Module: Base4R::ItemAttributeMethods::ClassMethods

Defined in:
lib/item.rb

Instance Method Summary collapse

Instance Method Details

#attribute_definition(name) ⇒ Object

return the attribute definition for a specific attribute


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# File 'lib/item.rb', line 60

def attribute_definition(name)#:nodoc:
  attribute_definitions[name.to_sym]
end

#attribute_definitions ⇒ Object

return all actual and inherited definitions


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# File 'lib/item.rb', line 52

def attribute_definitions#:nodoc
  @all_attribute_definitions ||=
    (superclass.respond_to?(:attribute_definitions) ?
      superclass.attribute_definitions :
      {}).merge(@attribute_definitions||{})
end

#define_attributes(options) ⇒ Object

set the attribute definitions and define setters and getters


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# File 'lib/item.rb', line 28

def define_attributes(options)
  @attribute_definitions ||= {}
  @attribute_definitions.update(options)
  options.each {|k,v| define_setter_method(k, v)}
end

#define_child_accessor(parent, child) ⇒ Object

Define setter and getter methods. The example will define author_name and author_name=

define_child_method :author, :name


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# File 'lib/item.rb', line 44

def define_child_accessor(parent, child)
  class_eval <<-EOF
    def #{parent}_#{child};     child_value(:#{parent}, :#{child});        end
    def #{parent}_#{child}=(v); set_child_value(:#{parent}, :#{child}, v); end
  EOF
end

#define_setter_method(method, options = {}) ⇒ Object

define setter methods on the object


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# File 'lib/item.rb', line 35

def define_setter_method(method, options={})
  class_eval <<-EOS, __FILE__, __LINE__
    def set_#{method}(value); add_attribute(:#{method}, value); end
    alias_method "#{method}=", "set_#{method}"
  EOS
end