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Run a callback only if an attribute has changed in Rails
I have the following association in my app:
3 Answers
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Recommended way to save uploaded files in a servlet application
... world code there are circumstances where storing uploaded files in the webapp's deploy folder will not work at all. Some servers do (either by default or by configuration) not expand the deployed WAR file into the local disk file system, but instead fully in the memory. You can't create new files i...
How to generate keyboard events in Python?
...__name__ == "__main__":
AltTab()
hexKeyCode is the virtual keyboard mapping as defined by the Windows API. The list of codes is available on MSDN: Virtual-Key Codes (Windows)
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Convert PDF to clean SVG? [closed]
...hs, too. I also find that they often lose the font data, but don't seem to approximate a good, installed font. How does PDF display it if SVG can't?
– DanRedux
Apr 23 '12 at 21:30
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How to save an activity state using save instance state?
...ing on the Android SDK platform, and it is a little unclear how to save an application's state. So given this minor re-tooling of the 'Hello, Android' example:
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UITextView that expands to text using auto layout
...ODE 11/ iOS13, set constraint constant when text view value set in viewWillAppear and update in textViewDidChange.
– ptc
Feb 7 at 5:30
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Is there a replacement for unistd.h for Windows (Visual C)?
...or Windows, they probably don't work for sockets. You need to look at your app and consider whether to call e.g. closesocket(). */
#ifdef _WIN64
#define ssize_t __int64
#else
#define ssize_t long
#endif
#define STDIN_FILENO 0
#define STDOUT_FILENO 1
#define STDERR_FILENO 2
/* should be in some equ...
Add swipe to delete UITableViewCell
I am making a CheckList application with a UITableView . I was wondering how to add a swipe to delete a UITableViewCell .
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Importing from a relative path in Python
... list of paths python looks at to import things):
import sys, os
sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'Common'))
import Common
os.path.dirname(__file__) just gives you the directory that your current python file is in, and then we navigate to 'Common/' the directory and i...
python requests file upload
...ote the filename="file.txt" parameter.
You can use a tuple for the files mapping value, with between 2 and 4 elements, if you need more control. The first element is the filename, followed by the contents, and an optional content-type header value and an optional mapping of additional headers:
fil...