ruby - Best Way to initialize a instance variable in Rails -

i'm having trouble initializing instance variables in rails, need use variable in different methods, needs initialized beforehand, eg:

class test < activerecord::base       @test = 1    def testing     @test+1   end     end  t = test.new t.testint

i follow error:

test.rb:4:in `testar': undefined method `+' nil:nilclass (nomethoderror)     test.rb:9:in `<main>'

is there more elegant way initialize variable without using after_initialize?:

if dont want use after_initialize, create variable on fly:

attr_writer :test  def testing   self.test += 1 end  def test   @test ||= 0 end

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