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What is `params.require(:person).permit(:name, :age)` doing in Rails 4?
...rameter is present, and if it's not provided, the require method throws an error. It returns an instance of ActionController::Parameters for the key passed into require.
The permit method returns a copy of the parameters object, returning only the permitted keys and values. When creating a new Acti...
Why do we need extern “C”{ #include } in C++?
...y than a C compiler would, so when you try to link, you would get a linker error saying there were missing symbols.
To resolve this, we tell the C++ compiler to run in "C" mode, so it performs name mangling in the same way the C compiler would. Having done so, the linker errors are fixed.
...
How do I get a PHP class constructor to call its parent's parent's constructor?
...t understand how. Declaring __construct as static results in the following error for me "Fatal error: Constructor Grandpa::__construct() cannot be static" under PHP5.3
– Mark
Oct 13 '09 at 4:08
...
What is an IndexOutOfRangeException / ArgumentOutOfRangeException and how do I fix it?
...lidated arguments (from user input or from function user) you may get this error:
private static string[] RomanNumbers =
new string[] { "I", "II", "III", "IV", "V" };
public static string Romanize(int number)
{
return RomanNumbers[number];
}
Unexpected Results
This exception may be throw...
Orchestration vs. Choreography
...reography
Reliability: Orchestration platforms have built-in support for error handling and transaction management (compensating transactions). In choreography, custom-developed workflow and error handling tends to be more error-prone.
Modifiability: Creating and changing process workflows and com...
Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive
...framework 4.0 and convert this into application in IIS then its shows this error
7 Answers
...
Returning multiple values from a C++ function
... put the function definition of divide into a separate cpp file? I get the error error: use of ‘auto divide(int, int)’ before deduction of ‘auto’. How do I solve this?
– Adriaan
Feb 23 '18 at 20:26
...
Regarding 'main(int argc, char *argv[])' [duplicate]
...Zero indicates success, while any
// Non-Zero value indicates a failure/error
}
In the early versions of the C language, there was no int before main as this was implied. Today, this is considered to be an error.
On POSIX-compliant systems (and Windows), there exists the possibility to use a t...
Should you always favor xrange() over range()?
...cent call last):
File "<stdin>", line 1, in <module>
OverflowError: Python int too large to convert to C long
Python 3 does not have this problem:
Python 3.2.3 (default, Jul 14 2012, 01:01:48)
[GCC 4.7.1] on linux2
Type "help", "copyright", "credits" or "license" for more informati...
Key hash for Android-Facebook app
...continuing with the openSSL. Otherwise you'd be hashing the wrong password error text :)
– Vaiden
Jan 6 '13 at 16:37
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