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Ruby on Rails: getting the max value from a DB column
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Assuming your model name is Bar and it has a column named bar, this should work:
Bar.maximum("bar")
See the excellent Rails Guides section on Calculations for more info.
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Get all keys of an NSDictionary as an NSArray
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And if you want to get all keys and values, here's what you do:
for (NSString *key in dictionary) {
id value = dictionary[key];
NSLog(@"Value: %@ for key: %@", value, key);
}
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Cost of storing AMI
I understand Amazon will charge per GB provisioned EBS storage. If I create AMI of my instance, does this mean my EBS volume will be duplicated, and hence incur additional cost?
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Undoing a git bisect mistake
I'm doing a non-automated git bisect via command line. All is going well until I accidentally hit return on the wrong line in my command history, and rather than running the test, I run 'git bisect good' (or bad). Oops - I don't yet know if this commit should be marked good or bad, yet that's what I...
How to see all TODO tasks in Android Studio?
How could I open a view in Android Studio where all tasks that I've created using // TODO comments would be displayed?
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Visual Studio 2013 git, only Master branch listed
...rge tool) is master. Other branches show up in GitHub, GitHub for Windows, and TortoiseGit. So I know they're there and I have access.
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How to go back to lines edited before the last one in Vim?
I'm aware of the `. command that goes to last edited line. Is there a way to go further in the editing history? I often accidentally insert something while browsing the file, undo, but then `. will not bring me where I want anymore.
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Why does “while(true)” without “Thread.sleep” cause 100% CPU usage on Linux but not on Windows?
...s say you have 4 cores:
With IRIX mode on, 1 fully utilized core is 100% and 4 cores are 400%.
With IRIX mode off, 1 fully utilized core is 25% and 4 cores are 100%.
This means that by default, top on Linux will show an infinite loop as ~100% and Windows will show it as ~25%, and it means exac...
Difference between CLOB and BLOB from DB2 and Oracle Perspective?
...enter/db2luw/v10r5/topic/com.ibm.db2.luw.sql.ref.doc/doc/r0008473.html
SQL and XML limits: http://pic.dhe.ibm.com/infocenter/db2luw/v10r5/topic/com.ibm.db2.luw.sql.ref.doc/doc/r0001029.html
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connect local repo with remote repo
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The easiest way to find out is to try it and see. Git will let you know if it's not right.
– vergenzt
Jun 25 '12 at 11:57
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