If you run a ‘map’ in RethinkDB and an attribute is not found, you can get an error like so:<\/p>\n
\nr.db('test')\n .table('users')\n .map(\n (doc) => {\n return {\n first_name: doc('first_name'),\n last_name: doc('last_name')\n }\n }\n)\n<\/pre>\n\ne: No attribute `last_name` in object:\n<\/pre>\nThere are a couple ways to fix this, depending on your needs.<\/p>\n
You can remove objects without these attributes:<\/p>\n
\nr.db('test').table('users')\n .withFields(['first_name', 'last_name'])\n .map(\n (doc) => {\n return {\n first_name: doc('first_name'),\n last_name: doc('last_name')\n }\n }\n )\n<\/pre>\nYou can also fix this by setting default attributes with the ‘merge’ function (this is similar to coalesce in SQL):<\/p>\n
\nr.db('test').table('users')\n .map(\n (doc) => { return r.expr(\n {\n first_name: '',\n last_name: ''\n }\n ).merge(doc) }\n )\n<\/pre>\n","protected":false},"excerpt":{"rendered":"If you run a ‘map’ in RethinkDB and an attribute is not found, you can get an error like so: r.db(‘test’) .table(‘users’) .map( (doc) => { return { first_name: doc(‘first_name’), last_name: doc(‘last_name’) } } ) e: No attribute `last_name` in object: There are a couple ways to fix this, depending on your needs. You can … <\/p>\n