_write_layout_method

# File actionview/lib/action_view/layouts.rb, line 281
      def _write_layout_method # :nodoc:
        silence_redefinition_of_method(:_layout)

        prefixes = /\blayouts/.match?(_implied_layout_name) ? [] : ["layouts"]
        default_behavior = "lookup_context.find_all('#{_implied_layout_name}', #{prefixes.inspect}, false, [], { formats: formats }).first || super"
        name_clause = if name
          default_behavior
        else
                      super
        end

        layout_definition =            case _layout
          when String
            _layout.inspect
          when Symbol
                          #{_layout}.tap do |layout|                return #{default_behavior} if layout.nil?                unless layout.is_a?(String) || !layout                  raise ArgumentError, "Your layout method :#{_layout} returned \#{layout}. It " \                    "should have returned a String, false, or nil"                end              end
          when Proc
            define_method :_layout_from_proc, &_layout
            protected :_layout_from_proc
                          result = _layout_from_proc(#{_layout.arity == 0 ? '' : 'self'})              return #{default_behavior} if result.nil?              result
          when false
            nil
          when true
            raise ArgumentError, "Layouts must be specified as a String, Symbol, Proc, false, or nil"
          when nil
            name_clause
          end

        class_eval           def _layout(lookup_context, formats)            if _conditional_layout?              #{layout_definition}            else              #{name_clause}            end          end          private :_layout, __FILE__, __LINE__ + 1
      end