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Equivalent of .try() for a hash to avoid “undefined method” errors on nil? [duplicate]
...in C#, Groovy, and
Swift, is introduced to ease nil handling as obj&.foo. Array#dig and
Hash#dig are also added.
This means as of 2.3 below code
account.try(:owner).try(:address)
can be rewritten to
account&.owner&.address
However, one should be careful that & is not a dr...
What is the purpose of the “role” attribute in HTML?
...ers will apply the first recognized role in the token list.
<span role="foo link note bar">...</a>
Out of the list, only link and note are valid roles, and so the link role will be applied in the platform accessibility API because it comes first. If you use custom roles, make sure they ...
Classes vs. Modules in VB.NET
...teger) As Boolean
...
End Function
End Module
Class SomeClass
Sub Foo()
Dim hr = CallSomeHrMethod()
if Succeeded(hr) then
..
End If
End Sub
End Class
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In Java 8 how do I transform a Map to another Map using a lambda?
...<String, Column> original = new HashMap<>();
original.put("foo", new Column());
original.put("bar", new Column());
Map<String, Column> copy = original.entrySet()
.stream()
.collect(Collectors.toMap(Map.Entry::getKey,
e ...
Path.Combine for URLs?
.... Request.ApplicationPath is '/' if your application is at the root, but '/foo' if it's not.
– nickd
Mar 25 '11 at 16:44
24
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Activate a virtualenv via fabric as deploy user
...ualenv
>>> with virtualenv('/home/me/venv/'):
... run('python foo')
fabric-virtualenv makes use of fabric.context_managers.prefix, which might be a good way :)
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jQuery - Detect value change on hidden input field
...ss an element to the function to start tracking
trackChange( $("input[name=foo]")[0] );
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How do I move a redis database from one server to another?
...directly to Redis-2 from Redis-1, use ssh port binding:
ssh user@redis-2.foo.com -L 1234:127.0.0.1:6379
A small script to loop all the keys using KEYS and MIGRATE each key. This is Perl, but hopefully you get the idea:
foreach ( $redis_from->keys('*') ) {
$redis_from->migrate(
...
MISCONF Redis is configured to save RDB snapshots
During writes to Redis ( SET foo bar ) I am getting the following error:
31 Answers
...
How to set environment variable for everyone under my linux system?
...installed file is entirely commented out, and if I add something like echo foo>/home/me/bar and reboot (and log in again), that file doesn't get created. (There's probably a more elegant way to test this, but I wanted to be sure before commenting here.)
– Michael Scheper
...