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ActiveRecord programming guide in Ruby on Rails, rubyonrails Avoid modifying the default ActiveRecord (Table Name, primary key, and so on) unless you have a very good reason (such as a database not under your control ).Put the macro-style method before the class definition (has_many, validates, and so on ). Preference has_expect: through is better than has_and_belongs_to_expect. Has_validation: through allo

This article mainly introduced the Ruby meta Programming Dream Lover Method_missing Method Detailed explanation, this article explained how I should use Method_missing, the method proxy, Define_method, when uses method_missing, the meta method and so on content , the need for friends can refer to the following I recently read some articles (such as this one) to promote the use of method_missing in

Objective As the RubyGnome2 library becomes more sophisticated and ruby1.9 performance improves, writing GUI programs with Ruby gradually turns from my hobby to an important part of my job. Writing a program in Ruby is really fun, and it allows you to quickly get your ideas in a graceful way. A gem described in this article is an example of a very interesting feature with very little code that makes it eas

Rescue star for spelling mistakes in Ruby programming: did_you_mean gem I often encounter spelling errors in Ruby development when class names or method names are misspelled. But I don't know it's just a spelling mistake. I will repeat it: "It's so strange. It looks okay ..." I often waste a lot of time on this kind of thing, but the reason m

, the File box command line, even the system variables, each time the new string from the pollution string operation, is also contaminated, can call tainted? () method to determine if it is contaminatedRuby security level, can be changed by modifying $safe global scalar, divided into 0-4, 5 levels0--is completely unconstrained, greater than 0,ruby will refuse to execute a contaminated string, greater than 2, will prohibit a large portion of file-relat

value with parentheses: Cat [Email protected]: ruby_src$./read.sh: 98765432DCBMust be curly braces Oh, otherwise read RET and Echo still in 2 process, equal to do not work Ah! You can do this:[Email protected]: ruby_src$my_val=$ (./read.sh)[Email protected]: Ruby_src$echo $my _val: 98765432DCBThis saves the returned results in the MY_VAL variable in the main bash process. Or you can handle it yourself in the while loop, because while loop and read are also in a process, the rewritten shell code

With many spells, Ruby has programming skills to implement many ingenious programming:Array parametersSurround aliasesWhiteboardClass extensionClass extension Mixedclass instance variableClass macrosClean roomCode processorContext ProbesDeferred executionDynamic distributionDynamic methodsDynamic AgentFlat scopesPhantom methodHook methodKernel methodsLazy instance VariableMimicry methodMonkey hit patch.....

My memory has been poor and I need to take a look at it. Today I will look at Ruby's object-oriented programming content and write down some of these concepts for future reference. Basic concepts: I. Local variables, global variables, instance variables (object variables), and class variables. II. Class Method and instance method (Object method ). 3. Inheritance. 4. Override method. 5. Reflection. Sat. Encapsulation. (Public, private, protected

Ruby calculates the maximum sum of Adjacent Elements in the array. Wei renyan 2010.8.21 I recently studied programming Pearl River and was very interested in the questions raised in the book. So according to the description in the book, I used Ruby to solve the related problems. The problems I learned today are as follows: This is a problem in Chapter 8th of

Most of Ruby's built-in types are similar to other programming languages. Mainly have strings,integers,floats,arrays and so on. However, only the scripting language, such as Ruby,perl, and awk provide support for built-in expression types. Shame: Regular expressions are a powerful text-processing tool, albeit covert. They are very different than simply adding an interface class library. A regular express

has all the instance methods of a. But let's think about what happened when we called @b.hi. Your ruby environment goes along the inheritance chain to find hi this way, in the end, just before throwing a nomethoderror, it tuned method_missing this method. In the example above, the situation is not bad, after all, there are two trivial classes to look for. But usually, we are programming in the context of

When asked this question today, it was always considered a broader concept, even though I have used these characteristics, but have never known this is called "meta programming" until today when people ask, just epiphany some, and then on the Internet and their own flat practical some metaprogramming make a small sum. The so-called metaprogramming in Ruby is the technique of manipulating language structure

Binding a distributed Logger with Ringydingy Ringydingy allows us to DRY up our server code a bit. We no longer have the remember a whole lot of messy rinda API calls. Instead, we can wrap it up with a line or both of ringydingy code. Let's look at our "distributed Logger" application to see how we can make it more DRY. Server Client Ring_server output Server output Client outpu

Adapter modeadapter patterns can be used to wrap different interfaces and to provide a unified interface, or to make an object look like an object of another type. In a static type of programming language, we often use it to satisfy the characteristics of a type system, but in a weakly typed programming language like Ruby, we don't need to do that. However, it st

178 Persisted AMQP Queues Subscribing to a Message Queue Topic Queues Fanout Queues Page 193 does not practice feeling completely do not look in ... Conclusion Endnotes The book is over for the time being. Basic is the first chapter of serious practice, the back is grass grass over again. Technical books do read a few more times to be able to digest better, and later use or have time to read it again. Thank the author for his har

This article mainly introduces the method_missing of Ruby Meta programming, this article introduces a phenomenon that causes death cycle when using method_missing, the friend who need can refer to the following We know the top-level domain, what is the self of the domain defined? The code is as follows: Puts self #main Puts Self.class #Object We know that when a method is invoked, if there is no object