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Rails “validates_uniqueness_of” Case Sensitivity
...important):
Process A gets a request to create a new user with the name 'foo'
Process B does the same thing
Process A validates the uniqueness of 'foo' by asking the DB if that name exists yet and the DB says the name doesn't exist yet.
Process B does the same thing and gets the same response
Proc...
What is HEAD in Git?
...So if you did a git log and got something like commit ad0265... HEAD -> foo ... that would mean the foo branch is a reference to commit id ad0265. Doing a checkout of the text reference foo is not a detached head. Doing a checkout of the commit id ad0265 would result in a detached head. May be...
Testing Abstract Classes
...nd as an arbitrary answer: You have an abstract class 'A' having a common 'foo()' method. This 'foo()' method is being used overall all 'B', and 'C' classes, both derive from 'A'. Which class would you choose to test 'foo()'?
– user3790897
Aug 21 '17 at 14:28
...
Using NSPredicate to filter an NSArray based on NSDictionary keys
...ata = [NSArray arrayWithObject:[NSMutableDictionary dictionaryWithObject:@"foo" forKey:@"BAR"]];
NSArray *filtered = [data filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(BAR == %@)", @"foo"]];
Filtered in this case contains the dictionary.
(the %@ does not have to be quoted,...
How can I recover the return value of a function passed to multiprocessing.Process?
...to get a value from a Process using Queue:
import multiprocessing
ret = {'foo': False}
def worker(queue):
ret = queue.get()
ret['foo'] = True
queue.put(ret)
if __name__ == '__main__':
queue = multiprocessing.Queue()
queue.put(ret)
p = multiprocessing.Process(target=worker,...
.htaccess mod_rewrite - how to exclude directory from rewrite rule
...ticular directory from the rule (meaning, you want to remove the directory foo) ,you can use :
RewriteEngine on
RewriteCond %{REQUEST_URI} !^/foo/$
RewriteRule !index\.php$ /index.php [L]
The rewriteRule above will rewrite all requestes to /index.php excluding requests for /foo/ .
To exclude a...
What are copy elision and return value optimization?
... Thing {
public:
Thing();
~Thing();
Thing(const Thing&);
};
void foo(Thing t);
foo(Thing());
or when an exception is thrown and caught by value:
struct Thing{
Thing();
Thing(const Thing&);
};
void foo() {
Thing c;
throw c;
}
int main() {
try {
foo();
}
catch(Thi...
how to check the jdk version used to compile a .class file [duplicate]
...the ".class" in the command otherwise I got a message, "Error: Cannot find foo.class". So doing, "javap -verbose foo | grep "major"" worked. Just a heads up. stackoverflow.com/questions/13356811/…
– Kyle Bridenstine
Dec 1 '15 at 19:21
...
Hibernate lazy-load application design
...osing session context in my own application caches. Typical case:
object foo is loaded and put into a map;
another thread takes this object from the map and calls foo.getBar() (something that was never called before and is lazy evaluated);
boom!
So, to address this we have a number of rules:
w...
how perform grep operation on all files in a directory
... to do multiple commands, you could use:
for I in `ls *.sql`
do
grep "foo" $I >> foo.log
grep "bar" $I >> bar.log
done
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