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How to rollback a specific migration?
I have the following migration file db\migrate\20100905201547_create_blocks.rb
14 Answers
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How to rename with prefix/suffix?
How do I do mv original.filename new.original.filename without retyping the original filename?
9 Answers
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What is the LD_PRELOAD trick?
...oss a reference to it recently on proggit and (as of now) it is not explained.
9 Answers
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java.lang.IllegalStateException: The specified child already has a parent
I am using fragments, when I instantiate a fragment the first time it it. but the second time I got this exception. I couldn't find the line where I got the error?
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Wait for a process to finish
Is there any builtin feature in Bash to wait for a process to finish?
14 Answers
14
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Xml Namespace breaking my xpath! [duplicate]
I have the following XML:
5 Answers
5
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What is the equivalent of “none” in django templates?
I want to see if a field/variable is none within a Django template. What is the correct syntax for that?
7 Answers
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Change select box option background color
I have a select box and I'm trying to change the background color of the options when the select box has been clicked and shows all the options.
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java.lang.RuntimeException: Unable to instantiate activity ComponentInfo
I was trying to run a sample code
While launching the application in the android 1.5 emulator , I got these errors....
Any one have some hint..?
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Selectors in Objective-C?
..., I'm not sure I really understand what a selector is. From my understanding, it's the name of a method, and you can assign it to a class of type 'SEL' and then run methods such as respondToSelector to see if the receiver implements that method. Can someone offer up a better explanation?
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