rails中使用UUID
可以将uuid的包拷贝到vendor/plugins下，或者在Gemfile里加上
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gem 'uuidtools'
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示例：
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require "uuidtools"UUIDTools::UUID.md5_create(UUIDTools::UUID_DNS_NAMESPACE, "2015.iteye.com")# a8d2b2e9-c6ce-3d87-b44a-a5edb8ce907eUUIDTools::UUID.sha1_create(UUIDTools::UUID_DNS_NAMESPACE, "2015.iteye.com")# cb0ebd98-8dd8-5db7-a817-6725c0725401UUIDTools::UUID.timestamp_create# 81d96c20-f220-11e0-bee8-005056c00001UUIDTools::UUID.random_create# 48420262-8a94-41f2-8df0-9396ee9aacfc
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官方地址：http://uuidtools.rubyforge.org/
