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Where should virtualenvs be created?
...se pyenv install Python, then pyenv-virtualenv will be a best practice. If set .python-version file, it can auto activate or deactivate virtual env when you change work folder. Pyenv-virtualenv also put all virtual env into $HOME/.pyenv/versions folder.
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Ruby on Rails Callback, what is difference between :before_save and :before_create?
...E INSERT
after_create
after_save
Update operations have exactly the same set, except read update instead of create everywhere (and UPDATE instead of INSERT).
From this, you can see that validation is carried out before the before_save and before_create callbacks.
The before_save occurs slightly...
Is there such a thing as min-font-size and max-font-size?
...is no CSS property for minimum or maximum font size. Browsers often have a setting for minimum font size, but that’s under the control of the user, not an author.
You can use @media queries to make some CSS settings depending on things like screen or window width. In such settings, you can e.g. s...
C++ const map element access
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I'm using at() with in VS2013 on a project set to use VS2010 toolkit. I thought that meant I wasn't using C++11... But yet it compiles... ??
– thomthom
Dec 7 '13 at 22:27
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You need to use a Theme.AppCompat theme (or descendant) with this activity
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In the code, ant2009 has AppTheme set as the application them which extends from a descendant of Theme.AppCompat. That should work. I had the same problem after upgrading to 5.0 on my device and ended up setting @style/Theme.AppCompat.Light as the theme on my...
How does a debugger work?
...nd locations in the source code. The symbol file information is a separate set of APIs and isn't a core part of the OS as such. On Windows this is through the Debug Interface Access SDK.
If you are debugging a managed environment (.NET, Java, etc.) the process will typically look similar, but the d...
jquery find closest previous sibling with class
...get a distant sibling without having to get all. I had a particularly long set that was too CPU intensive using prevAll().
var category = $('li.current_sub').prev('li.par_cat');
if (category.length == 0){
category = $('li.current_sub').prevUntil('li.par_cat').last().prev();
}
category.show();
T...
Cocoa Core Data efficient way to count entities
...xt *moc
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:[NSEntityDescription entityForName:entityName inManagedObjectContext:moc]];
[request setIncludesSubentities:NO]; //Omit subentities. Default is YES (i.e. include subentities)
NSError *err;
NSUInteger count = [moc ...
Sort rows in data.table in decreasing order on string key `order(-x,v)` gives error on data.table 1.
...rsion 1.9.4. Maybe this was fixed in a recent version.
Also, I suggest the setorder(DT, -x) syntax in keeping with the set* commands like setnames, setkey
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“Cannot update paths and switch to branch at the same time”
...ckout -b option to create a new branch, check it out at the same time and set up tracking in one command.
11 Answers
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