r.expr(value) → value
Construct a ReQL JSON object from a native object.
Example: Objects wrapped with expr can then be manipulated by ReQL API functions.
r.expr({:a => 'b'}).merge({:b => [1,2,3]}).run(conn)
Example: In Ruby, you can also do this with just r.
r.expr({:a => 'b'}).merge({:b => [1,2,3]}).run(conn)
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https://rethinkdb.com/api/ruby/expr/