If you access data values incorrectly, you may get an error like so:<\/p>\n
\nObject field 'Title' may not be undefined\n<\/pre>\nHere is an example of what not to do:<\/p>\n
\nr.db('test')\n .table('salaries')\n .group('role', 'level')\n .sum('salary')\n .ungroup()\n .map( (x) => {\n return {\n Title: x('group')[0],\n Level: x('group')[1],\n Value: x('reduction')\n}})\n<\/pre>\nRemember that RethinkDB wants you to access everything through function calls, since it needs this for cross-language support. To fix this error, you access the arrays with function calls, like so:<\/p>\n
\n\nr.db('test')\n .table('salaries')\n .group('role', 'level')\n .sum('salary')\n .ungroup()\n .map( (x) => {\n return {\n Title: x('group')(0),\n Level: x('group')(1),\n Value: x('reduction')\n}})\n<\/pre>\n","protected":false},"excerpt":{"rendered":"If you access data values incorrectly, you may get an error like so: Object field ‘Title’ may not be undefined Here is an example of what not to do: r.db(‘test’) .table(‘salaries’) .group(‘role’, ‘level’) .sum(‘salary’) .ungroup() .map( (x) => { return { Title: x(‘group’)[0], Level: x(‘group’)[1], Value: x(‘reduction’) }}) Remember that RethinkDB wants you to access … <\/p>\n