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Add a default value to a column through a migration
... it:
change_column :users, :admin, :boolean, :default => false
But some databases, like PostgreSQL, will not update the field for rows previously created, so make sure you update the field manaully on the migration too.
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Android Studio Editor Font Sizing
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Bah! I had a feeling it was something as simple as that. Thanks!
– Jonathan
Jul 2 '13 at 20:20
4
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Using Regular Expressions to Extract a Value in Java
...given string...
if (m.find()) {
// ...then you can use group() methods.
System.out.println(m.group(0)); // whole matched expression
System.out.println(m.group(1)); // first expression from round brackets (Testing)
System.out.println(m.group(2)); // second one (123...
Reverting single file in SVN to a particular revision
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but the next time you update it gets the file you didn't want back... :S
– andygoestohollywood
Nov 15 '13 at 9:53
2
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How do I get the object if it exists, or None if it does not exist?
...t in' way to do this. Django will raise the DoesNotExist exception every time.
The idiomatic way to handle this in python is to wrap it in a try catch:
try:
go = SomeModel.objects.get(foo='bar')
except SomeModel.DoesNotExist:
go = None
What I did do, is to subclass models.Manager, create ...
How to delete a remote tag?
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You just need to push an 'empty' reference to the remote tag name:
git push origin :tagname
Or, more expressively, use the --delete option (or -d if your git version is older than 1.8.0):
git push --delete origin tagname
Note that git has tag namespace and branch namespace so you may u...
Wait for page load in Selenium
...ebDriver> wait = new OpenQA.Selenium.Support.UI.WebDriverWait(driver, TimeSpan.FromSeconds(30.00));
wait.Until(driver1 => ((IJavaScriptExecutor)driver).ExecuteScript("return document.readyState").Equals("complete"));
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Test for multiple cases in a switch, like an OR (||)
... you use a switch case when you need to test for a or b in the same case?
6 Answers
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How do you add CSS with Javascript?
...so do this using DOM Level 2 CSS interfaces (MDN):
var sheet = window.document.styleSheets[0];
sheet.insertRule('strong { color: red; }', sheet.cssRules.length);
...on all but (naturally) IE8 and prior, which uses its own marginally-different wording:
sheet.addRule('strong', 'color: red;', -1);
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find -exec a shell function in Linux?
... with export -f, otherwise the subshell won't inherit them:
export -f dosomething
find . -exec bash -c 'dosomething "$0"' {} \;
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