class AttrExtras::AttrImplement
Public Class Methods
new(klass, names)
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# File lib/attr_extras/attr_implement.rb, line 2 def initialize(klass, names) @klass, @names = klass, names.dup end
Public Instance Methods
apply()
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Calls superclass method
# File lib/attr_extras/attr_implement.rb, line 6 def apply arg_names = @names.last.is_a?(Array) ? @names.pop : [] expected_arity = arg_names.length # Make available within the block. names = @names mod = Module.new do define_method :method_missing do |name, *args| if names.include?(name) provided_arity = args.length if provided_arity != expected_arity raise ArgumentError, "wrong number of arguments (#{provided_arity} for #{expected_arity})" end raise AttrExtras::MethodNotImplementedError, "Implement a#{"n" if name[0].match?(/\A[aeiou]/i)} '#{name}(#{arg_names.join(", ")})' method" else super(name, *args) end end end # include is private in Ruby 2.0 and earlier. @klass.send(:include, mod) end