How can one set property values when initializing an object in Ruby?

Question

Given the following class:

class Test
  attr_accessor :name
end

When I create the object, I want to do the following:

t = Test         


        

Answer 1

ok,

I came up with a solution. It uses the initialize method but on the other hand do exactly what you want.

class Test
  attr_accessor :name

  def initialize(init)
    init.each_pair do |key, val|
      instance_variable_set('@' + key.to_s, val)
    end
  end

  def display
    puts @name
  end

end

t = Test.new :name => 'hello'
t.display

happy ? :)

---

Alternative solution using inheritance. Note, with this solution, you don't need to explicitly declare the attr_accessor!

class CSharpStyle
  def initialize(init)
    init.each_pair do |key, val|
      instance_variable_set('@' + key.to_s, val)
      instance_eval "class << self; attr_accessor :#{key.to_s}; end"
    end
  end
end

class Test < CSharpStyle
  def initialize(arg1, arg2, *init)
    super(init.last)
  end
end

t = Test.new 'a val 1', 'a val 2', {:left => 'gauche', :right => 'droite'}
puts "#{t.left} <=> #{t.right}"