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How do I run a Ruby file in a Rails environment?
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#!/usr/bin/env /Users/me/rails_project/script/rails runner
Product.all.each { |p| p.price *= 2 ; p.save! }
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What do
...hat they're subclasses of a generic function type (From) => To, but that's all it says. Um, what? Maybe there's documentation somewhere, but search engines don't handle "names" like "
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Easiest way to pass an AngularJS scope variable from directive to controller?
...est way to pass an AngularJS scope variable from directive to controller? All of the examples that I've seen seem so complex, isn't there a way I can access a controller from a directive, and set one of it's scope variables?
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How can I write a heredoc to a file in Bash script?
...se single quotes:
cat << 'EOF' > /tmp/yourfilehere
The variable $FOO will not be interpreted.
EOF
To pipe the heredoc through a command pipeline:
cat <<'EOF' | sed 's/a/b/'
foo
bar
baz
EOF
Output:
foo
bbr
bbz
... or to write the the heredoc to a file using sudo:
cat <<...
How to expand a list to function arguments in Python [duplicate]
... the documentation as "Unpacking argument lists".
You'd use it like this: foo(*values). There's also one for dictionaries:
d = {'a': 1, 'b': 2}
def foo(a, b):
pass
foo(**d)
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What does the 'u' symbol mean in front of string values? [duplicate]
...on Python 2.
You can create a Unicode string multiple ways:
>>> u'foo'
u'foo'
>>> unicode('foo') # Python 2 only
u'foo'
But the real reason is to represent something like this (translation here):
>>> val = u'Ознакомьтесь с документацией'
>>...
Syntax for a single-line Bash infinite while loop
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while true; do foo; sleep 2; done
By the way, if you type it as a multiline (as you are showing) at the command prompt and then call the history with arrow up, you will get it on a single line, correctly punctuated.
$ while true
> do
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Why is TypedReference behind the scenes? It's so fast and safe… almost magical!
...ecification, the constructs used to implement them under the hood (vararg calling convention, TypedReference type, arglist, refanytype, mkanyref, and refanyval instructions) are perfectly documented in the CLI Specification (ECMA-335) in the Vararg library.
Being defined in the Vararg Library makes ...
What's the “big idea” behind compojure routes?
...ave been using Compojure to write a basic web application. I'm hitting a wall with Compojure's defroutes syntax, though, and I think I need to understand both the "how" and the "why" behind it all.
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How do I parse XML in Python?
...like:
for type_tag in root.findall('bar/type'):
value = type_tag.get('foobar')
print(value)
And similar, usually pretty simple, code patterns.
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