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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?
Does anyone know how to change copyright in the templates for Xcode? That is, at the top of a new file it writes:
5 Answers...
What is the difference between origin and upstream on GitHub?
What is the difference between origin and upstream on GitHub ?
1 Answer
1
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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?
returns:
4 Answers
4
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What is the difference between os.path.basename() and os.path.dirname()?
What is the difference between os.path.basename() and os.path.dirname() ?
2 Answers
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Is there any way to view the currently mapped keys in Vim?
Basically, I'd like to view all of the keys maps made in the current buffer by all of plugins, vimrc, etc, in the current buffer. Is there anyway to do this?
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How do I convert a Vector of bytes (u8) to a string
I am trying to write simple TCP/IP client in Rust and I need to print out the buffer I got from the server.
3 Answers
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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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Xcode — what is $(SRCROOT)?
I am looking at an Xcode project that uses some libraries. The project was created on a different computer, so I need to update some paths. The library search paths all start with $(SRCROOT) . What does that mean?
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