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Rails: where does the infamous “current_user” come from?
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It is defined by several gems, e.g. Devise
You'll need to store the user_id somewhere, usually in the session after logging in. It also assumes your app has and needs users, authentication, etc.
Typically, it's something like:
class ApplicationController < ActionController::Base
def current...
Difference between this and self in self-type annotations?
...of this is the same as the type of C.this. (Scala Ref. §6.5)
So, if you call your self-type foo, you could still refer to it as this (unless, of course, you are in an inner template in which case this will refer to the object defined by it – and unless you don’t give the inner template’s se...
Differences between utf8 and latin1
...o at least 5.5 or go for another RDBMS like PostgreSQL. In MySQL 5.5+ it's called utf8mb4.
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differences between 2 JUnit Assert classes
...ed junit.framework.Assert itself and your test class gained the ability to call the assert methods this way.
Since version 4 of JUnit, the framework uses Annotations for marking tests. So you no longer need to extend TestCase. But that means, the assert methods aren't available. But you can make a ...
How can I define a composite primary key in SQL?
... (from that table). If a primary key consists of two or more columns it is called a composite primary key. It is defined as follows:
CREATE TABLE voting (
QuestionID NUMERIC,
MemberID NUMERIC,
PRIMARY KEY (QuestionID, MemberID)
);
The pair (QuestionID,MemberID) must then be unique for the t...
jQuery empty() vs remove()
...ifference between empty() and remove() methods in jQuery , and when we call any of these methods, the objects being created will be destroyed and memory released?
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How to change color in circular progress bar?
I am using circular progress bar on Android. I wish to change the color of this. I am using
22 Answers
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How to detect online/offline event cross-browser?
..., and Firefox (since version 41) will detect when you go "offline" automatically - meaning that "online" events and properties will fire automatically when you unplug your network cable.
Mozilla Firefox (before version 41), Opera, and IE take a different approach, and consider you "online" unless yo...
Running a cron job at 2:30 AM everyday
...function_name
The first part is for setting cron job and the next part to call your function.
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Installing Apple's Network Link Conditioner Tool
...erences.
For versions older than Xcode 8, the package to be downloaded is called Hardware IO Tools for Xcode. Get it from this page
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