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Rails migrations: self.up and self.down versus change
...end
But:
You had to avoid using change method which allows to save some time. For example, if you didn’t need to update column value immediately after it’s adding you would cut this code down to like this:
def change
add_column :users, :location, :string
end
On up it will add column to t...
Where is the list of predefined Maven properties
...tory>/my/path</sourceDirectory>
Also helpful - you can do a real time evaluation of properties via the command line execution of mvn help:evaluate while in the same dir as the POM.
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Chrome DevTools Devices does not detect device when plugged in
...ere had to be a faster way as the Android SDK was over 1GB download.
This time I tried:
Follow steps at https://developers.google.com/chrome-developer-tools/docs/remote-debugging
Install Windows USB driver http://developer.samsung.com/android/tools-sdks/Samsung-Andorid-USB-Driver-for-Windows (the...
Interface or an Abstract Class: which one to use?
...s, that means each child class may only conform to a single contract. Sometimes this a good thing, when you want to force your user-programmers along a particular path. Other times it would be bad. Imagine if PHP's Countable and Iterator interfaces were abstract classes instead of interfaces.
On...
Generate unique random numbers between 1 and 100
... {e.g. [1,2,3...100]} and we stop swapping after 8 swaps;
then most of the times array will look like {1,2,3,76,5,6,7,8,...numbers here will be shuffled ...10}.
Because every number will be swapped with probability 1/100 so
prob. of swapping first 8 numbers is 8/100 whereas prob. of swapping other...
What is the difference between application server and web server?
...
Most of the times these terms Web Server and Application server are used interchangeably.
Following are some of the key differences in features of Web Server and Application Server:
Web Server is designed to serve HTTP Content. App Se...
Git Tag list, display commit sha1 hashes
...other alias (which is a bummer).
If you want to see the commit date and time, try:
git log --tags --no-walk --date=iso-local --pretty='%C(auto)%h %cd%d %s'
You can use other date formats in the --date option as well as fully control the output to match your unique taste in the --pretty option....
Why does CSS not support negative padding?
I have seen this many a times that the prospect of a negative padding might help the development of CSS of certain page elements become better and easier. Yet, there is no provision for a negative padding in the W3C CSS. What is the reason behind this? Is there any obstruction to the property that p...
What is the meaning of the term arena in relation to memory?
...mending the last paragraph. You really don't need any evidence at all. Any time you know how you're going to use memory, you know more than a "good" general-purpose allocator, and if you use this knowledge your custom allocator will always win. Allocators are not magic. An arena is useful if you hav...
How can I create a temp file with a specific extension with .NET?
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@Pax: you have more chnace of winning the lottery 1000 times in a row than generating two idebtical guids. That's unique enough I guess...
– Mitch Wheat
Feb 24 '09 at 12:41
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