class ActiveRecord::Associations::JoinDependency

def join_constraints(joins_to_add, alias_tracker, references)
  @alias_tracker = alias_tracker
  @joined_tables = {}
  @references = {}
  references.each do |table_name|
    @references[table_name.to_sym] = table_name if table_name.is_a?(Arel::Nodes::SqlLiteral)
  end unless references.empty?
  joins = make_join_constraints(join_root, join_type)
  joins.concat joins_to_add.flat_map { |oj|
    if join_root.match? oj.join_root
      walk(join_root, oj.join_root, oj.join_type)
    else
      make_join_constraints(oj.join_root, oj.join_type)
    end
  }
end