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Difference between attr_accessor and attr_accessible
...stname" and "role" :
SQL instructions :
CREATE TABLE users (
firstname string,
lastname string
role string
);
I assumed that you set the option config.active_record.whitelist_attributes = true in your config/environment/production.rb to protect your application from Mass assignment exploit...
How to round to 2 decimals with Python?
...en(str(val))-1), digits)
Basically this adds a really small value to the string to force it to round up properly on the unpredictable instances where it doesn't ordinarily with the round function when you expect it to. A convenient value to add is 1e-X where X is the length of the number string y...
OS specific instructions in CMAKE: How to?
...
STREQUAL accepts variables (in addition to string) as first operand, so it could be the more concise if(CMAKE_SYSTEM_NAME STREQUAL "Linux")...
– Ad N
Jul 6 at 14:37
...
CSV API for Java [closed]
...'ve used OpenCSV in the past.
import au.com.bytecode.opencsv.CSVReader;
String fileName = "data.csv";
CSVReader reader = new CSVReader(new FileReader(fileName ));
// if the first line is the header
String[] header = reader.readNext();
// iterate over reader.readNext until it returns null
String[...
Adding a directory to $LOAD_PATH (Ruby)
...
Also, it's a lot harder to Google for strings like "$:" that contain only symbols.
– DSimon
Apr 19 '12 at 3:39
add a comment
...
How to call a Parent Class's method from Child Class in Python?
...y haven't been overwritten.
e.g. in python 3:
class A():
def bar(self, string):
print("Hi, I'm bar, inherited from A"+string)
class B(A):
def baz(self):
self.bar(" - called by baz in B")
B().baz() # prints out "Hi, I'm bar, inherited from A - called by baz in B"
yes, this may be fa...
C# generic type constraint for everything nullable
...oo<int?>();
Console.WriteLine(foo1.IsNull());
var foo2 = new Foo<string>();
Console.WriteLine(foo2.IsNull());
var foo3= new Foo<int>(); // THROWS
Console.WriteLine(foo3.IsNull());
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...
What is the best way to determine the number of days in a month with JavaScript?
...
To take away confusion I would probably make the month string based as it is currently 1 based.
function daysInMonth(month,year) {
monthNum = new Date(Date.parse(month +" 1,"+year)).getMonth()+1
return new Date(year, monthNum, 0).getDate();
}
daysInMonth('feb', 2015)
/...
Iteration over std::vector: unsigned vs signed index variable
...++, you normally need to set it to work with the new standard by giving an extra flag:
g++ -std=c++0x -o auto auto.cpp
Now you can run the example:
$ ./auto
17
12
23
42
Please note that the instructions on compiling and running are specific to gnu c++ compiler on Linux, the program should be p...
Immutable vs Mutable types
...o
x = 5.0
x += 7.0
print x # 12.0
Doesn't that "mut" x?
Well you agree strings are immutable right? But you can do the same thing.
s = 'foo'
s += 'bar'
print s # foobar
The value of the variable changes, but it changes by changing what the variable refers to. A mutable type can change that wa...