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Rails: around_* callbacks
...api.rubyonrails.org/classes/ActiveRecord/Callbacks.html , but don't understand when the around_* callbacks are triggered in relation to before_* and after_* .
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git - diff of current changes before committing
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git diff by default shows difference between your working directory and the index (staging area for the next commit).
If you have already added (staged) the changes to the staging area, git diff --staged does the job. Staging area is the data from which the next commit will be formed by git...
How to append text to an existing file in Java?
...so there are several libraries for this. Two of the most popular are Log4j and Logback.
Java 7+
If you just need to do this one time, the Files class makes this easy:
try {
Files.write(Paths.get("myfile.txt"), "the text".getBytes(), StandardOpenOption.APPEND);
}catch (IOException e) {
//e...
Checking for an empty field with MySQL
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An empty field can be either an empty string or a NULL.
To handle both, use:
email > ''
which can benefit from the range access if you have lots of empty email record (both types) in your table.
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How do you Programmatically Download a Webpage in Java
I would like to be able to fetch a web page's html and save it to a String , so I can do some processing on it. Also, how could I handle various types of compression.
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Command substitution: backticks or dollar sign / paren enclosed? [duplicate]
What's the preferred way to do command substitution in bash?
3 Answers
3
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Create Test Class in IntelliJ
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In my project for some reason, even though the class and the test class are located in the same package, when I did Ctrl+Shift+T it says "No Test Class Found". Also, when I right click on the test file, it only gives me the option to compile test, but not run test. Any idea?
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Most efficient way of making an if-elif-elif-else statement when the else is done the most?
...e': 3})
for i in xrange(1000000):
the_thing = options[something]
...and note the amount of CPU time they use...
1.py: 160ms
2.py: 170ms
3.py: 110ms
4.py: 100ms
...using the user time from time(1).
Option #4 does have the additional memory overhead of adding a new item for every distinct k...
JavaScript: How do I print a message to the error console?
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Install Firebug and then you can use console.log(...) and console.debug(...), etc. (see the documentation for more).
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Enterprise Library Unity vs Other IoC Containers [closed]
What's pros and cons of using Enterprise Library Unity vs other IoC containers (Windsor, Spring.Net, Autofac ..)?
8 Answers...