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From: https://stackoverflow.com/questions/27482840/ruby-finding-duplicates-in-mongodb/27488317
results = JobNumber.collection.aggregate([
{ "$group" => {
_id: { "number" => "$number"},
recordIds: {"$addToSet" => "$_id" },
count: { "$sum" => 1 }
}},
{ "$match" => {
count: { "$gt" => 1 }
}}
])