hstore_to_string

# File activerecord/lib/active_record/connection_adapters/postgresql/cast.rb, line 38
        def hstore_to_string(object)
          if Hash === object
            object.map { |k,v|
              "#{escape_hstore(k)}=>#{escape_hstore(v)}"
            }.join ','
          else
            object
          end
        end