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module Arel
module ClassExtensions
def attributes(*attrs)
@attributes = attrs
attr_reader *attrs
end
def deriving(*methods)
methods.each { |m| derive m }
end
def derive(method_name)
methods = {
:initialize => "
def #{method_name}(#{@attributes.join(',')})
#{@attributes.collect { |a| "@#{a} = #{a}" }.join("\n")}
end
",
:== => "
def ==(other)
#{name} === other &&
#{@attributes.collect { |a| "@#{a} == other.#{a}" }.join(" &&\n")}
end
"
}
class_eval methods[method_name], __FILE__, __LINE__
end
Class.send(:include, self)
end
end
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