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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:
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What is the difference between origin and upstream on GitHub?
What is the difference between origin and upstream on GitHub ?
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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()?
What is the difference between os.path.basename() and os.path.dirname() ?
2 Answers
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Objective-C class -> string like: [NSArray className] -> @“NSArray”
I am trying to get a string name of a class from the class object itself.
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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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getMonth in javascript gives previous month
I am using a datepicker which gives a date in the format Sun Jul 7 00:00:00 EDT 2013.
Even though the month says July, if I do a getMonth, it gives me the previous month.
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