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mongoDB/mongoose: unique if not null
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Just a quick update to those researching this topic.
The selected answer will work, but you might want to consider using partial indexes instead.
Changed in version 3.2: Starting in MongoDB 3.2, MongoDB provides the
option to create partial indexes. Partial indexes offer a su...
SOAP or REST for Web Services? [closed]
...hod. With SOAP you have the burden of right-clicking on your reference and selecting "update" and then fixing a few compile errors. (Sarcasm included free of charge.)
– Josh M.
Nov 4 '10 at 18:36
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Android static object lifecycle
...vity
state so that on restart, the fields
get filled with their previously
selected values, you can implement
the onSaveInstanceState() activity
method - note that this is not
recommended for between activities
persistance of states.
You can get some code examples of the usage of preferences, inte...
HashSet versus Dictionary w.r.t searching time to find if an item exists
...value);
}
var testPoints = Enumerable.Repeat(1, TestReps).Select(_ => rand.Next()).ToArray();
var timer = new Stopwatch();
var total = 0;
timer.Restart();
for (int i = 0; i < TestReps; i++)
{
var newKey =...
How to get a pixel's x,y coordinate color from an image?
Is there any way to check if a selected(x,y) point of a PNG image is transparent?
4 Answers
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In absence of preprocessor macros, is there a way to define practical scheme specific flags at proje
...BGU key work in #IF DEBUG works in debug mode and #ELSE in release mode:
Select your target,
In Build Setting tab search for "Active Compilation Condition",
Set the value of its "Debug" item to "YourKeyWord",
Use simply as follow:
#if DEBUG
print("You'r running in DEBUG mode!")
#else
prin...
How to store a list in a column of a database table
... the names that you have given to your girl friend id 1 then you can use:
select names from nicknames where id = 1;
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Amazon S3 direct file upload from client browser - private key disclosure
... using AWS Signature version 4.
Will summarize here:
As soon as the user selects a file to be uploaded, do the followings:
1. Make a call to the web server to initiate a service to generate required params
In this service, make a call to AWS IAM service to get temporary cred
Once you have the cr...
The difference between the 'Local System' account and the 'Network Service' account?
...-20)
If trying to schedule a task using it, enter NETWORK SERVICE into the Select User or Group dialog
LocalSystem account (dangerous, don't use!)
Completely trusted account, more so than the administrator account. There is nothing on a single box that this account cannot do, and it has th...
How can I change my Cygwin home folder after installation?
...nced >> Environment Variables >> User Variables for >> [select variable HOME] >> edit
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