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module StateMachine
# Provides a set of helper methods for making assertions about the content
# of various objects
module Assertions
# Validates that the given hash *only* includes the specified valid keys.
# If any invalid keys are found, an ArgumentError will be raised.
#
# == Examples
#
# options = {:name => 'John Smith', :age => 30}
#
# assert_valid_keys(options, :name) # => ArgumentError: Invalid key(s): age
# assert_valid_keys(options, 'name', 'age') # => ArgumentError: Invalid key(s): age, name
# assert_valid_keys(options, :name, :age) # => nil
def assert_valid_keys(hash, *valid_keys)
invalid_keys = hash.keys - valid_keys
raise ArgumentError, "Invalid key(s): #{invalid_keys.join(', ')}" unless invalid_keys.empty?
end
# Validates that the given hash only includes at *most* one of a set of
# exclusive keys. If more than one key is found, an ArgumentError will be
# raised.
#
# == Examples
#
# options = {:only => :on, :except => :off}
# assert_exclusive_keys(options, :only) # => nil
# assert_exclusive_keys(options, :except) # => nil
# assert_exclusive_keys(options, :only, :except) # => ArgumentError: Conflicting keys: only, except
# assert_exclusive_keys(options, :only, :except, :with) # => ArgumentError: Conflicting keys: only, except
def assert_exclusive_keys(hash, *exclusive_keys)
conflicting_keys = exclusive_keys & hash.keys
raise ArgumentError, "Conflicting keys: #{conflicting_keys.join(', ')}" unless conflicting_keys.length <= 1
end
end
end
Version data entries
58 entries across 58 versions & 15 rubygems