rails decorator

Decorator Decorative Mode (structural mode)Subclass complex sub-class, how many subclassesJoin us we need to develop a tank for the game, in addition to different models of tanks, we also want to add a variety of features in different situations: such as infrared night vision function, such as water amphibious function, such as satellite positioning function and so on.Problem code: /// /// Abstract Tank /// Public Abstract class Tank

Adorner BasicsThe previous quick introduction to the adorner syntax, here, we will go deep inside the adorner working mechanism, more detailed and systematic introduction of the content of the adorner, and learn to write their own new adorners more advanced syntax.=================================================================================What is an adorner?Decorations are a way of specifying management code for functions and classes. The Python adorner is presented in two forms:The "1" fun

"Decorator Mode" in Java design modeDecoration mode The decoration of the new house does not change the nature of the house, but it can make the building more beautiful, more warm and more practical. In software design, the functions of existing objects (new houses) are extended (renovated). The common function is encapsulated in the adorner, where it is used to make the call. Adornment mode is a technique used in place of inheritance, which uses an a

No exception. Like all other open-source projects, if you want to enter the Ruby on Rails world, you will find very difficult, rarely documented, and scattered,The downloaded file lacks basic instructions. My personal experience is a typical example. If you don't talk nonsense, let's start with the following: 1. installation environment Ruby on Rails Website: http://www.rubyonrails.org/1. Download it here

Use Decorator mode (Decorator) dynamically adds some additional responsibilities to an object. For added functionality, the Decorator mode is more flexible than generating subclasses. Decorator mode is a structured pattern .structureFigure-Decorator modeComp

The JDK provides programmers with a large number of class libraries, in order to maintain the reusability, scalability and flexibility of the class library, which uses a large number of design patterns, this article will introduce the decorator mode used in the JDK I/O package, and use this pattern to implement a new output stream class. Introduction to Decorator Mode

The difference between static proxy and decorator mode:Let's take a look at the decorator pattern definition: Decorator mode dynamically attaches responsibility to the object. To extend functionality, decorators provide a more resilient alternative than inheritance. To summarize the use of decorator mode is to enhance

Several scenes First, let me take you through a few changingthepresent.org pages. I will show several places in the site that need to be cached. Then, we'll point out the choices we make for each of them and the code or strategy that we use to implement those pages. In particular, it will focus on the following topics: Full static page Completely dynamic page with almost no change Dynamic page Fragment Application Data Take a look at the static page first. Almost every site

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 is an excellent design for solving such problems. With the decorator, we

functionality during the run of the code, called "Adorner "(Decorator). Essentially, decorator is a higher-order function that returns a function. So, we want to define a decorator that can print the log, which can be defined as follows:Example one:1 2 def log (func): 3 def wrapper (*args,**kw):4print'call%s ()' % Func. __name__ 5 return func (*args,**kw)6return

A DefinedAn adorner is a function that adds extra functionality to an object, essentially a function. Its basic structure: higher order function + function nesting + closure. Basic knowledge explained: http://blog.51cto.com/10836356/2095118Two Adorners for simple classesLet's look at the simple class decorator, if we need to add a print function to any class, i.e., when the class is manipulated, print "defines a decorative class function", see:@

The invasion of Github is currently gaining popularity in foreign development circles. It seems that there is no message in the Chinese circle. Let me report what happened. By the way, I want to introduce one of the concepts that need to be paid attention to when developing Rails code .. What happened? The Rails master is congested by a hacker. To prove that Github can be intruded.Why will this happen (the

From: http://www.oreillynet.com/ruby/blog/2007/09/7_reasons_ I _switched_back_to_p_1.html By Derek Sivers in opinion Summary:I spent two years trying to make rails do something it wasn' t meant to do, then realized my old abandoned Language(PHP, in my case)Wocould do just fine if approached with my new rails-gained wisdom. Intro/background: Back in January 2005, I announced on the O 'Reilly blog that I was

Ruby on Rails ...... It has nothing to do with. net ...... The homepage is for more people to access Ruby on Rails ...... Withdraw tomorrow ...... Http://www.blogwind.com/Wuvist/16993.shtml By the way, I use Mac, and the cute editor used in blog Park has become a text area in safari. However, the latest version of cute editor is already compatible with safari to some extent ...... After reading the video o

It brings great opportunities for the development of Web solutions. This is the first article in the DB2 with Ruby on Rails series. The following articles mainly show you how to get started with the DB2 database and Ruby on Rails. In actual operations, the emergence of the Ruby language is combined with the powerful Rails framework, it brings great opportunities

Http://www.cnzzad.com/tut/69566.html Recommended:Start Network-Professional hosting and server sharing provider 17hz.net-5-year server shared rental boutique Service From: http://developer.51cto.com/art/200908/147276.htm It is difficult to install Ruby on Rails, but it is also very convenient. Development of applications based on RubyProgramYou must install Ruby, Gem, rails, and mongrel. H

Development Environment Construction in Windows This article describes how to build an RoR development environment in a Windows operating system. 1. Remote Installation A. Step 1: download and install the Ruby one-click installation package Download the latest Ruby 1.8.6 one-click installation package for http://rubyforge.org/frs? Group_id = 167. Download the package and run the installation file. The installation file is displayed on the page 2-1. 　　Figure 1 installation program running interfa

There are many popular frameworks for online Web application development at the moment. There are also many different types of frameworks, such as those with a large number of plug-ins that can make you faster iterations (such as Rails), or other very simple and low-level (like flask).Two relatively more popular frameworks in Web application development are Ruby on Rails and Laravel. All two of them are ver

[Mode overview] ---------- by xingoo Pattern intent Extension without changing the original class. It is more convenient to dynamically Add a business function to an object than to generate a subclass.Application scenarios 1. If no subclass is generated, add some operations dynamically for the object. 2. Handle unrecoverable responsibilities. 3. When the Child class cannot be used to expand.Mode Structure 　　ComponentExternal interface, used to define the form of external calls. Provides the de

Decorator in python What is a decoration device? Assume that all functions A, B, and C have been compiled. In this case, you find that A, B, and C all require the same function. What should you do? A: decorator The decorator is actually a function, but the return value of this function is a function. In my personal understanding, the