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Create PostgreSQL ROLE (user) if it doesn't exist
How do I write an SQL script to create a ROLE in PostgreSQL 9.1, but without raising an error if it already exists?
10 Answ...
Removing multiple keys from a dictionary safely
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edited Jan 16 '18 at 8:22
answered Jan 24 '12 at 23:20
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What's the absurd function in Data.Void useful for?
...ta.Void has the following signature, where Void is the logically uninhabited type exported by that package:
6 Answers
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Amazon products API - Looking for basic overview and information
After using the ebay API recently, I was expecting it to be as simple to request info from Amazon, but it seems not...
6 An...
How to change the background color of a UIButton while it's highlighted?
...dSet {
backgroundColor = isHighlighted ? UIColor.black : UIColor.white
}
}
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How does the Amazon Recommendation feature work?
...mendation is currently the best in the market, but how do they provide us with such relevant recommendations?
8 Answers
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Rails 2.3-style plugins and deprecation warnings running task in Heroku
...tly as 2013-08, heroku always injected plugins in rails 3 apps, even apps with the recommended gems. This was an issue with the ruby buildpack, and was fixed by PR 11, merged on 2013-08-06.
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Any reason not to start using the HTML 5 doctype? [closed]
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When serving as text/html, whether you use XHTML markup or HTML markup, it's treated by browsers as HTML.
So, really it comes down to using the shortest doctype that triggers standards mode (<!DOCTYPE html>) and using HTML markup that produces the correct result in browsers.
The rest is a...
How to implement WiX installer upgrade?
...f using your own.
For example, we use this code to do automatic upgrades. It prevents downgrades, giving a localised error message, and also prevents upgrading an already existing identical version (i.e. only lower versions are upgraded):
<MajorUpgrade
AllowDowngrades="no" DowngradeErrorMes...
PATH issue with pytest 'ImportError: No module named YadaYadaYada'
I used easy_install to install pytest on a mac and started writing tests for a project with a file structure likes so:
20 A...