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Determine what attributes were changed in Rails after_save callback?
...on_after_change
Notification.send(…) if (saved_change_to_published? && self.published == true)
end
end
Or if you prefer, saved_change_to_attribute?(:published).
Rails 3–5.1
Warning
This approach works through Rails 5.1 (but is deprecated in 5.1 and has breaking changes...
Best way to generate random file names in Python
...at is a good, or the best way to generate some random text to prepend to a file(name) that I'm saving to a server, just to make sure it does not overwrite. Thank you!
...
What are the mechanics of short string optimization in libc++?
...ol __is_long() const _NOEXCEPT
{ return bool(__r_.first().__s.__size_ & __short_mask); }
// __r_.first() -> __rep const&
// .__s -> __short const&
// .__size_ -> unsigned char
To be honest, I am not too sure this is Standard C++ (I know the initial subsequence...
how to debug the js in jsfiddle
...ever using chrome dev tools. Press ctrl+shift+F and you can search through all the files in the source.
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How to filter object array based on attributes?
...
var newArray = homes.filter(function (el) {
return el.price <= 1000 &&
el.sqft >= 500 &&
el.num_of_beds >=2 &&
el.num_of_baths >= 2.5;
});
Live Example:
var obj = {
'homes': [{
"home_id": "1",
"pr...
Why no generics in Go?
... id types. Type information is preserved and can be "cast" (asserted, actually) back to its concrete type. Get the gritty details here: golang.org/ref/spec#Type_assertions
– tbone
Aug 25 '13 at 20:50
...
JavaScript for detecting browser language preference [duplicate]
...it there in perpetuity so feel free to use it in your code.
Here's some example code (in jQuery) for how you might use it
$.ajax({
url: "http://ajaxhttpheaders.appspot.com",
dataType: 'jsonp',
success: function(headers) {
language = headers['Accept-Language'];
nowDoS...
IllegalStateException: Can not perform this action after onSaveInstanceState with ViewPager
...is not possible to avoid the IllegalStateException in the callback, catch & ignore it.
try {
activity.getSupportFragmentManager().popBackStackImmediate(name);
} catch (IllegalStateException ignored) {
// There's no way to avoid getting this if saveInstanceState has already been called.
...
Merge (with squash) all changes from another branch as a single commit
In Git, is there a way to merge all changes from one branch into another, but squash to a single commit at the same time?
...
Reading Xml with XmlReader in C#
...ed a small portion of the document in memory at any one time. Here's some sample code (adapted slightly from this blog post):
static IEnumerable<XElement> SimpleStreamAxis(string inputUrl,
string elementName)
{
using (XmlReader reader = XmlReade...