CODEWITHSUNDEEP
ruby-on-railsrubyruby-on-rails-3rubygems
Manish Das
Manish Das

Reputation: 3893

Getting value of an attribute within class method

i have a class method where i want to access the value of an attribute 

class Run

  attr_accessor :line

  def self.output(options={})
    station_no = options[:station]
    title = options[:title]
    line = self.line
    station = line.stations[station_no-1]
  end
end

within this class method i want to access value of line attribute and within class method i can't access the value of an attribute using self.line. So please suggest me how i can access.

Upvotes: 1

Views: 368

Answers (1)

Victor Deryagin
Victor Deryagin

Reputation: 12225

Class method is executed in class context and line is instance method, you can't directly access it from self.output.

Do you really want to access instance attribute from class method? Maybe what you need is class attribute. If so, you can declare it like this: 

class Run
  class << self
    attr_accessor :line
  end
end

, and will be able to get it's value within class method.

If you do need to access instance attribute from class method — pass that instance as argument to method and call accessor on it.

Upvotes: 5

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