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How to get the original value of an attribute in Rails
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the documentation can be found at apidock.com/rails/ActiveModel/Dirty/attribute_was
– hexinpeter
Jan 21 '16 at 6:07
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How do I launch the Android emulator from the command line?
...droid create avd -n <name> -t <targetID> where targetID is the API level you need. If you can use GUI, just type in android avd and it will launch the manager, where you can do the same. You can read more about AVD management through GUI and through command line.
Run the AVD either by us...
doGet and doPost in Servlets
...fe). So I would strongly recommend to learn a bit more about basic Java SE API using the Oracle tutorials (check the chapter "Trails Covering the Basics") and how to use JSP/Servlets the right way using those tutorials.
See also:
Our servlets wiki page
Java EE web development, where do I start an...
How to see if an object is an array without using reflection?
...s saying down below. My solution uses pure linguistic construct instead of API call.
– polygenelubricants
Apr 28 '10 at 8:38
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Parse a .py file, read the AST, modify it, then write back the modified source code
...ou can parse the python code (represented in string) by simply calling the API ast.parse(). This returns the handle to Abstract Syntax Tree (AST) structure. Interestingly you can compile back this structure and execute it as shown above.
Another very useful API is ast.dump() which dumps the whole A...
Array.push() if does not exist?
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http://api.jquery.com/jQuery.unique/
var cleanArray = $.unique(clutteredArray);
you might be interested in makeArray too
The previous example is best in saying that check if it exists before pushing.
I see in hindsight it also s...
Entity Framework code first unique column
...unnecessary: you can add an index as suggested by juFo.
If you use Fluent API instead of attributing UserName property your column annotation should look like this:
this.Property(p => p.UserName)
.HasColumnAnnotation("Index", new IndexAnnotation(new[] {
new IndexAttribute("Index") ...
Change priorityQueue to max priorityqueue
...());
}
}
}
Reference :https://docs.oracle.com/javase/7/docs/api/java/util/PriorityQueue.html#comparator()
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Update MongoDB field using value of another field
...DB 2.6 and 3.0
From this version you need to use the now deprecated Bulk API and its associated methods.
var bulk = db.collection.initializeUnorderedBulkOp();
var count = 0;
cursor.snapshot().forEach(function(document) {
bulk.find({ '_id': document._id }).updateOne( {
'$set': { 'nam...
Twitter Bootstrap Tabs: Go to Specific Tab on Page Reload or Hyperlink
...a[href="#'+url.split('#')[1]+'"]').tab('show') ;
}
// With HTML5 history API, we can easily prevent scrolling!
$('.nav-tabs a').on('shown.bs.tab', function (e) {
if(history.pushState) {
history.pushState(null, null, e.target.hash);
} else {
window.location.hash = e.target....