问题 My questions refers to the following development stack: Rails 3.2.1 Draper 0.14 Ancestry 1.2.5 What I want to do is, deliver the navigation to my layout. So I've defined a before filter in my ApplicationController . class ApplicationController < ActionController::Base [..] before_filter :current_navigation [..] def current_navigation @n = PublicationDecorator.find(1) end end As you see in the code listing above, I'm using the draper . My PublicationDecorator isn't available in the

问题 I have a set of classes which have a habit of being called repeatedly with the same arguments. These methods generally run database requests and build arrays of objects and such, and so to cut out this duplication I've constructed a couple of caching methods to optimise. These are used like so: Before caching applied: public function method($arg1, $arg2) { $result = doWork(); return $result; } After caching applied: public function method($arg1, $arg2, $useCached=true) { if ($useCached)

问题 I'm trying to use a cached property decorator that can take arguments. I looked at this implementation: http://www.daniweb.com/software-development/python/code/217241/a-cached-property-decorator from functools import update_wrapper def cachedProperty (func ,name =None ): if name is None : name =func .__name__ def _get (self ): try : return self .__dict__ [name ] except KeyError : value =func (self ) self .__dict__ [name ]=value return value update_wrapper (_get ,func ) def _del (self ): self

问题 We have a lot of generic command handlers that are registered by Autofac in open-generic fashion. We have couple decorators that decorate all handles. Now I need to register a decorator for only one command handler and not affect all other command handlers. Here is my attempt on that, but I don't seem to get the registration right. Here is simple test code that is similar to our code: We have hundreds of commands working like this: class NormalCommand : ICommand { } // This command handler

问题 Say, I have a hand-crafted @login-required decorator: from functools import wraps def login_required(decorated_function): """Decorator to check if user is logged in.""" @wraps(decorated_function) def wrapper(*args, **kwargs): if False: # just to check it's working return decorated_function(*args, **kwargs) else: flash('You need to login, to access this page') return redirect(url_for('login')) return wrapper and a function, decorated with @app.route() and @login_required ( endpoint for login

问题 I am new to the IIS module and C# area. I need to modify the content of static HTML files in a specific directory of a website before the website sends the page content to client. The modification includes adding the banner, footer, etc. Based on my research, I should be able to achieve my goal through IIS Module (correct?). Here is my code: namespace MyProject { public class MyModule : IHttpModule { #region IHttpModule Members public void Dispose() { } public void Init(HttpApplication

问题 According to one of the comments in https://stackoverflow.com/a/8715790/210481, which I agree with, we should avoid multiple decorators if one depends on the other. So, in the example, if we have a decorator "active_required" for active users, we should not have to use both active_required and login_required on the same view. We should have "login_required" decorator "called" somehow inside the "active_required" one. Is it possible to do it with the standard "login_required" decorator that

问题 Let's have a class that has function that fails from time to time but after some actions it just works perfectly. Real life example would be Mysql Query that raises _mysql_exceptions.OperationalError: (2006, 'MySQL server has gone away') but after client reconnection it works fine. I've tried to write decorator for this: def _auto_reconnect_wrapper(func): ''' Tries to reconnects dead connection ''' def inner(self, *args, _retry=True, **kwargs): try: return func(self, *args, **kwargs) except

问题 Where is the source code for the decorator classmethod located in the python source code. Specifically I am having trouble finding the exact file it's defined in version 2.7.2 回答1: I am not answering what you asked - but below shows what could be a decorator equivalent to classmethod , written in Pure Python - since the one in the source code is in C, inside Python-2.7.2/Objects/funcobject.c as Mishna puts in his answer. So, the idea of class methods is to use the "descriptor" mechanism, as

问题 I get the following error: If you are migrating from Babylon/Babel 6 or want to use the old decorators proposal, you should use the 'decorators-legacy' plugin instead of 'decorators'. package.json "@babel/plugin-proposal-decorators": { "version": "7.1.2", "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-decorators/-/plugin-proposal-decorators-7.1.2.tgz", "integrity": "sha512-YooynBO6PmBgHvAd0fl5e5Tq/a0pEC6RqF62ouafme8FzdIVH41Mz/u1dn8fFVm4jzEJ+g/MsOxouwybJPuP8Q==", "requires": {