大约有 580 项符合查询结果（耗时：0.0097秒） [XML]
How to define custom configuration variables in rails
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This works in rails 3.1:
in config/environment.rb (or in config/environments/.. to target a specific environment) :
YourApp::Application.config.yourKey = 'foo'
This will be accessible in controller or views like this:
YourApp::Applicati...
How do I find the location of Python module sources?
...mp package is deprecated (since version 3.4) in favor of importlib (since 3.1) docs.python.org/3.6/library/imp.html
– michael
Sep 16 '18 at 3:53
How to change the type of a field?
...e to array instead of double to string. My actual data was in this format :3.1 whereas simone code is working fine for me
– Pankaj Khurana
Apr 9 '14 at 9:30
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How can I open multiple files using “with open” in Python?
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As of Python 2.7 (or 3.1 respectively) you can write
with open('a', 'w') as a, open('b', 'w') as b:
do_something()
In earlier versions of Python, you can sometimes use
contextlib.nested() to nest context managers. This won't work as expe...
Error type 3 Error: Activity class {} does not exist
... This is the only thing that worked for me with Android Studio 3.1 Canary 7.
– NOTiFY
Jan 11 '18 at 14:00
3
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Does Python have an ordered set?
...signing them None), then one has essentially an ordered set.
As of Python 3.1 there is collections.OrderedDict. The following is an example implementation of an OrderedSet. (Note that only few methods need to be defined or overridden: collections.OrderedDict and collections.MutableSet do the heavy ...
How to recognize swipe in all 4 directions
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Apple Swift version 3.1 - Xcode Version 8.3 (8E162)
The handy way from Alexandre Cassagne's approach
let directions: [UISwipeGestureRecognizerDirection] = [.up, .down, .right, .left]
for direction in directions {
let gesture = UISwipeGestu...
Android studio using > 100% CPU at all times - no background processes appear to be running
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Power save mode is still available in Android Studio 3.1 and has been improved since earlier versions.
– muneikh
Jul 9 '18 at 13:18
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Create subdomains on the fly with .htaccess (PHP)
...ory hashing, etc.
For example, the line:
VirtualDocumentRoot /http/users/%3.1/%3.2/%3
would tell Apache to set the document root to /http/users/s/u/subdomain when requested for subdomain.yourdomain.c
Determine what attributes were changed in Rails after_save callback?
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The "selected" answer didn't work for me. I'm using rails 3.1 with CouchRest::Model (based on Active Model). The _changed? methods don't return true for changed attributes in the after_update hook, only in the before_update hook. I was able to get it to work using the (new?) around_...