大约有 3,060 项符合查询结果（耗时：0.0235秒） [XML]
Create Django model or update if exists
...looking for "update if exists else create" use case, please refer to @Zags excellent answer
Django already has a get_or_create, https://docs.djangoproject.com/en/dev/ref/models/querysets/#get-or-create
For you it could be :
id = 'some identifier'
person, created = Person.objects.get_or_create(i...
Check if pull needed in Git
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Excellent. As far as I can tell, this is the only solution that actually checks the origin for updates but doesn't implicitly do a fetch.
– Kyle Strand
Apr 17 '14 at 20:53
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Bootstrap 3 modal vertical position center
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excellent answer and post! However, can this also be animated? It works great when it just pops in, but what about animated? I am at work and can't test it atm, but I am eager to see the results
– scoote...
ListView inside ScrollView is not scrolling on Android
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I found a solution that works excellently and can scroll the ListView without problems:
ListView lv = (ListView)findViewById(R.id.myListView); // your listview inside scrollview
lv.setOnTouchListener(new ListView.OnTouchListener() {
@Override
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Apache Spark: The number of cores vs. the number of executors
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From the excellent resources available at RStudio's Sparklyr package page:
SPARK DEFINITIONS:
It may be useful to provide some simple definitions
for the Spark nomenclature:
Node: A server
Worker Node: A server that is part of the cl...
Custom events in jQuery?
...re and here. Why exactly this can be useful? I found how to use it in this excellent explanation from twitter engineer.
P.S. In plain javascript you can do this with new CustomEvent, but beware of IE and Safari problems.
sh...
iOS Image Orientation has Strange Behavior
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Quick copy/paste Swift translation of Dilip's excellent answer.
import Darwin
class func rotateCameraImageToProperOrientation(imageSource : UIImage, maxResolution : CGFloat) -> UIImage {
let imgRef = imageSource.CGImage;
let width = CGFloat(CGImageGetWidth...
Button Click event fires when pressing Enter key in different input (no forms)
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Excellent fix. I thought browsers would only auto-submit on "Enter" when inside <form> tags. But I see I was wrong.
– Clayton Bell
Jul 3 '13 at 16:38
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raw vs. html_safe vs. h to unescape html
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The difference is between Rails’ html_safe() and raw(). There is an excellent post by Yehuda Katz on this, and it really boils down to this:
def raw(stringish)
stringish.to_s.html_safe
end
Yes, raw() is a wrapper around html_safe() that forces the input to String and then calls html_sa...
Vagrant reverse port forwarding?
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Excellent! ifconfig and ip address weren't getting me what I needed, but netstat -rn did.
– geerlingguy
Jan 14 '19 at 16:59
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