singleSelection.keys() → array object.keys() → array
Return an array containing all of an object’s keys. Note that the keys will be sorted as described in ReQL data types (for strings, lexicographically).
Example: Get all the keys from a table row.
# row: { :id => 1, :mail => "[email protected]", :name => "fred" }
r.table('users').get(1).keys().run(conn)
> [ "id", "mail", "name" ]
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    https://rethinkdb.com/api/ruby/keys/