SpeciesFileGroup/taxonworks

module Otu::MatrixHooks

  extend ActiveSupport::Concern

  # These row items used to include this item as a member 
  def member_of_old_matrix_row_items
    return [] unless taxon_name_id_changed? && taxon_name_id_change.first
    TaxonName.find(taxon_name_id_change.compact.first).coordinate_observation_matrix_row_items
  end

  # These row items now include this item as a member 
  def member_of_new_matrix_row_items
    return [] unless taxon_name_id_change && taxon_name_id_change.last
    TaxonName.find(taxon_name_id_change.last).coordinate_observation_matrix_row_items
  end  

end