Method: Mongoid::Collection#map_reduce

Defined in:

lib/mongoid/collection.rb

#map_reduce(map, reduce, options = {}) ⇒ Cursor Also known as: mapreduce

Perform a map/reduce on the documents.

Examples:

Perform the map/reduce.

collection.map_reduce(map, reduce)

Parameters:

• map (String) —

  The map javascript function.

• reduce (String) —

  The reduce javascript function.

• options (Hash) (defaults to: {}) —

  The options to pass to the db.

Returns:

• (Cursor) —

  The results.

# File 'lib/mongoid/collection.rb', line 112

def map_reduce(map, reduce, options = {})
  master(options).map_reduce(map, reduce, options)
end