    def convert_cell_config
      puts '-- Converting cells into unique fixed nestable elements.'

      YAML.load_file(cells_config_file).each do |cell|
        append_to_file Rails.root.join('config', 'alchemy', 'elements.yml') do
          <<-CELL.strip_heredoc

            - name: #{cell['name']}
              fixed: true
              unique: true
              nestable_elements: [#{cell['elements'].join(', ')}]
          CELL
        end
      end
    end