From: Kamarulnizam Rahim <niezam54@...>
Date: 2011-02-01T07:40:19+09:00
Subject: class and inheritance. Inherit data

Hi guys,

I have a problem inheriting data from the parent class to its
subclasses. My code is as followed:

class Environmental
  def initialize
    convert_yaml = YAML::load_file('nizam.yaml')
  end
  def display
    #convert_yaml = YAML::load_file('nizam.yaml')
  end
end

class EnergyManagement < Environmental
  def initialize(title)
    @title = title
  end
  def display
    #convert_yaml = YAML::load_file('nizam.yaml')
    convert_yaml["System"]["Environmental"]["children"][2]["children"]
<< @title

    File.open("nizam_out.yaml", "w"){|f| YAML.dump(convert_yaml, f)}
  end
end

class WasteManagement < Environmental
  def initialize(title)
    @title = title
  end
  def display
    #convert_yaml = YAML::load_file('nizam.yaml')
    convert_yaml["System"]["Environmental"]["children"][3]["children"]
<< @title
    File.open("nizam_out.yaml", "w"){|f| YAML.dump(convert_yaml, f)}
  end
end

I want to use 'convert_yaml' for its subclasses (EnergyManagement and
WasteManagement) but when i run my code, 'convert_yaml' is not
recognized in the subclasses.

undefined local variable or method `convert_yaml' for
#<EnergyManagement:0x261d0b0> (NameError)

The reason i use this inheritance is because i want to write on the same
yaml file if both subclasses were called. Before this, i use
convert_yaml on every subclass but i found out that the yaml output
("nizam_out.yaml") file was overwritten if i call both subclasses at the
same time. Sorry if my explanation quite confusing as i do not know how
to explain this more clearly. Any help would be great. Thanks in
advance.

Nizam

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