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How to split a string in shell and get the last field
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And how does one keep the part before the last separator? Apparently by using ${foo%:*}. # - from beginning; % - from end. #, % - shortest match; ##, %% - longest match.
– Mihai Danila
Jul 9 '14 at 1...
belongs_to through associations
...unique index to the table (especially because validates_uniqueness_of is prone to race conditions).
If you're paranoid, add a custom validation to Choice that confirms that the answer's question_id matches, but it sounds like the end user should never be given the opportunity to submit data that wo...
How to properly create an SVN tag from trunk?
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I marked this as answer. Just one extra note. You can get an previous revision of the trunk and "tag" it as well. the command: svn copy -r 123 "svn.example.com/project/trunk" "svn.example.com/project/tags/1.0" -m "Tagging, but using older re...
Merge/flatten an array of arrays
... var merged = [].concat.apply([], arrays); seems to work fine to get it on one line. edit: as Nikita's answer already shows.
– Sean
Mar 15 '13 at 16:37
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How to change the style of the title attribute inside an anchor tag?
...do it:
a.tip {
border-bottom: 1px dashed;
text-decoration: none
}
a.tip:hover {
cursor: help;
position: relative
}
a.tip span {
display: none
}
a.tip:hover span {
border: #c0c0c0 1px dotted;
padding: 5px 20px 5px 5px;
display: block;
z-index: 1...
What's the role of adapters in Android?
...lass ArrayAdapter<T> extends BaseAdapter implements Filterable {
// One of the constructors
public ArrayAdapter(Context context, int resource, int textViewResourceId, T[] objects) {
init(context, resource, textViewResourceId, Arrays.asList(objects));
}
void manyMoreMethods(){}
}
Lets...
Hibernate, @SequenceGenerator and allocationSize
... when using @SequenceGenerator - it increases real database sequence by one , multiple this value by 50 (default allocationSize value) - and then uses this value as entity ID.
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Html.Partial vs Html.RenderPartial & Html.Action vs Html.RenderAction
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In the snippet above, both calls will yield the same result.
While one can store the output of Html.Partial in a variable or return it from a method, one cannot do this with Html.RenderPartial.
The result will be written to the Response stream during execution/evaluation.
This also appl...
“Unknown class in Interface Builder file” error at runtime
...t really need to add a _keepAtLinkTime method. Simply calling an existing one, such as:
[MyClass class];
does the trick (as long as you derive from an NSObject).
Of course, you can call this in any location of your code. I guess it could even be in unreachable code. The idea is to fool the...
How to have the cp command create any necessary folders for copying a file to a destination [duplica
... to create a single directory in an existing hierarchy, rsync can do it in one operation. I'm quite a fan of rsync as a much more versatile cp replacement, in fact:
rsync -a myfile /foo/bar/ # works if /foo exists but /foo/bar doesn't. bar is created.
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