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Add a reference column migration in Rails 4
... Active Record only supports single column foreign keys and currently only mysql, mysql2 and PostgreSQL adapters are supported. Don't try this with other adapters like sqlite3, etc. Refer to Rails Guides: Foreign Keys for your reference.
...
What's the difference between window.location= and window.location.replace()?
...oad and just do it the way that it probably should be done.
location = "#/mypath/otherside"
var sections = location.split('/')
This code is perfectly correct syntax-wise, logic wise, type-wise
you know the only thing wrong with it?
it has location instead of location.href
what about this
var ...
Overriding fields or properties in subclasses
...ic behavior. You should remember though, that when at runtime the property MyInt is accessed, the derived class has no control on the value returned. The base class by itself is capable of returning this value.
This is how a truly polymorphic implementation of your property might look, allowing the...
How do you display a Toast from a background thread on Android?
...
I'm not sure I understand how to do this. I have my existing public void run(). I tried putting this code there. I know that's not right because it didn't work, but I am really stuck.
– SwimBikeRun
Mar 4 '12 at 6:04
...
JS: iterating over result of getElementsByClassName using Array.forEach
...r NodeList) as the this value:
var els = document.getElementsByClassName("myclass");
Array.prototype.forEach.call(els, function(el) {
// Do stuff here
console.log(el.tagName);
});
// Or
[].forEach.call(els, function (el) {...});
If you're in the happy position of being able to use ES6 (...
Programmatically get height of navigation bar
...e if the NavigationController, aka, the MoreViewController, is showing for my tab bar app.
– user420479
Sep 5 '11 at 21:10
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Pass a JavaScript function as parameter
...
@Steve Fenton: after reading your reply I asked myself why did I ask... :-)
– Veverke
Nov 25 '14 at 15:52
1
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How to get current CPU and RAM usage in Python?
...em very accurate. A quick test showed resource being off by about 2MB from my mac's utility tool.
– Austin A
Jul 17 '15 at 4:31
12
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How to wait for all goroutines to finish without using time.Sleep?
... Adapting this code caused me a long debugging session because my goroutine was a named function and passing in the WaitGroup as a value will copy it and make wg.Done() ineffective. While this could be fixed by passing a pointer &wg, a better way to prevent such errors is to declare ...
How do I know the script file name in a Bash script?
...gt; ${0} "
echo "# parent path --------------> ${0%/*} "
echo "# my name ------------------> ${0##*/} "
echo
exit
# ------------- CALLED ------------- #
# Notice on the next line, the first argument is called within double,
# and single quotes, since it contains two words
$ /misc/...