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Rails :dependent => :destroy VS :dependent => :delete_all
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The difference is with the callback.
The :delete_all is made directly in your application and ...
What's the difference between deadlock and livelock?
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402
Taken from http://en.wikipedia.org/wiki/Deadlock:
In concurrent computing, a deadlock is a sta...
When to use f:viewAction / preRenderView versus PostConstruct?
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When should one use the f:viewAction or preRenderView event to initialize data for a page verse...
Difference between std::result_of and decltype
I have some trouble understanding the need for std::result_of in C++0x. If I understood correctly, result_of is used to obtain the resulting type of invoking a function object with certain types of parameters. For example:
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async await return Task
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edited Oct 20 '15 at 19:52
bashis
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How to create an empty file at the command line in Windows?
...NUL EmptyFile.txt
"How to create empty text file from a batch file?" (2008) also points to:
type NUL > EmptyFile.txt
# also
echo. 2>EmptyFile.txt
copy nul file.txt > nul # also in qid's answer below
REM. > empty.file
fsutil file createnew file.cmd 0 # to create a file on a mapped dr...
Export specific rows from a PostgreSQL table as INSERT SQL script
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edited Dec 28 '18 at 10:39
Abdellah Alaoui
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How do I make a matrix from a list of vectors in R?
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[8,] 8 1 2 3 4 5
[9,] 9 1 2 3 4 5
[10,] 10 1 2 3 4 5
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How to collapse all methods in Xcode?
...ode 6.1.1
– Cesare
Mar 17 '15 at 17:07
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Is there a way to zoom the Visual Studio text editor with a keyboard shortcut?
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edited Jun 22 '10 at 20:36
Michael Mrozek
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