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How does deriving work in Haskell?
...ese type classes: http://www.haskell.org/onlinereport/derived.html#derived-appendix
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Bulk insert with SQLAlchemy ORM
...e in performance on the server side resulting in about 10x more inserts/s. Apparently is bulk-loading using \copy (or COPY on the server) using a packing in communicating from client-to-server a LOT better than using SQL via SQLAlchemy. More info: Large bulk insert performance difference PostgreSQL ...
How do I export UIImage array as a movie?
...has an input of type AVAssetWriterInput, which in turn has a method called appendSampleBuffer: that lets you add individual frames to a video stream. Essentially you’ll have to:
1) Wire the writer:
NSError *error = nil;
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
[NSURL ...
In Vim is there a way to delete without putting text in the register?
...
It's handy to have an easy mapping which lets you replace the current selection with buffer.
For example when you put this in your .vimrc
vmap r "_dP // it's a capital 'p' on the end
then, after copying something into register (i.e. with 'y'),...
Given a view, how do I get its viewController?
...ments the method by returning its view’s superview; UIWindow returns the application object, and UIApplication returns nil.
So, if you recurse a view’s nextResponder until it is of type UIViewController, then you have any view’s parent viewController.
Note that it still may not have a paren...
Ship an application with a database
If your application requires a database and it comes with built in data, what is the best way to ship that application? Should I:
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Python __str__ versus __unicode__
...s override __unicode__() more frequently than __str__() but it doesn't appear to be consistent. Are there specific rules when it is better to implement one versus the other? Is it necessary/good practice to implement both?
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django urls without a trailing slash do not redirect
I've got two applications located on two separate computers. On computer A, in the urls.py file I have a line like the following:
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Recommended way to save uploaded files in a servlet application
... world code there are circumstances where storing uploaded files in the webapp's deploy folder will not work at all. Some servers do (either by default or by configuration) not expand the deployed WAR file into the local disk file system, but instead fully in the memory. You can't create new files i...
Does Swift support reflection?
...there's the start of some reflection support:
class Fruit {
var name="Apple"
}
reflect(Fruit()).count // 1
reflect(Fruit())[0].0 // "name"
reflect(Fruit())[0].1.summary // "Apple"
From mchambers gist, here:
https://gist.github.com/mchambers/fb9da554898dae3e54f2
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