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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
3
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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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Intent - if activity is running, bring it to front, else start a new one (from notification)
My app has notifications, which - obviously - without any flags, start a new activity every time so I get multiple same activities running on top of each other, which is just wrong.
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Why git can't remember my passphrase under Windows
...erences to PuTTY commands below must be prefixed with the full path to the appropriate executable.)
If you have not done so already, then generate a key hash as instructed at GitHub or as instructed by your Git host.
Again, if you have not already done so, convert your key for use with PuTTY's pagea...
Status bar and navigation bar appear over my view's bounds in iOS 7
I recently downloaded Xcode 5 DP to test my apps in iOS 7. The first thing I noticed and confirmed is that my view's bounds is not always resized to account for the status bar and navigation bar.
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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...
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...
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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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...