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rails 3 validation on uniqueness on multiple attributes

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MySQL Select all columns from one table and some from another table

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What does git push -u mean?

I have two different versions of git. In the 1.6.2 version, git push does not have the -u option. It only appears in the 1.7.x version. ...
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How do you move a commit to the staging area in git?

If you want to move a commit to the staging area - that is uncommit it and move all of the changes which were in it into the staging area (effectively putting the branch in the state that it would have been in prior to the commit) - how do you do it? Or is it something that you can't do? ...
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MongoDB: How to query for records where field is null or not set?

I have an Email document which has a sent_at date field: 6 Answers 6 ...
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Where does this come from: -*- coding: utf-8 -*-

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Create array of symbols

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What does -XX:MaxPermSize do?

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Get TransactionScope to work with async / await

I'm trying to integrate async / await into our service bus. I implemented a SingleThreadSynchronizationContext based on this example http://blogs.msdn.com/b/pfxteam/archive/2012/01/20/10259049.aspx . ...
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How does OpenID authentication work?

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