Using NOT with Squeel

Say I have a set of conditions: ``` Person.where{(name =~ 'Ernie%') & (salary < 50000) | (name =~ 'Joe%') & (salary > 100000)} ``` ...which will generate SQL as follows: ``` SELECT "people".* FROM people WHERE ("people"."name" LIKE 'Ernie%' AND "people"."salary" < 50000) OR ("people"."name" LIKE 'Joe%' AND "people"."salary" > 100000) ``` How do I go about inverting the returned set, i.e. updating the Squeel to return the following sql: ``` SELECT "people".* FROM people WHERE NOT(("people"."name" LIKE 'Ernie%' AND "people"."salary" < 50000) OR ("people"."name" LIKE 'Joe%' AND "people"."salary" > 100000)) ``` This is a little contrived, as my issue also involves a dynamically generated set of conditions - I can't change the actual conditions, but just need them wrapping in a NOT(). Anyone any ideas or suggestions on where to look?