table.get(key) → singleRowSelection
Get a document by primary key.
If no document exists with that primary key, get will return null.
Example: Find a document by UUID.
r.table('posts').get('a9849eef-7176-4411-935b-79a6e3c56a74').run(conn, callback);
Example: Find a document and merge another document with it.
r.table('heroes').get(3).merge(
{ powers: ['invisibility', 'speed'] }
).run(conn, callback);
_Example: Subscribe to a document’s changefeed.
r.table('heroes').get(3).changes().run(conn, callback);
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https://rethinkdb.com/api/javascript/get/