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CKEditor instance already exists
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The "true" options makes all the difference. It is also worth mentioning that the "CKEDITOR.remove(instance)" answer given below is not a good solution as it is an internal API that can also produce errors, it is always better to use instance.destroy...
In Django, how do I check if a user is in a certain group?
...add(group) # user is now in the "Editor" group
then user.groups.all() returns [<Group: Editor>].
Alternatively, and more directly, you can check if a a user is in a group by:
if django_user.groups.filter(name = groupname).exists():
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Note that groupname can also be the ac...
CMake output/build directory
...order to make a program for 3 different compilers. This probably concludes all my knowledge in CMake.
5 Answers
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Opacity CSS not working in IE8
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No idea if this still applies to 8, but historically IE doesn't apply several styles to elements that don't "have layout."
see: http://www.satzansatz.de/cssd/onhavinglayout.html
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Can I protect against SQL injection by escaping single-quote and surrounding user input with single-
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First of all, it's just bad practice. Input validation is always necessary, but it's also always iffy.
Worse yet, blacklist validation is always problematic, it's much better to explicitly and strictly define what values/formats you a...
Define all functions in one .R file, call them from another .R file. How, if possible?
How do I call functions defined in abc.R file in another file, say xyz.R?
1 Answer
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Cannot ping AWS EC2 instance
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Thank you, I like this. I just want to allow the ping, not all.
– Chu-Siang Lai
Nov 25 '16 at 11:29
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How to find Unused Amazon EC2 Security groups
...AWS CLI tool, I found an easy way to get what I need:
First, get a list of all security groups
aws ec2 describe-security-groups --query 'SecurityGroups[*].GroupId' --output text | tr '\t' '\n'
Then get all security groups tied to an instance, then piped to sort then uniq:
aws ec2 describe-instance...
Building vs. Compiling (Java)
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The "Build" is a process that covers all the steps required to create a "deliverable" of your software. In the Java world, this typically includes:
Generating sources (sometimes).
Compiling sources.
Compiling test sources.
Executing tests (unit tests, integrat...
@property retain, assign, copy, nonatomic in Objective-C
...gners opted for the safer of the two solutions. In fact nonatomic is generally the better choice as it omits extremely expensive thread locks. The only reason to use atomic is if your property might be set from multiple threads (in which case omitting it can lead to an over-release or a leak).
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