rails decorator

Decorator mode1. Intention: to dynamically add some additional responsibilities to an object. For added functionality, the decorator mode is more flexible than generating subclasses. This mode extends the functionality of the object in a transparent manner to the client.2. Applicable environment(1) Add responsibilities to a single object in a dynamic, transparent manner without affecting other objects.(2) t

1. Problems arising from successionIntroduction: Said Brother Wai that year entrepreneurial open shop-selling soy milk! Because of pure soy milk, branch almost Bloom County City all village, because the development is too fast, so eager to achieve a computer-managed automated accounting system.Ingredients: Soy milkIngredients: sugar black bean grain eggs ..., add the same ingredients add money, each kind of soy milk prices are different. But they are based on the price of soy milk to increase. C

3. Decorator Mode　　The decorator mode dynamically attaches responsibility to the object. To extend functionality, decorators provide a more resilient alternative than inheritance.I. Problem INTRODUCTION　　Coffee Shop Class Design:A beverage base class, a variety of beverage classes inherit this base class and calculate their price.To add a variety of spices in the beverage, consider adding some Boolean varia

Decorator Mode Decorator mode, also known as Wrapper mode [GOF95]. The decoration mode extends the object functions in a transparent way to the client. It is an alternative to the inheritance relationship. Introduction Sun Wukong has a change, and each of his changes brings him an additional skill. When he becomes a fish, he can swim in the water; when he becomes a sparrow, he can fly in the sky. However,

Previously did not contact the decorator mode, yesterday, a brief study, record, for further study bedding, just contact, there is no place to welcome you correct.First, what is decorator mode?For example, it is like a production line of cake, you can not use this assembly line to produce cars, not to produce tanks, of course, you can not produce. Your cake is produced, to save it, to sell it, you can not p

decorator Pattern Definition 　　　 The responsibility is dynamically attached to the object. To extend functionality, decorators provide a more resilient alternative than inheritanceImplementing a class Diagram　　　　features of decorator modeA decorator and a decorated object have the same super-type . ( Note that this is the use of inheritance to achieve "type match

Introduced The decorator pattern dynamically attaches responsibility to the object. To extend functionality, adorners provide a more flexible alternative than inheritance. Mind Mapping There is such a project to make a restaurant reservation system. The original code structure is like this. There are a lot of beverage inherited classes, now the problem is that the price of milk is going up, then all the related classes, we have to adjust, such

/* Decorative mode is one of the structural design patterns that dynamically extends the functionality of an object without changing the class file and using inheritance, and is one of the alternatives to inheritance. It wraps the real object by creating a wrapper object, which is the decoration. Definition: To dynamically add some additional responsibilities to an object, the adornment pattern is more flexible than generating subclasses in terms of adding functionality. In decorating mod

When talking about the decorator mode, we often mention the java. IO Design Mode. As a flexible and scalable class library, JDK uses a large number of design patterns. The research on Patterns in JDK not only increases the understanding of patterns, it also helps you to better understand the structure and composition of the class library. In the java. Io package, the decorator mode is used for outputstream,

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 adorne

This article is in the study summary, welcome reprint but please specify Source: http://blog.csdn.net/pistolove/article/details/515315191. DefinitionDynamically adds responsibilities to the object. To extend functionality, Decorator mode provides a more flexible alternative than inheritance. (from the 91st page of Head First Chinese edition)2. DescriptionTypically, the behavior of using inheritance design subclasses is statically determined at compile

Detailed explanation of Python decorator from simple to deep, detailed explanation of python from simple to deep The functions and names of the decorator are different in many languages. In fact, it represents a design model and emphasizes the principle of openness and closure, it is more used for later functional upgrades than for writing new code. The decorator

Python decorator mode and Aspect-Oriented Programming details, python aspect Let's discuss the decorator today. The decorator is a well-known design model and is often used in scenarios with cut-plane requirements. It is more classic in terms of log insertion, performance testing, and transaction processing. The decorator