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Filter by property
...) if x.myProperty == [...]]
MyModel.objects.filter(id__in=objects_id)
I know it's not the most performatic solution, but may help in simple cases as mine
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How to remove all of the data in a table using Django
...4.html') ##
it ended deleting all entries from - model == model_4 , but now i get to see a Error screen within Admin console when i try to asceratin that all objects of model_4 have been deleted ...
ProgrammingError at /admin/dc_dash/model_4/
relation "dc_dash_model_4" does not exist
LINE 1: SEL...
Date vs DateTime
...ortion of the value.
public static void Main()
{
System.DateTime _Now = DateAndTime.Now;
Console.WriteLine("The Date and Time is " + _Now);
//will return the date and time
Console.WriteLine("The Date Only is " + _Now.Date);
//will return only the date
Console.Write("Pres...
How do I parallelize a simple Python loop?
...order given: [0, 4, 16, 36, 64, 100, 144, 196, 256, 324]
Multithreading
Now change ProcessPoolExecutor to ThreadPoolExecutor, and run the module again:
$ python3 -m futuretest
original inputs: [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0]
total time to execute 19 = sum([0, 2, 3, 5, 2, 0, 0,...
Access data in package subdirectory
...th modules that need to open data files in a ./data/ subdirectory. Right now I have the paths to the files hardcoded into my classes and functions. I would like to write more robust code that can access the subdirectory regardless of where it is installed on the user's system.
...
What is the difference between “text” and new String(“text”)?
...
If i write: String s = new String("abc"); And now i write: String s = "abc"; Will String s = "abc"; create a new String literal in the String pool?
– Kaveesh Kanwal
Apr 16 '15 at 18:34
...
Caching a jquery ajax response in javascript/browser
...ve to bother with all the mess in the $.ajax() as I use $.ajaxPrefilter(). Now just setting {cache: true} is enough to handle the cache correctly :
var localCache = {
/**
* timeout for cache in millis
* @type {number}
*/
timeout: 30000,
/**
* @type {{_: number, data...
SQL Server: Query fast, but slow from procedure
...
This can now be achieved using the query hint - OPTION (OPTIMIZE FOR (@varA UNKNOWN, @varB UNKNOWN)
– Dave
Feb 20 '17 at 21:08
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Check if OneToOneField is None in Django
... doesn't work all the time. In case you want to work with select_related() now or in the future -- or maybe even to be sure you also handle other sorts of magic which may happen elsewhere -- you have to extend the test as follows: if hasattr(object, 'onetoonerevrelattr') and object.onetoonerevrelatt...
Best way to do multiple constructors in PHP
...l properties from array
}
}
?>
Then if i want a Student where i know the ID:
$student = Student::withID( $id );
Or if i have an array of the db row:
$student = Student::withRow( $row );
Technically you're not building multiple constructors, just static helper methods, but you get to ...