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Ruby on Rails: how do I sort with two columns using ActiveRecord?
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In Rails 4 you can do something similar to:
Model.order(foo: :asc, bar: :desc)
foo and bar are columns in the db.
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Forward function declarations in a Bash or a Shell script?
...use a pattern like this for most of my scripts:
#!/bin/bash
main() {
foo
bar
baz
}
foo() {
}
bar() {
}
baz() {
}
main "$@"
You can read the code from top to bottom, but it doesn't actually start executing until the last line. By passing "$@" to main() you can access the command-l...
HAProxy redirecting http to https (ssl)
...--------------------
frontend unsecured *:80
redirect location https://foo.bar.com
#---------------------------------------------------------------------
# frontend secured
#---------------------------------------------------------------------
frontend secured *:443
mode tcp
default_bac...
Task not serializable: java.io.NotSerializableException when calling function outside closure only o
...ple of how I did it:
def genMapper(kryoWrapper: KryoSerializationWrapper[(Foo => Bar)])
(foo: Foo) : Bar = {
kryoWrapper.value.apply(foo)
}
val mapper = genMapper(KryoSerializationWrapper(new Blah(abc))) _
rdd.flatMap(mapper).collectAsMap()
object Blah(abc: ABC) extends (Foo ...
What is the maven-shade-plugin used for, and why would you want to relocate Java packages?
...on use cases which involve package renaming.
For example, I am developing Foo library, which depends on a specific version (e.g. 1.0) of Bar library. Assuming I cannot make use of other version of Bar lib (because API change, or other technical issues, etc). If I simply declare Bar:1.0 as Foo's d...
What is the strict aliasing rule?
..., and how to deal with alignment issues through packing structs correctly.
Footnote
1 The types that C 2011 6.5 7 allows an lvalue to access are:
a type compatible with the effective type of the object,
a qualified version of a type compatible with the effective type of the object,
a type that is t...
Copying files from Docker container to host
...image - <<EOF
> FROM busybox
> WORKDIR /workdir
> RUN touch foo.txt bar.txt qux.txt
> EOF
Sending build context to Docker daemon 2.048kB
Step 1/3 : FROM busybox
---> 00f017a8c2a6
Step 2/3 : WORKDIR /workdir
---> Using cache
---> 36151d97f2c9
Step 3/3 : RUN touch foo.tx...
Making 'git log' ignore changes for certain paths
...d empty Git repository in /tmp/tmp.cJm8k38G9y/.git/
$ mkdir aye bee
$ echo foo > aye/foo
$ git add aye/foo
$ git commit -m "First commit"
[master (root-commit) 46a028c] First commit
0 files changed
create mode 100644 aye/foo
$ echo foo > bee/foo
$ git add bee/foo
$ git commit -m "Second comm...
How and why does 'a'['toUpperCase']() in JavaScript work?
...
foo.bar and foo['bar'] are equal so the code you posted is the same as
alert('a'.toUpperCase())
When using foo[bar] (note tha lack of quotes) you do not use the literal name bar but whatever value the variable bar contains...
Resizing an iframe based on content
...as iframed, but never pages in which it is framed, e.g. if you have:
www.foo.com/home.html, which iframes
|-> www.bar.net/framed.html, which iframes
|-> www.foo.com/helper.html
then home.html can communicate with framed.html (iframed) and helper.html (same domain).
Communication o...