From: "Sebastjan H." <lists@...>
Date: 2012-08-03T07:38:38+09:00
Subject: Re: learning by doing part 2 - tc game

I am back with another question.

I am re-factoring the game and still trying to keep it simple, so bear 
with me. I've added effects to cards which are activated when played.

In the main file I have this for each turn:

  ## The cards effects are activated (opponent sequence is random)
  players = [@hm_player, @ai_player]
  @opponent = players.sample

  if @opponent == @ai_player
    @own = @hm_player
    hm_card.effect

    @opponent = @hm_player
    @own = @ai_player
    ai_card.effect

  elsif @opponent == @hm_player
    @own = @ai_player
    ai_card.effect

    @opponent == @ai_player
    @own = @hm_player
    hm_card.effect

  else

  end

------------------------
Now, I wanted to keep it simple, so I have the dragon's effect defined 
as follows:

  def effect()
  @opponent.hp -= card.attack # I've just spotted this error, where I 
refer to card and in the above code there is still hm_card
  end


When I run the game everything goes smoothly until the effect should be 
activated. I get this error:

dragon.rb:31:in `effect': undefined method `hp' for nil:NilClass 
(NoMethodError)
  from game_02.rb:126:in `<main>'

If I puts the opponent.hp it works though.

regards,
seba

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