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How do you query for “is not null” in Mongo?
...: 1 }
{ "_id" : ObjectId("544540f11b5cf91c4893eb99"), "otherField" : 2 }
Now, create the sparse index on imageUrl field:
db.foo.ensureIndex( { "imageUrl": 1 }, { sparse: true } )
{
"createdCollectionAutomatically" : false,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}
...
Does ARC support dispatch queues?
...he short answer: YES, ARC retains and releases dispatch queues.
And now for the long answer…
If your deployment target is lower than iOS 6.0 or Mac OS X 10.8
You need to use dispatch_retain and dispatch_release on your queue. ARC does not manage them.
If your deployment target is iOS 6...
Failed to instantiate module [$injector:unpr] Unknown provider: $routeProvider
...angular.js file. If you are continuing to use $routeProvider then you will now need to include angular-route.js in your HTML:
<script src="angular.js">
<script src="angular-route.js">
API Reference
You also have to add ngRoute as a dependency for your application:
var app = angular....
Vertically align text next to an image?
...;span style="">Works.</span>
</div>
Tested in FF3.
Now you can use flexbox for this type of layout.
.box {
display: flex;
align-items:center;
}
<div class="box">
<img src="https://placehold.it/60x60">
<span style="">Works.</span&g...
Converting a double to an int in C#
...t.ToInt32 will throw an exception. Cast will return an int, but you won'y know which one (in my implementation it's Int32.MinValue) because you're in unchecked context. (Should you be in checked context, the cast will throw an exception as well in these cases.)
– Jeppe Stig Nie...
What is the benefit of using $() instead of backticks in shell scripts?
...> parent=$(basename $(dirname $PWD))
pax> echo $parent
xyzzy
(a) Now that specific command may not actually work, I haven't tested the functionality. So, if you vote me down for it, you've lost sight of the intent :-) It's meant just as an illustration as to how you can nest, not as a bug-...
How to bind a List to a ComboBox?
...mber_CountryCombo
Box.ValueMember = "Name";
This is the code I am using now.
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python setup.py uninstall
...d also undo any other stuff that installation did manually.
If you don't know the list of all files, you can reinstall it with the --record option, and take a look at the list this produces.
To record a list of installed files, you can use:
python setup.py install --record files.txt
Once you wa...
keytool error Keystore was tampered with, or password was incorrect
...r description I assume you are on windows machine and your home is abc
So Now : Cause
When you run this command
keytool -genkey -alias tomcat -keyalg RSA
because you are not specifying an explicit keystore it will try to generate (and in your case as you are getting exception so to update) key...
Maven2: Missing artifact but jars are in place
From now to then, my Maven 2 started to mess around.
33 Answers
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