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Add a reference column migration in Rails 4
...s tables and wish to add a new relationship between them.
All you need to do is: just generate a migration using the following command:
rails g migration AddUserToUploads user:references
Which will create a migration file as:
class AddUserToUploads < ActiveRecord::Migration
def change
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Programmatically get height of navigation bar
...know that the presence of the more view controller (navigation bar) pushes down the UIView by its height. I also know that this height = 44px. I have also discovered that this push down maintains the [self.view].frame.origin.y = 0 .
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What are the respective advantages/limitations of Amazon RDS vs. EC2 with MySQL? [closed]
...In short: EC2 will provide maximum performance if you go with a RAID0 EBS. Doing RAID0 EBS requires a pretty significant amount of maintenance overhead, for example:
http://alestic.com/2009/06/ec2-ebs-raid
http://alestic.com/2009/09/ec2-consistent-snapshot
EC2 without RAID0 EBS will provide crapp...
Do any JVM's JIT compilers generate code that uses vectorized floating point instructions?
...of my Java program really is some tight loops to compute a bunch of vector dot products. Yes I've profiled, yes it's the bottleneck, yes it's significant, yes that's just how the algorithm is, yes I've run Proguard to optimize the byte code, etc.
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What is the proper way to re-throw an exception in C#? [duplicate]
I have a question for you that stems from my partner doing things a different way than I do.
9 Answers
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Efficient string concatenation in C++
...sing.
You could guarantee efficiency and have greater control yourself by doing concatenation manually via c built-in functions.
Why operator+ is not efficient:
Take a look at this interface:
template <class charT, class traits, class Alloc>
basic_string<charT, traits, Alloc>
opera...
Disable Interpolation when Scaling a
NOTE : This has to do with how existing canvas elements are rendered when scaled up , not to do with how lines or graphics are rendered onto a canvas surface . In other words, this has everything to do with interpolation of scaled elements , and nothing to do with antialiasing of graphics b...
From inside of a Docker container, how do I connect to the localhost of the machine?
So I have a Nginx running inside a docker container, I have a mysql running on localhost, I want to connect to the MySql from within my Nginx. The MySql is running on localhost and not exposing a port to the outside world, so its bound on localhost, not bound on the ip address of the machine.
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What Xcode keyboard shortcuts do you use regularly? [closed]
What Xcode keyboard shortcuts do you use regularly?
16 Answers
16
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Disable browser's back button
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Note that making the page un-cacheable does not achieve what the OP wanted: to disable visiting pages using the back button. Even if a browser obeys no-cache when using the back button (which browsers are not obliged to do AFAIK) they still provide a way to reloa...