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How do you write a migration to rename an ActiveRecord model and its table in Rails?
... tries to effect something that no longer exists. Best trash the whole database and start again if you can't roll back. So be aware you might need to back something up.
Also: check schema_db for any relevant column names in other tables defined by a has_ or belongs_to or something. You'll probably ...
Why is “while ( !feof (file) )” always wrong?
...
64
No it's not always wrong. If your loop condition is "while we haven't tried to read past end of...
Is there an alternative sleep function in C to milliseconds?
...s defined usleep(), so this is available on Linux:
int usleep(useconds_t usec);
DESCRIPTION
The usleep() function suspends execution of the calling thread for
(at least) usec microseconds. The sleep may be lengthened slightly by
any system activity or by the tim...
Modifying the “Path to executable” of a windows service
...isplays output similar to:
[SC] QueryServiceConfig SUCCESS
SERVICE_NAME: ServiceName
TYPE : 10 WIN32_OWN_PROCESS
START_TYPE : 2 AUTO_START
ERROR_CONTROL : 1 NORMAL
BINARY_PATH_NAME : C:\Services\ServiceName
LOAD_ORDER_GROUP :
TAG ...
UITableView load more when scrolling to bottom like Facebook application
...sBatchOfItems = try MyDataHelper.findRange(start..<end)
} catch _ {
print("query failed")
}
// update UITableView with new batch of items on main thread after query finishes
DispatchQueue.main.async {
if let newItems = thisBatchOfItems {
...
Modular multiplicative inverse function in Python
...
If you happen to be using sympy, then x, _, g = sympy.numbers.igcdex(a, m) does the trick.
– Lynn
Sep 16 '16 at 18:15
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In Java, how do I parse XML as a String instead of a file?
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I have this function in my code base, this should work for you.
public static Document loadXMLFromString(String xml) throws Exception
{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocu...
How to resize an image with OpenCV2.0 and Python2.6
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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How do I create a link using javascript?
...answered Jan 23 '11 at 8:50
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Check whether a path is valid in Python without creating a file at the path's target
...
tl;dr
Call the is_path_exists_or_creatable() function defined below.
Strictly Python 3. That's just how we roll.
A Tale of Two Questions
The question of "How do I test pathname validity and, for valid pathnames, the existence or writabilit...