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Rails: select unique values from a column
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454
Model.select(:rating)
Result of this is a collection of Model objects. Not plain ratings. And...
Simple tool to 'accept theirs' or 'accept mine' on a whole file using git
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5 Answers
5
Active
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Undoing a git rebase
...before reseting with the --hard option).
Suppose the old commit was HEAD@{5} in the ref log:
git reset --hard HEAD@{5}
In Windows, you may need to quote the reference:
git reset --hard "HEAD@{5}"
You can check the history of the candidate old head by just doing a git log HEAD@{5} (Windows: gi...
Hidden features of HTML
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5
There's one major drawback: when a file is saved to disk and accessed using the file: protocol, the browser won't be able to find the resour...
How do I use a PriorityQueue?
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455
Use the constructor overload which takes a Comparator<? super E> comparator and pass in a...
How to apply a function to two columns of Pandas dataframe
...n [49]: df
Out[49]:
0 1
0 1.000000 0.000000
1 -0.494375 0.570994
2 1.000000 0.000000
3 1.876360 -0.229738
4 1.000000 0.000000
In [50]: def f(x):
....: return x[0] + x[1]
....:
In [51]: df.apply(f, axis=1) #passes a Series object, row-wise
Out[51]:
0 1....
Dictionaries and default values
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edited Jan 23 '19 at 5:30
Solomon Ucko
2,42022 gold badges1212 silver badges2727 bronze badges
answ...
What is the difference between the different methods of putting JavaScript code in an ?
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answered Oct 29 '08 at 5:35
cowgodcowgod
8,19644 gold badges3737 silver badges5555 bronze badges
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How to check an Android device is HDPI screen or MDPI screen?
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density = getResources().getDisplayMetrics().density;
// return 0.75 if it's LDPI
// return 1.0 if it's MDPI
// return 1.5 if it's HDPI
// return 2.0 if it's XHDPI
// return 3.0 if it's XXHDPI
// return 4.0 if it's XXXHDPI
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Integer division: How do you produce a double?
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double num = 5;
That avoids a cast. But you'll find that the cast conversions are well-defined. You don't have to guess, just check the JLS. int to double is a widening conversion. From §5.1.2:
Widening primitive conversions do...