blocks|key|1506390|text|How+to+create+small,+unique+tokens+in+Ruby|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1506391|>>+require+'digest'
=>+[]
>>+Digest::SHA1.hexdigest("some-random-string")[8..16]
=>+"2ebe5597f"

>>+SecureRandom.base64(8).gsub("/","_").gsub(/=%2B$/,"")
=>+"AEWQyovNFo0"+

>>+rand(36**8).to_s(36)
=>+"uur0cj2h"|code-block|syntax|javascript|1506392|entityMap|0|LINK|mutability|MUTABLE|url|http://web.archive.org/web/20120925034700/http://blog.logeek.fr/2009/7/2/creating-small-unique-tokens-in-ruby^0|0|16|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<a href="http://web.archive.org/web/20120925034700/http://blog.logeek.fr/2009/7/2/creating-small-unique-tokens-in-ruby" rel="nofollow noreferrer">How to create small, unique tokens in Ruby</a>

<pre><code>&gt;&gt; require 'digest'
=&gt; []
&gt;&gt; Digest::SHA1.hexdigest("some-random-string")[8..16]
=&gt; "2ebe5597f"

&gt;&gt; SecureRandom.base64(8).gsub("/","_").gsub(/=+$/,"")
=&gt; "AEWQyovNFo0" 

&gt;&gt; rand(36**8).to_s(36)
=&gt; "uur0cj2h"
</code></pre>

blocks|key|1291821|text|从Ruby+1.9开始，uuid生成是内置的。使用SecureRandom.uuid函数。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1291822|例如：|1291823|require+'securerandom'
SecureRandom.uuid+#+=>+"96b0a57c-d9ae-453f-b56f-3b154eb10cda"|code-block|syntax|javascript|1291824|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ruby-doc.org/stdlib-1.9.3/libdoc/securerandom/rdoc/SecureRandom.html#method-c-uuid^0|P|H|P|H|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|11|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

As of Ruby 1.9, uuid generation is built-in. Use the <a href="http://www.ruby-doc.org/stdlib-1.9.3/libdoc/securerandom/rdoc/SecureRandom.html#method-c-uuid" rel="noreferrer"><code>SecureRandom.uuid</code></a> function.

For example:

<pre><code>require 'securerandom'
SecureRandom.uuid # =&gt; "96b0a57c-d9ae-453f-b56f-3b154eb10cda"
</code></pre>

blocks|key|1291856|text|在深夜编程时，我想出了以下解决方案(基于Simone的解决方案)，用于在Rails中生成唯一的GUID。我并不以此为荣，但它确实工作得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1291857|while+Order.find_by_guid(guid+=+rand(36**8).to_s(36).upcase).present?;+end|code-block|syntax|javascript|1291858|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

While programming late at night I came up with the following solution (based off Simone's) for generating a unique GUID in Rails. I am not proud of it but it does work quite well.

<pre><code>while Order.find_by_guid(guid = rand(36**8).to_s(36).upcase).present?; end
</code></pre>

blocks|key|1506569|text|创建正确的mysql+varchar+32+GUID|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1506570|SecureRandom.uuid.gsub('-','').upcase|code-block|syntax|javascript|1506571|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To create a proper, mysql, varchar 32 GUID

<pre><code>SecureRandom.uuid.gsub('-','').upcase
</code></pre>

blocks|key|1506612|text|这是我从JavaScript学到的neet技术：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1506613|def+uuid
++++"xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx".gsub("x")+do
++++++++"0123456789ABCDEF"[rand(16)]
++++end
end|code-block|syntax|javascript|1506614|尽管以更“红宝石的方式”，人们也可以这样做：|1506615|def+uuid
++++"xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx".gsub("x")+do
++++++++rand(16).to_s(16)
++++end
end|1506616|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

This is a neet technique I learnt from JavaScript:
<pre><code>def uuid
 &quot;xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx&quot;.gsub(&quot;x&quot;) do
 &quot;0123456789ABCDEF&quot;[rand(16)]
 end
end
</code></pre>
Although in a more 'ruby way' one could also do:
<pre><code>def uuid
 &quot;xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx&quot;.gsub(&quot;x&quot;) do
 rand(16).to_s(16)
 end
end
</code></pre>

I have a problem that is really easily solved with GUIDs.
In particular, for a password reset workflow, I would like to send a GUID token to a user's email and have them reset their password using the token. Since GUIDs are unique, this is pretty secure and saves me emailing people passwords, which is risky.
I noticed there is one <a href="http://rubyforge.org/projects/uuid" rel="noreferrer">uuid gem @ rubyforge</a> but it looks quite old, and it writes stuff to the file system.
Does anyone know of any other gems that can create a globally unique identifier?
I know I can just fall back to:
<pre class="lang-ruby prettyprint-override"><code>(0..16).to_a.map{ |a| rand(16).to_s(16) }.join 
</code></pre>
But it does not really seem like a proper GUID ...

Generating GUIDs in Ruby

文件系统

我有一个用GUID就能很容易解决的问题。特别是，对于密码重置工作流，我希望向用户的电子邮件发送一个GUID令牌，并让他们使用该令牌重置其密码。因为GUID是唯一的，所以这是非常安全的，并且省去了我给人发电子邮件密码的麻烦。我注意到有一个，但它看起来很旧，它将内容写入文件系统。有没有人知道其他可以创建全局唯一标识符的ge...

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