Instance variables on Ruby main class

» ruby » Instance variables on Ruby main class

By : user2957513

Date : November 24 2020, 01:01 AM

hop of those help? @name is an instance variable, @@name would be a class variable.
When you define an instance variable outside any explicit class definition, you implicitly are inside the Object space.

code :

➜  ~  irb
2.1.5 :001 > self.class
 => Object
2.1.5 :002 >

@name = 'learning metaprogramming!'

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Ruby: Accessing class instance variables from one class in another class's class method

By : user2752987

Date : March 29 2020, 07:55 AM

seems to work fine If you want to create a new type of initializer for BClass, you can do the following:

code :

class AClass
  attr_accessor :avar

  def initialize(input)
    @avar = input
  end
end

class BClass
  attr_accessor :bvalue

  def self.build(aclass)
    bclass = self.new
    bclass.bvalue = aclass.avar
    bclass
  end
end

aclass = AClass.new 'ruby'
bclass = BClass.build aclass

Should I use class variables or class-instance variables for class static variables in Ruby?

By : mrferdiex

Date : March 29 2020, 07:55 AM

With these it helps I recently discovered ActiveSupport defines class_inheritable_accessor, which does what the class-instance variables do with the advantage that objects are not shared across inheritance, and you can have a default value for the variable when subclassing.

code :

class Foo
  class_inheritable_accessor :x, :y
end

Foo.x = 1

class Bar < Foo
end

Bar.x #=> 1
Bar.x = 3
Bar.x #=> 3
Foo.x #=> 1

How can Ruby's attr_accessor produce class variables or class instance variables instead of instance variables?

By : user3773575

Date : March 29 2020, 07:55 AM

I wish this help you If I have a class with an attr_accessor, it defaults to creating an instance variable along with the corresponding getters and setters. But instead of creating an instance variable, is there a way to get it to create a class variable or a class instance variable instead? , Like this:

Class variables instance variables in Ruby

By : Melissa B. Laña

Date : March 29 2020, 07:55 AM

Hope this helps Ruby on Rails, in development mode, by default reloads your source files on each request. Since you're saving your "program"'s state in class variables, the changes get wiped out by the reloading of your classes.
By the way, class variables are normally used with much caution, as they are essentially global. Especially in a Rails web application. Save any state in a database, not in your classes' context.