couchrest_model/lib/couchrest/model/support/couchrest_design.rb

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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