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Contents
module MongoDoc
module Index
DIRECTION = { :asc => Mongo::ASCENDING,
:desc => Mongo::DESCENDING,
:geo2d => Mongo::GEO2D }
OPTIONS = [:min, :max, :background, :unique, :dropDups]
# Create an index on a collection.
#
# For compound indexes, pass pairs of fields and
# directions (+:asc+, +:desc+) as a hash.
#
# For a unique index, pass the option +:unique => true+.
# To create the index in the background, pass the options +:background => true+.
# If you want to remove duplicates from existing records when creating the
# unique index, pass the option +:dropDups => true+
#
# For GeoIndexing, specify the minimum and maximum longitude and latitude
# values with the +:min+ and +:max+ options.
#
# <tt>Person.index(:last_name)</tt>
# <tt>Person.index(:ssn, :unique => true)</tt>
# <tt>Person.index(:first_name => :asc, :last_name => :asc)</tt>
# <tt>Person.index(:first_name => :asc, :last_name => :asc, :unique => true)</tt>
def index(*args)
options_and_fields = args.extract_options!
if args.any?
collection.create_index(args.first, options_and_fields)
else
fields = options_and_fields.except(*OPTIONS)
options = options_and_fields.slice(*OPTIONS)
collection.create_index(to_mongo_direction(fields), options)
end
end
protected
def to_mongo_direction(fields_hash)
fields_hash.to_a.map {|field| [field.first, direction(field.last)]}
end
def direction(dir)
DIRECTION[dir] || Mongo::ASCENDING
end
end
end
Version data entries
34 entries across 34 versions & 2 rubygems