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How to use Active Support core extensions
...to add Active Support to a non-Rails script.
Read "How to Load Core Extensions".
Active Support's methods got broken into smaller groups in Rails 3, so we don't end up loading a lot of unneeded stuff with a simple require 'activesupport'. Now we have to do things like
require 'active_support/co...
Python memory leaks [closed]
...s article: Tracing python memory leaks
Also, note that the garbage collection module actually can have debug flags set. Look at the set_debug function. Additionally, look at this code by Gnibbler for determining the types of objects that have been created after a call.
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How do I perform the SQL Join equivalent in MongoDB?
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As of Mongo 3.2 the answers to this question are mostly no longer correct. The new $lookup operator added to the aggregation pipeline is essentially identical to a left outer join:
https://docs.mongodb.org/master/reference/operator/aggregation/lookup/#pipe._S_looku...
How to add a filter class in Spring Boot?
I wonder, if there is any annotation for a Filter class (for web applications) in Spring Boot? Perhaps @Filter ?
23 Ans...
Convert JsonNode into POJO
...lass);
where jsonObjectMapper is a Jackson ObjectMapper.
In older versions of Jackson, it would be
MyClass newJsonNode = jsonObjectMapper.readValue(someJsonNode, MyClass.class);
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impro...
Turning Sonar off for certain code
... mechanism though, which consists in adding the @SuppressFBWarnings annotation:
@edu.umd.cs.findbugs.annotations.SuppressFBWarnings(
value = "NAME_OF_THE_FINDBUGS_RULE_TO_IGNORE",
justification = "Why you choose to ignore it")
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What is the difference between Normalize.css and Reset CSS?
...size rendering for pre, SVG overflow in IE9, and the button styling bug in iOS.
Normalize.css doesn't clutter your dev tools. A common irritation when using reset.css is the large inheritance chain that is displayed in browser CSS debugging tools. This is not such an issue with normalize.css because...
UIGestureRecognizer on UIImageView
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Check that userInteractionEnabled is YES on the UIImageView. Then you can add a gesture recognizer.
imageView.userInteractionEnabled = YES;
UIPinchGestureRecognizer *pgr = [[UIPinchGestureRecognizer alloc]
initWithTarget:self action:@selecto...
如何高效的学习掌握新技术 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...合适的书，所以我直接去它的官方网站(http://facebook.github.io/react/) ，把Getting Started里面的文章快速的浏览了一遍，基本上算是有了个大概的了解。而且现在网络上相关文章也比较多，通过搜索，也能找到很多相关的文章和资料。
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How to safely open/close files in python 2.4
... f.close()
This ensures that even if # do stuff with f raises an exception, f will still be closed properly.
Note that open should appear outside of the try. If open itself raises an exception, the file wasn't opened and does not need to be closed. Also, if open raises an exception its result i...