# File lib/sawyer/relation.rb, line 70
    def self.from_links(agent, index, rels = Map.new)
      if index.is_a?(Array)
        raise ArgumentError, "Links must be a hash of rel => {_href => '...'}: #{index.inspect}"
      end

      index.each do |name, options|
        rels << from_link(agent, name, options)
      end if index

      rels
    end