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How do I add indices to MySQL tables?
...d_index` (`product_id`)
Never compare integer to strings in MySQL. If id is int, remove the quotes.
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What's the difference between the build and create methods in FactoryGirl?
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The create() method persists the instance of the model while the build() method keeps it only on memory.
Personally, I use the create() method only when persistence is really necessary since writing to DB makes testing time consuming.
e.g.
I cre...
How can I initialize base class member variables in derived class constructor?
Why can't I do this?
8 Answers
8
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Fast way to get image dimensions (not filesize)
..., including JPEG, TIFF, PNG, GIF, WEBP, even if no EXIF header present. It is unclear if it reads the whole data for that though. See the manpage of exiv2 for all supported image formats.
head -n1 will give you the dimensions for PPM, PGM formats.
For formats popular on the web, both exiv2 and ide...
How to inspect the return value of a function in GDB?
Is it possible to inspect the return value of a function in gdb assuming the return value is not assigned to a variable?
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JavaScript: Overriding alert()
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It's definitely "supported". It is your web page, you do whatever you want to with it.
I already did this to track analytics events without modifying a library but by sneaking into events.
Use the proxy pattern:
(function(proxied) {
window.alert = func...
How to align an image dead center with bootstrap
...v3.0.3 has a class: center-block
Center content blocks
Set an element to display: block and center via margin. Available as a mixin and class.
Just need to add a class .center-block in the img tag, looks like this
<div class="container">
<div class="row">
<div class="span4">...
How to make the tab character 4 spaces instead of 8 spaces in nano?
...en I press TAB in nano editor, the cursor will jump with 8 spaces like this:
6 Answers
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Replacement for deprecated sizeWithFont: in iOS 7?
In iOS 7, sizeWithFont: is now deprecated. How do I now pass in the UIFont object into the replacement method sizeWithAttributes: ?
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How to clear the cache of nginx?
...use nginx to as the front server, I have modified the CSS files, but nginx is still serving the old ones.
22 Answers
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