value.to_json_string() → string
Convert a ReQL value or object to a JSON string.
Example: Get a ReQL document as a JSON string.
> r.table('hero').get(1).to_json_string()
'{"id": 1, "name": "Batman", "city": "Gotham", "powers": ["martial arts", "cinematic entrances"]}'
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https://rethinkdb.com/api/ruby/to_json_string/