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find() with nil when there are no records
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Yes, just do:
Challenge.find_by_id(10)
For Rails 4 and 5:
Challenge.find_by(id: 10)
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Using Predicate in Swift
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Example how to use in swift 2.0
let dataSource = [
"Domain CheckService",
"IMEI check",
"Compliant about service provider",
"Compliant about TRA",
"Enquires",
"Suggestion",
"SMS Spam",
"Poor Coverage",
"Help Salim"
]
let searchString = "Enq"
let...
Should the folders in a solution match the namespace?
...t the answer is referring to having multiple namespaces in a project which don't map to the folder structure, rather than what I am suggesting which is a project with a single namespace.
In any case while you can't determine which folder a class file is in from the namespace, you can find it by usi...
The function to show current file's full path in mini buffer
...er-file-name that gives you the full path of your file.
The best thing to do is to have your emacs window to always show your system-name and the full path of the buffer you're currently editing :
(setq frame-title-format
(list (format "%s %%S: %%j " (system-name))
'(buffer-file-name...
Can we make unsigned byte in Java
...e in unsigned. The problem is the data I am receiving is unsigned and Java does not support unsigned byte, so when it reads the data it treats it as signed.
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AddBusinessDays and GetBusinessDays
...d Jun 25 '09 at 16:14
Patrick McDonaldPatrick McDonald
57.9k1313 gold badges9494 silver badges115115 bronze badges
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How to run test methods in specific order in JUnit4?
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I think it's quite important feature for JUnit, if author of JUnit doesn't want the order feature, why?
I'm not sure there is a clean way to do this with JUnit, to my knowledge JUnit assumes that all tests can be performed in an arbitrary order. From the FAQ:
How do I use a test fixtu...
Renaming table in rails
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You would typically do this sort of thing in a migration:
class RenameFoo < ActiveRecord::Migration
def self.up
rename_table :foo, :bar
end
def self.down
rename_table :bar, :foo
end
end
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Correct owner/group/permissions for Apache 2 site files/folders under Mac OS X?
...nt)
chmod go+x DIR (to allow "users" including _www to "enter" the dir)
sudo chgrp -R _www ~/my/web/root (all web content is now group _www)
chmod -R go-rwx ~/my/web/root (nobody other than owner can access web content)
chmod -R g+rx ~/my/web/root (all web content is now readable/executable/enterab...
How to list imported modules?
... Or you could find the intersection of sys.modules with globals, and do no type testing at all.
– Marcin
Oct 15 '13 at 15:15
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