Module: Acts::AsOrderable::AddActsAsMethod

Defined in:
lib/acts_as_orderable.rb

Instance Method Summary collapse

Instance Method Details

#acts_as_orderable(*sources) ⇒ Object

Should new element be first || last



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# File 'lib/acts_as_orderable.rb', line 11

def acts_as_orderable(*sources)
  class_eval <<-END
    scope :ordered, ->{ order('element_order ASC') }
    after_create :init_me!
    include Acts::AsOrderable::InstanceMethods
  END

  options = sources.extract_options!.stringify_keys
  new_pos = options.delete("position")
  new_pos = (new_pos && new_pos.to_sym == :first) ? :first : :last

  parent_column = options.delete("tree_column")
  # Determine tree column (first from param - else check default acts_as_tree "parent_id")
  if self.table_exists?
    unless parent_column
      parent_column = 'parent_id' if self.column_names.include? 'parent_id'
    end
  end

  # Set class attributes
  cattr_accessor :new_element_position
  self.new_element_position = new_pos
  cattr_accessor :parent_column
  self.parent_column = parent_column

  # Define methods for assigning new parent - when we change parent
  # we need to be first or last element (according to new_el_pos)
  self.send(:define_method, :"#{parent_column}=") do |new_parent|
    old_parent = self.send(:"#{parent_column}")
    super new_parent
    # If object exist (been saved and we're just changing its parent)
    init_me! unless self.new_record? || old_parent.to_i == new_parent.to_i
  end if parent_column
end