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Order by multiple columns with Doctrine
I need to order data by two columns (when the rows have different values for column number 1, order by it; otherwise, order by column number 2)
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runOnUiThread in fragment
I'm trying to convert an Activity to fragment. The error mark on runOnUiThread .
on the past:
6 Answers
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Why should I implement ICloneable in c#?
Can you explain to me why I should inherit from ICloneable and implement the Clone() method?
4 Answers
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Convert numpy array to tuple
Note: This is asking for the reverse of the usual tuple-to-array conversion.
5 Answers
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How to create a loop in bash that is waiting for a webserver to respond?
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Combining the question with chepner's answer, this worked for me:
until $(curl --output /dev/null --silent --head --fail http://myhost:myport); do
printf '.'
sleep 5
done
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AngularJS validation with no enclosing
Is it possible in Angular to validate a single, isolated <input> in a similar way the forms are validated? I'm thinking about something like this:
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How do I use a file grep comparison inside a bash if/else statement?
When our server comes up we need to check a file to see how the server is configured.
4 Answers
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How to trim leading and trailing white spaces of a string?
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For example,
package main
import (
"fmt"
"strings"
)
func main() {
s := "\t Hello, World\n "
fmt.Printf("%d %q\n", len(s), s)
t := strings.TrimSpace(s)
fmt.Printf("%d %q\n", len(t), t)
}
Output:
16 "\t Hello, World\n "
12 "Hello, World"
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WPF: How to display an image at its original size?
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Here is a similar question. Generally setting Stretch="None" is enough.
It is also very important what DPI has the image set in metadata. It took me quite a while before figuring out that if the image's DPI is different from the monitor's DPI ...
Validate uniqueness of multiple columns
Is there a rails-way way to validate that an actual record is unique and not just a column? For example, a friendship model / table should not be able to have multiple identical records like:
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