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rails 3 validation on uniqueness on multiple attributes
I use Rails 3.0.0.beta4
3 Answers
3
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Making a Location object in Android with latitude and longitude values
...new Location("");//provider name is unnecessary
targetLocation.setLatitude(0.0d);//your coords of course
targetLocation.setLongitude(0.0d);
float distanceInMeters = targetLocation.distanceTo(myLocation);
share
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Showing data values on stacked bar chart in ggplot2
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From ggplot 2.2.0 labels can easily be stacked by using position = position_stack(vjust = 0.5) in geom_text.
ggplot(Data, aes(x = Year, y = Frequency, fill = Category, label = Frequency)) +
geom_bar(stat = "identity") +
geom_text(size =...
Git diff against a stash
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answered Oct 6 '11 at 16:50
AmberAmber
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npm: disable postinstall script for package
... Gergo ErdosiGergo Erdosi
34.6k1616 gold badges100100 silver badges9090 bronze badges
2
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How do you delete an ActiveRecord object?
...like
user.destroy
User.find(15).destroy
User.destroy(15)
User.where(age: 20).destroy_all
User.destroy_all(age: 20)
Alternatively you can use delete and delete_all which won't enforce :before_destroy and :after_destroy callbacks or any dependent association options.
User.delete_all(condition: ...
How do I get the last character of a string?
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public static void main(String args[]) {
String string = args[0];
System.out.println("last character: " +
string.substring(string.length() - 1));
}
}
The output of java Test abcdef:
last character: f
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UILabel - Wordwrap text
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302
If you set numberOfLines to 0 (and the label to word wrap), the label will automatically wrap a...
Using boolean values in C
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1081
From best to worse:
Option 1 (C99)
#include <stdbool.h>
Option 2
typedef enum { fal...
How do I make a transparent canvas in html5?
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edited Apr 16 '14 at 1:20
Lee Taylor
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answered ...