construct

# File activerecord/lib/active_record/associations.rb, line 1686
            def construct(parent, associations, joins, row)
              case associations
                when Symbol, String
                  while (join = joins.shift).reflection.name.to_s != associations.to_s
                    raise ConfigurationError, "Not Enough Associations" if joins.empty?
                  end
                  construct_association(parent, join, row)
                when Array
                  associations.each do |association|
                    construct(parent, association, joins, row)
                  end
                when Hash
                  associations.keys.sort{|a,b|a.to_s<=>b.to_s}.each do |name|
                    association = construct_association(parent, joins.shift, row)
                    construct(association, associations[name], joins, row) if association
                  end
                else
                  raise ConfigurationError, associations.inspect
              end
            end