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Ruby on Rails Callback, what is difference between :before_save and :before_create?
...er_create
after_save
Update operations have exactly the same set, except read update instead of create everywhere (and UPDATE instead of INSERT).
From this, you can see that validation is carried out before the before_save and before_create callbacks.
The before_save occurs slightly before the ...
Building a fat jar using maven
...
Note: If you are a spring-boot application, read the end of answer
Add following plugin to your pom.xml
The latest version can be found at
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<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>...
Piping both stdout and stderr in bash?
...tdout and grep sees both strings on stdin, thus filters out both.
You can read more about redirection here.
Regarding your example (POSIX):
cmd-doesnt-respect-difference-between-stdout-and-stderr 2>&1 | grep -i SomeError
or, using >=bash-4:
cmd-doesnt-respect-difference-between-stdou...
Is it pythonic to import inside functions?
...port getopt and cmd just in main, because I want it to be clear to someone reading the code that these modules have nothing to do with the normal operation of the module and are only being included for testing.
share
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What's the best way to set a single pixel in an HTML5 canvas?
...Encoder(r,g,b,a);
// Writing the PNGEncoder is left as an exercise for the reader
creating another img or canvas filled with all the pixels you want and use drawImage() to blit just the pixel you want across. This would probably be very fast, but has the limitation that you need to pre-calculate th...
How can I add an empty directory to a Git repository?
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I think the README solution proposed by @JohnMee should be used together with this one; the .gitignore file provides an explanation of what we want to keep out of version control, while the README file explains what is the purpose of the...
Warning: Found conflicts between different versions of the same dependent assembly
...n the bin folder when that would happen. Debugging was a real pain. When I read your answer I realised this was exactly what was happening to me and I fixed it in like 5 minutes :)
– Dennis Puzak
Jan 13 '14 at 17:39
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Git authentication fails after enabling 2FA
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If you are already using ssh keys, after enabling 2FA it will enforce you to read/write remote with SSH. You don't really need to add personal tokens rather keep using your existing SSH key pair.
Just change your remote url from HTTPS to...
How to run multiple Python versions on Windows
...ython 3.3 or newer there's no need to install it as it comes with Python already) and either add shebang lines to your scripts;
#! c:\[path to Python 2.5]\python.exe - for scripts you want to be run with Python 2.5
#! c:\[path to Python 2.6]\python.exe - for scripts you want to be run with Python ...
Calculate age given the birth date in the format YYYYMMDD
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I would go for readability:
function _calculateAge(birthday) { // birthday is a date
var ageDifMs = Date.now() - birthday.getTime();
var ageDate = new Date(ageDifMs); // miliseconds from epoch
return Math.abs(ageDate.getUTCFull...