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How update the _id of one MongoDB Document?
...
To do it for your whole collection you can also use a loop (based on Niels example):
db.status.find().forEach(function(doc){
doc._id=doc.UserId; db.status_new.insert(doc);
});
db.status_new.renameCollection("status", true);
In this case UserId was the new ID I wanted to use
...
B-Tree vs Hash Table
... to be re-built. Usually this is not a problem, but for huge-huge-huge databases, this can take days.
The trade off for tree algorithms is small and they are suitable for almost every use case and thus are default.
However if you have a very precise use case and you know exactly what and only what i...
Can you resolve an angularjs promise before you return it?
... This answer also applies to Kris Kowal's Q which Angular's promises are based on.
– Keith
Feb 24 '15 at 20:17
I add...
Set active tab style with AngularJS
...ler($scope, $route) {
$scope.$route = $route;
}
Set the active class based on the current active tab:
<li ng-class="{active: $route.current.activetab == 'dashboard'}"></li>
<li ng-class="{active: $route.current.activetab == 'lab'}"></li>
...
Rails: confused about syntax for passing locals to partials
...er to learn about this, I went directly to the code itself (actionpack/lib/base.rb, render() method in Rails 2; Rails 3 is different). It's a good exercise.
Furthermore, don't worry about "bothering" people on SO. That's why this site exists. I even learned something from this.
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In what situations would AJAX long/short polling be preferred over HTML5 WebSockets?
... is that it is not an HTTP request (after handshake), but a proper message based communication protocol. This enables you to achieve huge performance and architecture advantages. For example, in node.js, you can share the same memory for different socket connections, so they can each access shared v...
Is it possible to use raw SQL within a Spring Repository
...tory, is this possible? Everything I see around @Query is always entity based.
5 Answers
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How to share my Docker-Image without using the Docker-Hub?
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Based on this blog, one could share a docker image without a docker registry by executing:
docker save --output latestversion-1.0.0.tar dockerregistry/latestversion:1.0.0
Once this command has been completed, one could cop...
What is the Invariant Culture?
...
A fake culture based on English with defined behavior. Great to write out, for example, stuff into config files so it can be read and written regardless of the culture the user has defined.
Basically it is a specific culture that is artifi...
How to implement an STL-style iterator and avoid common pitfalls?
...ze size) { return ptr_iterator<T>(val) + size; }
Raw pointer range based loop workaround. Please, correct me, if there is better way to make range based loop from raw pointer.
template<typename T>
class ptr_range
{
T* begin_;
T* end_;
public:
ptr_range(T* ptr, size_t lengt...