Method: MongoDoc::Contexts::Mongo#grouped

Defined in:
lib/mongodoc/contexts/mongo.rb

#grouped(start, field, reduce) ⇒ Object

Common functionality for grouping operations. Currently used by min, max and sum. Will gsub the field name in the supplied reduce function.



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# File 'lib/mongodoc/contexts/mongo.rb', line 203

def grouped(start, field, reduce)
  result = collection.group(
    nil,
    selector,
    { start => "start" },
    reduce.gsub("[field]", field),
    true
  )
  result.empty? ? nil : result.first[start.to_s]
end