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How to implement a unique index on two columns in rails
I have a table and I'm trying to add a unique index on two columns. Those columns are also indexed. So my question is if I just can remove the indexes who were just for one column or if I have to use all three indexes:
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How can I change the copyright template in Xcode 4?
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How can I filter a Django query with a list of values?
I'm sure this is a trivial operation, but I can't figure out how it's done.
3 Answers
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How can I see the current value of my $PATH variable on OS X?
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What is the difference between os.path.basename() and os.path.dirname()?
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What is “incremental linking”?
I've looked at Microsoft's MSDN and all around the web, but I still haven't been able to get a really good idea of what it is.
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How to get the last element of a slice?
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How to inspect the return value of a function in GDB?
Is it possible to inspect the return value of a function in gdb assuming the return value is not assigned to a variable?
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Change Screen Orientation programmatically using a Button
I think this is implementable since screen rotation behaviour can go up to the application level.
5 Answers
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