lib/mongoid/matchable/exists.rb
# encoding: utf-8
module Mongoid
module Matchable
# Checks for existance.
class Exists < Default
# Return true if the attribute exists and checking for existence or
# return true if the attribute does not exist and checking for
# non-existence.
#
# @example Does anything exist?
# matcher.matches?({ :key => 10 })
#
# @param [ Hash ] value The values to check.
#
# @return [ true, false ] If a value exists.
def matches?(value)
@attribute.nil? != value.values.first
end
end
end
end