Sha256: 919a692dda23ffac533dc2452da51c4b751991846b20aa372ddfd968d465b17f
Contents?: true
Size: 891 Bytes
Versions: 16
Compression:
Stored size: 891 Bytes
Contents
require 'set'
module ActiveSupport #:nodoc:
module CoreExtensions #:nodoc:
module Hash #:nodoc:
# Slice a hash to include only the given keys. This is useful for
# limiting an options hash to valid keys before passing to a method:
#
# def search(criteria = {})
# assert_valid_keys(:mass, :velocity, :time)
# end
#
# search(options.slice(:mass, :velocity, :time))
module Slice
# Returns a new hash with only the given keys.
def slice(*keys)
allowed = Set.new(respond_to?(:convert_key) ? keys.map { |key| convert_key(key) } : keys)
hash = {}
allowed.each { |k| hash[k] = self[k] if has_key?(k) }
hash
end
# Replaces the hash with only the given keys.
def slice!(*keys)
replace(slice(*keys))
end
end
end
end
end
Version data entries
16 entries across 16 versions & 4 rubygems