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Index on multiple columns in Ruby on Rails
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Both. validates_uniqueness_of can be used to display an error message gracefully in the application for example when a form gets saved. Database constraint would make sure you don't end up with dup records even know you had validation specified in the model. Plus, you can rescue t...
Why is === faster than == in PHP?
... use === unless type conversion is needed, it will help to reduce semantic error (even if it's once in your entire life). It also helps the next person reading the code what rules are enforced. You write once, it's read a few hundred times, if it can help clear up one person's doubt, it's already su...
Git Diff with Beyond Compare
...ted (before it used to show me the default console diff). Now it gives me 'error: cannot spawn bc3: No such file or directory\nexternal diff died, stopping at file.txt'
– Epu
Mar 23 '12 at 0:39
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Get the data received in a Flask request
...content type is not correct, None is returned. If the data is not JSON, an error is raised.
@app.route("/something", methods=["POST"])
def do_something():
data = request.get_json()
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imp...
Correct way to quit a Qt program?
...e you can provide a non-zero returnCode which, by convention, indicates an error.
It is important to note that "if the event loop is not running, this function (QCoreApplication::exit()) does nothing", so in that case you should call exit(EXIT_FAILURE).
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Rsync copy directory contents but not directory itself
...t odd that the -a option was needed. If I don't use '-a' then I'll get an error skipping the directory and nothing happens. Reading the man pages, I wouldn't have concluded that. It seems like based on the docs that it should work without the -a option and the -v option is only for verbosity so t...
How to use Fiddler to monitor WCF service
...nfig lines after closing the fiddler, because if you don't it will make an error.
Reference : http://fiddler2.com/documentation/Configure-Fiddler/Tasks/UseFiddlerAsReverseProxy
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Remove the last line from a file in Bash
...a few extra functions.
If you're going to use these repeatedly and want error handling and some other features, you can use the poptail command here:
https://github.com/donm/evenmoreutils
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Which one will execute faster, if (flag==0) or if (0==flag)?
...e
{
// code never executes
}
if (0 = flag) // typo and syntactic error -> compiler complains
{
// ...
}
While it's true, that e.g. a C-compiler does warn in case of the former (flag = 0), there are no such warnings in PHP, Perl or Javascript or <insert language here>.
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Git on Bitbucket: Always asked for password, even after uploading my public SSH key
...hat case, can you provide your machine / OS and git version info? And the error message if any when you try to set the cache setting.
– Ajeet Shah
Mar 20 '18 at 6:55
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