rails decorator

First, Decorator mode introduction:Decorator mode-Dynamically adding additional responsibilities to an object in a transparent manner to the client, implementing the ability to dynamically expand the object's functionality when it is re-run, in a way that combines objects rather than inheritance, and provides more flexibility in increasing functionality than generating subclasses, as well as extending multiple functions as needed. Avoids the flexibili

In the introduction of JavaScript design mode, decorator mode is an alternative to the mixin (mixed) pattern, which is another feasible object subclass (Mixin mode).Decorator (Decorator) modeDefinition:Add additional functionality to the object dynamically. It is more streamlined to add (decorate) properties or methods to the base object, rather than subclass it.

Decorator mode (Structural Model) Dynamically attaches responsibility to the object in a transparent manner to the client. This mode provides a more flexible alternative to inheritance to extend the object function. Wrapper is essentially different from wrapper. The adapter needs to change the interface of the object to be considered, but does not necessarily change the performance of the object. The modifier wants to maintain the interface of th

Introduction The modifier mode dynamically attaches the responsibility to the object. To expand the functionality, the decorator provides an alternative solution that is more flexible than inheritance. Mind Map There is such a project as a restaurant ordering system. The initial code structure is as follows. There are many inheritance classes for Beverage. The problem is that the price of Milk has increased, so we need to adjust all the related cla

Decorator mode in. Net Framework. Please visit: Design Mode in. Net -- Decorator Mode I. Mode Overview In one scenario, we need to dynamically add new roles to an object. This role does not modify the original behaviors, but adds new functions based on the original behaviors, it is like a decoration worker applying colorful paint to a new wall.Starting from our object-oriented knowledge, we can add new res

Several advanced syntax concepts of Python (lambda expression closure decorator), pythonlambda 1. Anonymous FunctionsAnonymous function is a function that is not bound to any identifier. It is used in the functional programming ages field. Typical applications:1) passed as a parameter to the high-order function (higher-order function). For example, the built-in function filter/map/reduce in python is a typical high-order function.2) as the return valu

Image example: Mary should not ask her to pick her up after her birthday. Otherwise, the food expenses for this month will surely be finished. She took out the photo I took on the top of Huashan last year and wrote "the best gift" on the back, I love your FITA. "I went to the gift shop on the street and bought an image frame (the mm for selling gifts is also very beautiful ), mike, who is next door to art design, designed a beautiful box and installed it ......, We are all

In some cases, we may "over-use inheritance to extend the object's functions". This extension method lacks flexibility due to the static (compile-time) characteristics introduced by inheritance as a type; as the number 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 implement

Definition: dynamically attaches responsibility to the object. To extend functionality, adorners provide a more resilient alternative than inheritance. Class Diagram:　　Component: Define a docking interface that can dynamically add responsibilities to these objects;　　concretecomponent: Define a specific object, or you can add some responsibilities to the object;　　Decorator: Decorate abstract class, inherit the component, extend the function of componen

What is the decorator pattern (decorator)?Dynamically add some additional responsibilities to an object. Decorator mode is more flexible than generating subclasses in terms of adding functionality.first, the structure Component: defines an object interface that can dynamically add responsibilities to these objects. Interface Component {public void oper

After using the rails new appname to build rails applications, we can view the directory structure of Rails applications through tree: Directory structure The application directory will have 11 directories of App, config, DB, Doc, lib, log, public, script, test, TMP, and vendor, and config.ru, Gemfile, Gemfile.lock, Rakefile , Readme.rdoc, etc. 5 documents. Th

The dynamic nature of the Ruby language makes it simply not enough to learn rails simply by looking up the relevant API documentation, because the API documentation only records the methods of static code definitions, and many of the methods in rails are dynamically generated at load or run time, and you want to understand that these methods must read the source code. This article takes a method invocation

future of your framework? What changes will be convenient for user development? Will you support Ajax in the native way? Are you planning to support it?He believes that the JSF standard should be provided by a third party. JSF (2.0) provides "partial faces request", which is an Ajax implementation. JSF also enhances annotation build programming.5. Are there any rumors about your framework that need to be clarified? If so, what is it?Many JSF books use struts for comparison. He believes that thi

This tutorial is only suitable for Ubuntu Server to deploy the project to the line, it is recommended to use the same Ubuntu version, so as not to encounter some different versions of the problem. This tutorial is suitable for beginners to deploy Rails applications for the first time; This article tests through the environment Ubuntu 12.04 Server, Server installation tested on Linode

Ruby on Rails has been favored by more and more developers in the country in recent years, and rails applications have deepened from simpler internal systems to complex enterprise applications. Rails ' habit is better than configuration ' and many of the best technologies, such as ActiveRecord, greatly improve development efficiency, but

Recently took over a mobile phone project. In the process of setting up the environment, some problems have been encountered, recorded in the following, and a personal solution.Development environment Win2003; JetBrains RubyMine6.3.31, download the latest version of Ruby, (Rubyinstaller-2.0.0-p598.exe, the latest version)Official website:http://rubyinstaller.org/downloads/2. Install RubyDouble-click Install, the installation process appears the following interface.Here we choose the installation

(Salinepackage.class);public Salinepackage () {setdescription ("SalinePackage"); setprice (4.0f);} @Override publicfloatcost () { logger.info ("Thepancakeof{}costs{}yuan . ", getdescription (), getprice ()); returngetprice (); }} packagecom.raze.decorator.component.concrete;importorg.slf4j.logger;import org.slf4j.loggerfactory;importcom.raze.decorator.component.pancake;/*** Sweet Pancake *@ authordjm* @version 1.0*/publicclassSugarPancakeextends pancake{privatestaticfinallogger Logger=loggerf

Decorative mode is also known as packaging (Wrapper) mode. Adornment mode extends the functionality of the object transparently to the client, and is an alternative to the inheritance relationship. structure of the decoration mode　　Decorating mode dynamically attaches more responsibility to an object in a transparent manner to the customer. In other words, the client does not feel that the object is different before and after decorating. Adornment mode expands the functionality of an objec

adornment mode is as shown.Component: interface of Component object, can add responsibility to these objects dynamically;Concretecomponent: A specific Component object that implements the component interface. This object is usually the original object decorated by the adorner, which can add responsibilities to the object;Decorator: The parent class of all adorners needs to define an interface that is consistent with the component interface (mainly fo

Decorator mode: 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 objectFeatures of decorative modes (1) The decorative object and the real object have the same interface. This allows the client object to interact with the adornment object in the same way as the real object.(2) Decorative objects include a reference