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rails 3 validation on uniqueness on multiple attributes
I use Rails 3.0.0.beta4
3 Answers
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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
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How do I find which transaction is causing a “Waiting for table metadata lock” state?
I am trying to perform some DDL on a table and SHOW PROCESSLIST results in a " Waiting for table metadata lock " message.
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How to avoid scientific notation for large numbers in JavaScript?
JavaScript converts a large INT to scientific notation when the number becomes large. How can I prevent this from happening?
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Where does this come from: -*- coding: utf-8 -*-
Python recognizes the following as instruction which defines file's encoding:
4 Answers
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Create array of symbols
Is there a cleaner way to do something like this?
3 Answers
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What does -XX:MaxPermSize do?
Specifically, why would it help to fix a PermGen OutOfMemoryError issue?
3 Answers
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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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