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When to add what indexes in a table in Rails
...x (:users, [:category_id, :state_id]), what happens? How is this different from adding the index for each key?
Then the index is a combined index of the two columns. That doesn't make any sense, unless you want all entries for one category_id AND one state_id (It should be category_id not categor...
history.replaceState() example?
...ll change the title using onpopstate event, and passing the title name not from the second argument, but as an attribute from the first parameter passed as object
Reference:
http://spoiledmilk.com/blog/html5-changing-the-browser-url-without-refreshing-page/
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How to empty (“truncate”) a file on linux that already exists and is protected in someway?
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You have the noclobber option set. The error looks like it's from csh, so you would do:
cat /dev/null >! file
If I'm wrong and you are using bash, you should do:
cat /dev/null >| file
in bash, you can also shorten that to:
>| file
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What does the brk() system call do?
...sh immediately.
I'm not sure where the number 512GB in this diagram comes from. It implies a 64-bit virtual address space, which is inconsistent with the very simple memory map you have there. A real 64-bit address space looks more like this:
Legend: t: text, d: data, b: BSS
T...
Utilizing the GPU with c# [closed]
...ad/Cloo) - many of these are just bindings - ie enable you to call the GPU from C#, but your kernel code (code which is actually run on the GPU) needs to be written in C or OpenCL, meaning you must use (and learn) another language.
As I said, I would recommend Cudafy over all the others - if it co...
Can I get chrome-devtools to actually search all JS sources?
...e internal browser API, you enable it in the Settings of DevTools and then from any panel in DevTools you can type Ctrl + Shift + F or (on Mac) Options + Command + F (⌥⌘F) to search across all sources, snippets, and files.
Even more helpful to what you may be needing is to set up a Workspace in...
How to develop and test an app that sends emails (without filling someone's mailbox with test data)?
...es for me every time a mail is received (running smtp4dev on win7, sending from SQL Server Database Mail Test E-mail script)
– Jona
Dec 6 '11 at 13:17
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Get current URL of UIWebView
...uld try this:
NSString *currentURL = [webView stringByEvaluatingJavaScriptFromString:@"window.location"];
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How to make git diff --ignore-space-change the default
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I was thinking that from reading that page too. I was hoping someone knew a way that just wasn't documented.... oh well.
– boatcoder
Sep 6 '11 at 0:18
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AngularJS 1.2 $injector:modulerr
...d it provides .map files - I wonder why Chrome was still showing me errors from the minified file. Thanks for the heads up, @Mart!
– Aditya M P
Sep 8 '13 at 21:02
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