Ruby

Martin Fowler: Of course (willing to spend half the time to write unit tests)! Because unit testing enables you to get your work done faster. Countless practices have proved this. The more stressful your time is, the more you have to write unit

Like most object-oriented languages, ruby classes also allow you to define class variables and methods. A class variable allows a single variable to be shared among all instances of a class. In Ruby, two @@ numbers are used to indicate class

Often we need to store and get data in a more transparent way. The Marshal module provides a simple object persistence, and the Pstore library is built on this technology. The DBM Library is used as a hash and is permanently stored on disk. 1

1 Dynamic Evaluate Code Global method Eval compiles and executes a string containing a snippet of Ruby code, which is a very strong mechanism because it allows you to build the runtime Code to execute. Look at the following example: Ruby Code

1 send a message to an object When you call a method, you send a message to an object, and in Ruby we can decide which method is invoked at runtime. This is what the Send method does, and he accepts a symbol as an argument. For a simple example,

1 Understanding Allocate In some special environments, you may want to create an object without invoking its constructor (i.e., initialize). That is, you want to create an empty object. For example, suppose you have an object whose state is

The Fruit class in the previous section has two real variables, describe the type and state of the fruit. Until a custom inspect method is written for this class, we understand that it does not make a reasonable explanation for a fruit that lacks

Tutorial we will talk about using Photoshop mouse to paint a lifelike ruby ring process, the completion of this work, although the need for a certain painting skills, but not too difficult, as long as we follow the study can be mastered. Let's take

This article is mainly about Ruby beginner notes Hello World, this article is a ruby self-study note, this article in the common method, function, class output Hello world, from one example to understand Ruby programming, need friends can refer to

This time we continue to test controller, or Store_controller. 1. Test the checkout function first to add code to STORE_CONTROLLER_TEST.RB: def test_checkout Test_add_to_cart get:checkout assert_response:success Assert_not_nil assigns ( :

The previous essays are written in accordance with the examples in the book, but, this time in the test model, according to the example of the book How the code can not go, so on the other way, this becomes a question. According to the book, at the

In the previous essay, we have added the input validation to the products creation page, this time the content is very simple, to slightly beautify the products of the list page. 1. Open the app\views\admin\list.rhtml file, you can see the

This article will focus on how to build a ROR development environment under different operating systems and, at the end, detail how to install and configure the MySQL database under Windows operating systems. Construction of development environment

Perhaps there is a situation where a record is associated with another record in a table, for example, every employee in the company has superiors and subordinates, and they are employees, and you can use the employee class in rails: Class

Many-to-many associations in rails are implemented by declaring Has_and_belongs_to_many in the class corresponding to the associated table. In a database, Many-to-many associations are implemented using an intermediate table, which includes the

The Active record provides two methods to get the number of records that match the criteria: count () and Count_by_sql (). For example: C1 = order.count C2 = Order.count (["name =?", "Dave Thomas"]) C3 = Lineitem.count_by_sql ("SELECT COUNT (*)" +

when a large array or collection needs to be looped, it can be a big disadvantage to put the data into memory at once. This is where lazy comes in handy. /span> Float::INFINITY 是无穷大意思举个例子

I 've been wondering why Microsoft has been so silent about Ruby on Rails. It should be said that the earthquake effect caused by Ruby on Rails within the Java camp over the past year is a very rare opportunity for Microsoft. Although Java has been

I recently started to read the Good Book Ruby on Rails developed by instructor Li Gang. It is a very good book and notes. I didn't use rails 2. 0, only useRails 1.2.6. 1) install rails 1.2.6Because it is used on the networkGem install rails --

Redis cluster building tutorial and troubleshooting, redis cluster building tutorial Here, the idea of building a redis pseudo cluster with six nodes on a Linux virtual machine is simple. Six redis instances are enabled on one virtual machine, and