rails decorator

An adorner (decorator) is an advanced Python syntax. Adorners can be used to process a function, method, or class. In Python, we have several methods for working with functions and classes, such as in Python closures, where we see the function object as the result of a function's return. With respect to other methods, the adorner has a simple syntax and a code with high readability. As a result, adorners are widely used in Python projects. The previo

The adorner in Python is a very useful thing, and we can write some specific methods and common methods into a decorator, which provides a great convenience for invoking these methods, thus improving the readability and simplicity of our code, as well as extensibility. Before learning the Python decorator, let's take a look at one of these examples: First, scope # coding:utf-8 msg = ' Hello test1 ' def Ad

Decorator Mode 1. Intention Dynamically add some additional responsibilities to an object. The decorator mode is more flexible than the subclass generation function. -- Wrapper. Two motivations Sometimes we want to add some functions to an object instead of the entire class. For example, a graphical user interface toolbox allows you to add some features to any user interface component, such as bor

Welcome everybody to put forward the opinion, discuss together! Reprint please indicate is quoted in http://blog.csdn.net/chenyujing1234 Example code: (Compilation tool: Eclipse) http://www.rayfile.com/zh-cn/files/1291b5bd-9418-11e1-b6a1-0015c55db73d/ Reference books: The decorator pattern (decorator [' dekəreitə] pattren) is the ability to dynamically extend an object without altering the original clas

Solved problems: We bought several abstract paintings when decorating our new home. After buying them, we found that some colored borders are more suitable for us, while some of them are more suitable for our use. How can we solve this problem? He needs to dynamically add additional responsibilities to other objects, which is the purpose of the Paster mode. We can add new functions to the original object by means of inheritance, but the decoration mode is more flexible than the subclass generati

. Solution 2: Later, we switched to the second solution to implement a separate additional function class to keep the original file system unchanged, so that some additional functions can be easily added on the client. The Code is as follows: [Cpp] // defines an object interface. You can dynamically add roles to these objects.Class FileSys{Public:Virtual ~ FileSys (){}Virtual void Operation (){}Protected:FileSys (){}};// Define a specific objectClass MyFileSys: public FileSys{Public:MyFileSys ()

Decorator often translated into "decoration", I think translated into "painter" more image point, painter (decorator) is used to brush paint, then painted objects we call decoratee. Both of these entities are required in the decorator mode.Decorator definition: Dynamically adds some extra responsibilities to an object, like painting on a wall. It is more flexible

What is decorator mode Decorator mode is a technique for adding features to a function or class, which allows us to add new capabilities and behaviors to it without modifying the original object. It is also essentially a function (in Javascipt, the class is just the syntactic sugar of the function).When are we going to get it? Let's assume a scenario where a bike shop has several models of bikes, and now th

Defined:The ability to dynamically extend an object without having to change the original class file and use inheritance. It is by creating a wrapper object, that is, decorating to wrap the real object.Overview:1. The decorator and the decorated object have the same super-type.2. You can wrap an object with one or more decorators.3. Since the decorator and the decorated object have the same super-type, in a

Function decorator of Python) Apply multiple decoration methods to one method:@ @ B @ C Def F (): # It is equivalent to the following form. Python calls the decoration method in sequence according to the application order (the last one is called first) Def F (): F = A (B (C (F ))) Decoration method analysis: Each decorator is only a method, which can be customized or built-in (for example, the built-in @ s

At first, I saw a lot of attractive applications about Ruby on Rails. Like many more eager programmers, I learned Ruby syntax and plunged into the beautiful palace of Rails, experience the sense of accomplishment of rapid Web application development, but I have to always be confused by lack of in-depth understanding of the Ruby language: Why does this class have nothing to do? Why does it work? What does th

Python: My Understanding of the decoratorWhen I first learned python, I didn't quite understand what the decorator is. I learned a little about it after reading a lot of blog posts and working on a lot of code. I understand that the decorator is to wrap it without changing the original function call, so that it can be used as another function, the general purpose is to insert logs, performance tests, and tr