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Checking for empty queryset in Django
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223
if not orgs:
# Do this...
else:
# Do that...
...
What is Android keystore file, and what is it used for?
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132
The answer I would provide is that a keystore file is to authenticate yourself to anyone who is...
Convert between UIImage and Base64 string
...e64, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)!
Swift 3.0 > Decoding
let dataDecoded : Data = Data(base64Encoded: strBase64, options: .ignoreUnknownCharacters)!
Encoding :
let strBase64 = imageData.base64EncodedString(options: .lineLength64Characters)
print(strBase64)
Decod...
python NameError: global name '__file__' is not defined
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137
This error comes when you append this line os.path.join(os.path.dirname(__file__)) in python in...
Why does PHP 5.2+ disallow abstract static class methods?
...ass's static method
EDIT (Sept. 16th, 2009)
Update on this. Running PHP 5.3, I see abstract static is back, for good or ill. (see http://php.net/lsb for more info)
CORRECTION (by philfreo)
abstract static is still not allowed in PHP 5.3, LSB is related but different.
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Spring MVC: How to return image in @ResponseBody?
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if you are using Spring version of 3.1 or newer you can specify "produces" in @RequestMapping annotation. Example below works for me out of box. No need of register converter or anything else if you have web mvc enabled (@EnableWebMvc).
@ResponseBody
@Request...
How to get value of selected radio button?
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edited Feb 5 '18 at 14:39
answered Apr 5 '13 at 16:50
Jo...
Update Angular model after setting input value with jQuery
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325
ngModel listens for "input" event, so to "fix" your code you'd need to trigger that event afte...
Building and running app via Gradle and Android Studio is slower than via Eclipse
I have a multi-project (~10 modules) of which building takes about 20-30 seconds each time. When I press Run in Android Studio, I have to wait every time to rebuild the app, which is extremely slow.
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Optimise PostgreSQL for fast testing
...memory limit if you increase shared_buffers on PostgreSQL 9.2 and below; 9.3 and above changed how they use shared memory to avoid that.
If you're using a just a couple of connections that do lots of work, increase work_mem to give them more RAM to play with for sorts etc. Beware that too high a wo...