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Add a reference column migration in Rails 4
...elf and ensure that database would reject any operation that violates this set referential integrity. As @infoget commented, Rails 4.2 ships with native support for foreign keys(referential integrity). It's not required but you might want to add foreign key(as it's very useful) to the reference that...
Python subprocess/Popen with a modified environment
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To temporarily set an environment variable without having to copy the os.envrion object etc, I do this:
process = subprocess.Popen(['env', 'RSYNC_PASSWORD=foobar', 'rsync', \
'rsync://username@foobar.com::'], stdout=subprocess.PIPE)
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How do you display a Toast from a background thread on Android?
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Set the Thread object's reference to the Activity in the Activity's onResume. Unset it in the Activity's onPause. Do both under a synchronized lock that both the Activity and Thread respect.
– JohnnyLamb...
Programmatically get height of navigation bar
...n can not be manipulated because autolayout handles positions.
//[logoView setFrame:CGRectMake((self.navigationController.navigationBar.frame.size.width - targetWidth) / 2 , (self.navigationController.navigationBar.frame.size.height - targetHeight) / 2 , targetWidth, targetHeight)];
[logoView setFra...
Select parent element of known element in Selenium
...M tree when using element.findElement. The leading “./“ is required to set the context node.
– JimEvans
Nov 8 '18 at 15:29
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How do I know the script file name in a Bash script?
... ./s to get the name ./s instead of bash? I've found that $1 is not always set to ./s...
– David Mokon Bond
Feb 12 '13 at 14:14
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Can I underline text in an Android layout?
...xtview);
SpannableString content = new SpannableString("Content");
content.setSpan(new UnderlineSpan(), 0, content.length(), 0);
textView.setText(content);
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Amazon SimpleDB vs Amazon DynamoDB
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SimpleDB creates index for "EVERY" field in a table.
DynamoDB you have to set indexing fields before creating the database, and cannot be modified.
Pricing:
SimpleDB pricing is based on machine hours and storage capacity
DynamoDB charge money by capacity of Read/Writes records per seconds.
S...
fancybox2 / fancybox causes page to to jump to the top
... to scroll the content behind fancybox (this what will happen if locked is set to false.) This is a temporary workaround to an issue that may create another for some scenarios. This was a bug and it has been corrected in the latest master github.com/fancyapps/fancyBox/archive/master.zip
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PHP Fatal error: Using $this when not in object context
...created a static method something like:
static $foo; // your top variable set as static
public static function foo() {
return self::$foo;
}
then you can use this:
foobar::foobarfunc();
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