Driver function won't run

[measwel]

As per documentation, models.driver should point to the cassandra driver instance, so one should be able to run driver functions. I am trying to execute a query with the driver:

models.driver.execute(q, function (err, result) {

But this throws: "stacktrace": "TypeError: models.driver.execute is not a function

The models.driver properties are:
[ 'Client',
'ExecutionProfile',
'types',
'errors',
'policies',
'auth',
'token',
'metadata',
'Encoder',
'defaultOptions',
'version',
'ClientAsync',
'ExecutionProfileAsync',
'EncoderAsync',
'defaultOptionsAsync' ]