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Find and replace string values in list
... Performing a comparison between this list comprehension method and the map method (posted by @Anthony Kong), this list method was roughly 2x faster. Also it allowed for inserting multiple replacements into the same call, e.g. resname = [name.replace('DA', 'ADE').replace('DC', 'CYT').repl...
What is the difference between pluck and collect in Rails?
...er.first.gifts.collect(&:id)
You have objects with all fields loaded and you simply get the id thanks to the method based on Enumerable.
So:
if you only need the id with Rails 4, use ids: User.first.gifts.ids
if you only need some fields with Rails 4, use pluck: User.first.gifts.pluck(:id, ...
How to keep a git branch in sync with master
...git checkout master
git merge mobiledevicesupport
git push origin master
and thats it.
the assumption here is that mobilexxx is a topic branch with work that isn't ready to go into your main branch yet. So only merge into master when mobiledevicesupport is in a good place
...
Handle spring security authentication exceptions with @ExceptionHandler
I'm using Spring MVC's @ControllerAdvice and @ExceptionHandler to handle all the exception of a REST Api. It works fine for exceptions thrown by web mvc controllers but it does not work for exceptions thrown by spring security custom filters because they run before the controller methods are inv...
Comparison of Android networking libraries: OkHTTP, Retrofit, and Volley [closed]
Two-part question from an iOS developer learning Android, working on an Android project that will make a variety of requests from JSON to image to streaming download of audio and video:
...
Does PNG contain EXIF data like JPG?
...llows, however, to embed metadata "chunks" inside the image. Some of the standardized chunks correspond to a few EXIF attributes (physical dimensions, timestamp). And it's also possible to store arbitrary textual data as key=>value pairs, or to define new chunk types. So, you could in theory stor...
Cancel a UIView animation?
... is to create a new animation to your end point. Set a very short duration and make sure you use the +setAnimationBeginsFromCurrentState: method to start from the current state. When you set it to YES, the current animation is cut short. Looks something like this:
[UIView beginAnimations:nil contex...
PHP and MySQL - how to avoid password in source code? [duplicate]
...configuration file.
Many frameworks use this (Zend, CakePHP, Kohana, etc) and it's the most common way of doing things (even in a non-PHP environment such as ASP.NET with its web.config files). This allows you also to copy over configuration values from environment to environment by just copying th...
How to create a custom attribute in C#
I have tried lots of times but still I am not able to understand the usage of custom attributes (I have already gone through lots of links).
...
How does having a dynamic variable affect performance?
...hat just has the metadata analyzer, the semantic analyzer for expressions, and an emitter that emits Expression Trees instead of IL.
The metadata analyzer uses Reflection to determine the type of the object in d1, and then passes that to the semantic analyzer to ask what happens when such an objec...