thinking_sphinx.rb

# Have the Source use the main_search database if it exists.
module ThinkingSphinx
  class Source
    def set_source_database_settings(source)
      config = @database_configuration

      source.sql_host = config[:main_search]    || config[:host] || "localhost"
      source.sql_user = config[:username]       || config[:user] || 'root'
      source.sql_pass = (config[:password].to_s || "").gsub('#', '\#')
      source.sql_db   = config[:database]
      source.sql_port = config[:port]
      source.sql_sock = config[:socket]
    end
  end
end

For Thinking Sphinx 1.4.4