rails decorator

Python decorator learned a few, more difficult to understand, close-up this blog analysis of the principles and examples of adorners:First, the concept of adornersThe Python adorner is a function that expands the function of the decorated function (usually a higher-order function, which accepts the adorner function as an argument), and the function is special because its return value is also a function. The advantage of using the Python adorner is tha

If the reader has developed a rails based application, but there is a lot of confusion about the data transfer between MVC, congratulations, this article is about summarizing the methods and techniques of the rails data transfer. Ruby on Rails 3 (collectively, rails 3) is the current major release, and the content and

[C ++ design mode] decorator modifier Mode Example in head first: there are various coffee drinks in a coffee shop. You can add a variety of spices to the coffee to become another kind of beverage, if you use the inheritance method to design a class for each beverage, the complexity of the Code is easily expanded and inherits all the features of the parent class. Because the inheritance is the static nature introduced by the type, this lack of flexibi

The use of the decorator is an advanced technique in Python Programming. here we have organized 12 steps into the use of the decorator in Python. if you need a decorator, see decorator) is an advanced Python syntax. The decorator can process a function, method, or class. In

Original: fanix Decorator is often translated into "decoration". I think decorator is used to paint a painter, so the object to be painted is called decoratee. these two entities are required in the decorator mode. Decorator definition:Dynamically add some additional responsibilities to an object, just like painting on

definition Decorator Mode: Dynamically attaching responsibilities to objects without changing the original class file and not using inheritance, thereby enabling the ability to dynamically expand an object. It is by creating a wrapper object that is decorated to wrap the real object. Design Principles To use the decorator pattern, the following design principles need to be met:1, multiple use combination,

Problem During OO design and development, the following situations may occur frequently: we need to add new responsibilities (Operations) for a defined class ), in general, we will define a new class to inherit the custom class, but solving this problem through inheritance brings about the complexity of the system, because the depth of inheritance will become very deep. The Decorator provides a method to add responsibilities to the class, not through

definition: dynamically adds some additional responsibilities to an object. Decorator mode is more flexible than generating subclasses in terms of adding functionality. Type: Object-structured pattern alias : Packing mode (wrapper) class Diagram: The decorator decoration pattern is a structured pattern that solves the problem of "excessive use of inheritance to extend the functionality of an object", whic

Decorator is often translated into "decoration", I think the translation of "painter" more image point, painter (decorator) is used to brush paint, then the object of painting paint we call decoratee. Both of these entities are required in decorator mode. Decorator definition: Dynamically adds some extra responsibilit

Reprinted: http://www.5itjob.net/html/86/86_itemid_1183.html Ruby on Rails is a relatively new web application.ProgramFramework, built on the ruby language. It is promoted as an alternative to the existing enterprise framework, and its goal, in short, is to make life, at least web development, easier. In this article, Aaron rustad compares some key architecture features of rails and traditional J2EE

Decorator is often translated into "decoration". I think decorator is used to paint a painter, so the object to be painted is called decoratee. these two entities are required in the Decorator mode. Decorator definition:Dynamically add some additional responsibilities to an object, just like painting on the wall. Using

This paper analyzes the MVC architecture of Rails 3 and discusses the methods and techniques of data transfer between the controller and view of Rails 3, controller and model, view and layout, and multiple views. Assuming you have a basic understanding of Ruby on Rails, you can at least configure Ruby on rails and run

Reprint, original link http://linux.cn/portal.php?mod=viewaid=170 using Ubuntu to build a Ruby on Rails Local development environment Want to develop a Ruby on Rails app? Although there are already some (beginner) Ruby on Rails tutorials, there seems to be some uncertainty about how to build a clean and updated local development environment.This tuto

Decorator has been introduced in my previous blog about Python 2.4 features, but that was Tiger, and now I'll take a closer look at its use. A detailed introduction to decorator in Python 2.4 is already introduced in what's new, so you can take a look. How to call Decorator Basically call decorator there are two forms

12. How to Use the decorator in Python, pythondecorator Decorator is an advanced Python syntax. The decorator Can process a function, method, or class. In Python, we have multiple methods to process functions and classes. For example, in the Python closure, we can see the function object as the return result of a function. Compared with other methods, the

of child classes increases (the number of extended functions), the combination of various child classes (the combination of extended functions) will lead to the expansion of more child classes (more inheritance ). How can we enable "extension of object functions" to be implemented dynamically (that is, runtime) as needed? At the same time, avoid the subclass expansion problem caused by "more extended functions? So that the impact caused by any "function scaling changes" is minimized? Intent) D

Decorator Mode descriptionDescription: A class to dynamically modify the function object of another class before or after the modification, give it some additional functions; This is the decoration of a class object function, decorated class with the decorated class, requires the same Access interface method (function), which in the dynamic object-oriented class, generally to implement the same interface (interface) to constrain the implementation; Th

The adorner was first presented in Python 2.5, and it was originally used for processing functions and methods such as callable objects (callable object, which are defined as __call__ methods). In Python 2.6 and later Python versions, adorners are further used to process classes. This is found in many places: @app. Route ('/')Def hello_world ():Return ' Hello world! ' Call the function before adding a @ What the hell, it turns out to be using a python d