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How to fix the uninitialized constant Rake::DSL problem on Heroku?
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Thank you. That fixed my problems and I didn't know what was going on. (Using the rails installer on windows and deploying to heroku, as a complete beginner.)
– Jack V.
Jun 14 '11 at 22:46
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What is the list of possible values for navigator.platform as of today? [closed]
...s case, all the major browsers (IE, Safari, Firefox and Chrome) agree that my 64-bit Windows machine is a `Win32` platform. This means they're sticking to the old definition as far as Windows goes, because none of them are compiled for 64-bit thus far. Look on the bright side though: at least they a...
Create singleton using GCD's dispatch_once in Objective-C
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@Dave DeLong: In my opinion purpose of having singleton is not a certainty of its immortality, but certainty that we have one instance. What if that singleton decrement a semaphore? You can't just arbitrary say that it will always exists.
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What is the proper way to check for null values?
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This was the most direct answer to my question so I'm marking the answer, but Jon Skeet's extension method .ToStringOrDefault() is my preferred way of doing it. However, I am using this answer within Jon's extension method ;)
– Chev
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How can I use threading in Python?
...below - it ends up being just a few lines of code:
from multiprocessing.dummy import Pool as ThreadPool
pool = ThreadPool(4)
results = pool.map(my_function, my_array)
Which is the multithreaded version of:
results = []
for item in my_array:
results.append(my_function(item))
Description
Map i...
The difference between sys.stdout.write and print?
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My question is whether or not there
are situations in which
sys.stdout.write() is preferable to
print
After finishing developing a script the other day, I uploaded it to a unix server. All my debug messages used print...
Hidden features of mod_rewrite
...):
# logs can't be enabled from .htaccess
# loglevel > 2 is really spammy!
RewriteLog /path/to/rewrite.log
RewriteLogLevel 2
Common use cases
To funnel all requests to a single point:
RewriteEngine on
# ignore existing files
RewriteCond %{REQUEST_FILENAME} !-f
# ignore existing directori...
Physical vs. logical / soft delete of database record?
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When deciding to use logical, physical deletes, or archiving I would ask myself these questions:
Is this data that might need to be re-inserted into the table. For example User Accounts fit this category as you might activate or deactivate a user account. If this is the case a logical delete mak...
What is @ModelAttribute in Spring MVC?
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I know this is an old thread, but I thought I throw my hat in the ring and see if I can muddy the water a little bit more :)
I found my initial struggle to understand @ModelAttribute was a result of Spring's decision to combine several annotations into one. It became clearer ...
Create an empty object in JavaScript with {} or new Object()?
...h), and allows you to instantly populate the object inline - like so:
var myObject = {
title: 'Frog',
url: '/img/picture.jpg',
width: 300,
height: 200
};
Arrays
For arrays, there's similarly almost no benefit to ever using new Array(); over []; - with o...