rails decorator

Decorator mode: Dynamically extends the functionality of an object without changing the original class file and using inheritance. It is by creating a wrapper object, that is, decorating to wrap the real object.The role in decorator modeAbstract component: is an interface or abstract class, that is, the definition of the most core object, is also the most primitive object, this class is required to decorate

Problem focus: Sometimes, when you want a class to add new functions, a subclass is usually generated. However, this method is sometimes a little bloated. Secondly, this method is static and not flexible enough. Therefore, in response to this demand for dynamic addition of functions to objects, Daniel provides the decorator mode in this section.Intention: dynamically add some additional responsibilities to the next account. With the added function, th

Before you start About this tutorial Ruby on Rails (rails) is a full-stack WEB application framework written in Ruby, and Ruby is a rich, free, extensible, portable, object-oriented scripting language. Rails is very popular among WEB application developers. With it, you can quickly and efficiently develop Web applications and deploy them to any web con

coffee, coffee with sugar, coffee with milk. In essence, or coffee, but in the original thing, did "decorate", so that the addition of some features or features. For example logging, some functions need to be logged Stupid way, each function to add code, if the code changed, it is sad to rush Decorator, define a specialized logging adorner, decorate the desired function, and fix the advantages Extract the same code that is irrelevant to function itse

This chapter can be referred to as "giving love a new vision of the people who inherit." This chapter will learn how to use object composition to decorate classes at run time. Once you are familiar with decorating techniques, you will be able to assign new responsibilities to your (or others ') objects without modifying any of the underlying code. design principles : Classes should be open to extensions and closed to modifications. Let's start by looking at what the object enhancement means: In

1. The following two reasons are causing your Rails application to slow down: Ruby and rails should not be used as the preferred place for Ruby and rails. (with Ruby and Rails doing a job that's not good for doing) Excessive memory consumption leads to a lot of time for garbage collection.

Python decorator and pythondecorator I recently saw Liao Xuefeng's Python tutorial. For those who are studying Python, this is a good news. There is no lengthy nonsense, only the simplest language, and the clearest example. The following is my summary of the ornament section and my understanding. Note: [refer to the above tutorial for the code in this article] In many cases, I will integrate many Python syntaxes with C ++. In C ++, the function name i

Detailed description of the Python decorator mode and Aspect-Oriented Programming This article mainly introduces the Python decorator mode and Specific Aspect-oriented programming. In summary, the function of the decorator is to add additional functions for existing objects, this article details all aspects of the decorative device model, and then introduces the

Let's talk about the Python decorator mode and Aspect-Oriented Programming, python aspect Decorator mode and Aspect-Oriented Programming in Python 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 o

Install Ruby on Rails in Ubuntu 15.04 In this article, we will learn how to use rbenv to install Ruby on Rails in Ubuntu 15.04. We chose Ubuntu as the operating system because Ubuntu is an operating system with many packages and complete documents in the Linux release, so I think this is the right choice. If you have not installed the latest Ubuntu, you can start by downloading the iso file. Install Ruby Th

Ten years ago, the WEB application framework, rails founder David Heinemeier Hansson, had recorded a video showing us how to create a blog engine in 15 minutes using Ruby on rails. This video successfully demonstrates the efficiency of Ruby on Rails writing WEB application core functionality through the design of Rails

Recently because of an aurora push friend, I started about three or four days of the Rails learning path, the final level is to be able to make most of the functions more easily, and then self-feeling can freely follow the design of rails to think. Because of the growing popularity of programming, I have met more and more non-computer students to start writing code for hobbies, but most of them may be using

Continue to learn about the design model. Today, it is the decorator model. It belongs to the structural model. First, it is the basic concept: Decoration mode:Dynamically add some additional responsibilities to an object. The decorator mode is more flexible than the subclass generation function. Applicability: Add roles to a single object dynamically and transparently without

Design Pattern-decorator pattern, design pattern Decoration The decorator mode mainly embodies the principle of "opening to expansion and closing to modification" in the OO principle. The modifier mode has the following features: 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

Reference: skysky First, according to the Convention, the class diagram of the previous Subprogram The test procedure is as follows: Report zbo_dp_003_re. * The class and interface for this program Include zbo_dp_003_if_cl. * Reference Data for drink Definition Data: dr_ref type ref to drink. * Temp reference for decorator Data: TDR type ref to drink. Start-of-selection. * ----------------- Start decorate ---------------* * Narrowing cast * Create d

Decorator mode and its applicationtags (space delimited): Design Patterns in Java and Android applicationsA few days ago to see the great God's Android elegant for Recyclerview add Headerview and Footerview, find decorator mode in some cases is designed so elegant, now summarized as follows:This blog mainly explains a few questions What is decorator mode

This article mainly describes the Python decorator, iterator amp; Generator, re regular expression, and string formatting. if you are interested, refer to this chapter: Decorator Iterator generator Re regular expression String formatting Decorator The decorator is a well-known design model and is often used in scena

Explore some methods to optimize Ruby on Rails performance, rubyrails 1. There are two reasons for slowing down your Rails application: Ruby and Rails should not be used as the preferred choice. (I used Ruby and Rails to do something I was not good) Excessive memory consumption leads to a large amount of time for

I recently did not find any tutorials for getting started on Ruby on Rails. The others are all download of e-books, and the existing notes are just the most basic. Or some configuration tutorials. I read some information in practical rails social networking sites Ruby on RALs and thought it was good. I 'd like to write it out and share it with you. First, create a platform $

Ruby on Rails is a suddenly popular framework that acts as a catalyst for the ruby programming language. As Ruby experiences continue to succeed, developers began to seek to integrate their ruby applications with applications written in other languages. Rails provides excellent support for Web Services. This article introduces the Web service in rails, focusing o