CouchRest::Design.class_eval do # Calculate and update the checksum of the Design document. # Used for ensuring the latest version has been sent to the database. # # This will generate an flatterned, ordered array of all the elements of the # design document, convert to string then generate an MD5 Hash. This should # result in a consisitent Hash accross all platforms. # def checksum! # create a copy of basic elements base = self.dup base.delete('_id') base.delete('_rev') base.delete('couchrest-hash') result = nil flatten = lambda {|r| (recurse = lambda {|v| if v.is_a?(Hash) v.to_a.map{|v| recurse.call(v)}.flatten elsif v.is_a?(Array) v.flatten.map{|v| recurse.call(v)} else v.to_s end }).call(r) } self['couchrest-hash'] = Digest::MD5.hexdigest(flatten.call(base).sort.join('')) end end