大约有 45,000 项符合查询结果（耗时：0.0607秒） [XML]
find() with nil when there are no records
...
you can do this a bit hackish, just use the ActiveRecord Query Interface.
this will return nil, instead of raising a Exception
User.where(:id => 10).first
shar...
Converting pfx to pem using openssl
...
You can use the OpenSSL Command line tool. The following commands should do the trick
openssl pkcs12 -in client_ssl.pfx -out client_ssl.pem -clcerts
openssl pkcs12 -in client_ssl.pfx -out root.pem -cacerts
If you want your file to be password protected etc, then there are ...
Which UUID version to use?
...ollide, unless you generate a billion UUIDs every second for a century and win a coin flip. Remember, set_size is 2^122, which is very big.
– Kevin
Aug 18 '15 at 1:17
8
...
Profiling Vim startup time
...abled when using Vim – I have collected plugins over the years. I’m a bit fed up with how long Vim takes to start now, so I’d like to profile its startup and see which of the many plugins I have are responsible.
...
Peak-finding algorithm for Python/SciPy
...
Detecting peaks in a spectrum in a reliable way has been studied quite a bit, for example all the work on sinusoidal modelling for music/audio signals in the 80ies. Look for "Sinusoidal Modeling" in the literature.
If your signals are as clean as the example, a simple "give me something with an a...
Difference between abstraction and encapsulation?
...
+100
Most answers here focus on OOP but encapsulation begins much earlier:
Every function is an encapsulation; in pseudocode:
point x ...
Difference between System.DateTime.Now and System.DateTime.Today
...signed to its Kind property. It is equivalent to calling any of the following:
DateTime.UtcNow.ToLocalTime()
DateTimeOffset.UtcNow.LocalDateTime
DateTimeOffset.Now.LocalDateTime
TimeZoneInfo.ConvertTime(DateTime.UtcNow, TimeZoneInfo.Local)
TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, TimeZon...
Make the current commit the only (initial) commit in a Git repository?
...lder commits, these commits will be accessible. In fact, for anyone with a bit of git foo, I'm sure that after this git push, they will still be able to recover all history from the GitHub repository - and if you have other branches or tags, then they don't even need much git foo.
...
Python nonlocal statement
... is perfectly idiomatic python, it seems that the first version would be a bit more obvious for beginners. Properly using generators, by calling the returned function, is a common point of confusion. The first version explicitly returns a function.
...
How to convert a string of numbers to an array of numbers?
... // no multiple args, just 1 function call
I hope it is a bit more clear.
share
|
improve this answer
|
follow
|
...