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How to install a gem or update RubyGems if it fails with a permissions error
... don't have write permissions into the /Library/Ruby/Gems/1.8 directory.
means exactly that, you don't have permission to write there.
That is the version of Ruby installed by Apple, for their own use. While it's OK to make minor modifications to that if you know what you're doing, because you ar...
MongoDB or CouchDB - fit for production? [closed]
I was wondering if anyone can tell me if MongoDB or CouchDB are ready for a production environment.
19 Answers
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How to implement WiX installer upgrade?
...ewest versions (from the 3.5.1315.0 beta), you can use the MajorUpgrade element instead of 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 l...
Best way to test if a generic type is a string? (C#)
...ht I tried that solution earlier and it did not work, but I must've done something stupid. And thanks for pointing out default(string) returns null, we did not run into an error yet because of it, but that is true.
– Rex M
May 29 '10 at 0:32
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How to get certain commit from GitHub project
...u only want to use this SDK, rather than actively develop it, this isn't something you need to worry about, unless you're interested in finding out more about how git works.
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Why shouldn't Java enum literals be able to have generic type parameters?
... given in the JEP is, which is precisely what I was looking for:
enum Argument<X> { // declares generic enum
STRING<String>(String.class),
INTEGER<Integer>(Integer.class), ... ;
Class<X> clazz;
Argument(Class<X> clazz) { this.clazz = clazz; }
Class&l...
Multiple submit buttons on HTML form – designate one button as default [duplicate]
...ing floats. For example:
<p id="buttons">
<input type="submit" name="next" value="Next">
<input type="submit" name="prev" value="Previous">
</p>
with:
#buttons { overflow: hidden; }
#buttons input { float: right; }
will effectively reverse the order and thus the "Next" ...
How can I calculate an md5 checksum of a directory?
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find /path/to/dir/ -type f -name "*.py" -exec md5sum {} + | awk '{print $1}' | sort | md5sum
The find command lists all the files that end in .py.
The md5sum is computed for each .py file. awk is used to pick off the md5sums (ignoring the filenames, whi...
Pandas read_csv low_memory and dtype options
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The deprecated low_memory option
The low_memory option is not properly deprecated, but it should be, since it does not actually do anything differently[source]
The reason you get this low_memory warning is because guessing dtypes for each colum...
A better similarity ranking algorithm for variable length strings
...f it (taken from the plain ruby version done in the related forum entry comment by Mark Wong-VanHaren) so that I can use it in my PostgreSQL queries:
CREATE FUNCTION string_similarity(str1 varchar, str2 varchar)
RETURNS float8 AS '
str1.downcase!
pairs1 = (0..str1.length-2).collect {|i| str1[i,2]...