Module: Osheet::Associations::ClassMethods

Defined in:
lib/osheet/associations.rb

Instance Method Summary collapse

Instance Method Details

#hm(collection) ⇒ Object

A has many esque association helper

- will provide a collection reader
- will define a 'singular' item method for adding to the collection
- will support adding to the collection both by black and template



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# File 'lib/osheet/associations.rb', line 13

def hm(collection)
  unless collection.to_s =~ /s$/
    raise ArgumentError, "association item names must end in 's'"
  end
  plural = collection.to_s
  singular = plural.to_s.sub(/s$/, '')
  klass = Osheet.const_get(singular.capitalize)

  # define collection reader
  self.send(:define_method, plural, Proc.new do
    set_ivar(plural, []) if get_ivar(plural).nil?
    get_ivar(plural)
  end)

  # define collection item writer
  self.send(:define_method, singular) do |*args, &block|
    set_ivar(plural, []) if get_ivar(plural).nil?
    push_ivar(plural, if self.respond_to?(:workbook)
      # on: worksheet, column, row
      # creating: column, row, cell
      worksheet = self.respond_to?(:worksheet) ? self.worksheet : self
      if self.workbook && (template = self.workbook.templates.get(singular, args.first))
        # add by template
        klass.new(self.workbook, worksheet, *args[1..-1], &template)
      else
        # add by block
        klass.new(self.workbook, worksheet, &block)
      end
    else
      # on: workbook
      # creating: worksheet
      if (template = self.templates.get(singular, args.first))
        # add by template
        klass.new(self, *args[1..-1], &template)
      else
        # add by block
        klass.new(self, &block)
      end
    end)
  end

end