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Ruby on Rails: How can I revert a migration with rake db:migrate?
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Run the following command
rake db:migrate:down VERSION=<version>
where <version> is the version number of your migration file you want to revert.
eg. if you want to revert a migration with file name 3846656238_create_users.rb
rake db:migrate:down V...
Redirecting from HTTP to HTTPS with PHP
...king on a shopping cart website and I would like to redirect the user to a HTTPS page when he's entering his billing details and maintain the HTTPS connection for the next pages until he logs out.
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How to benchmark efficiency of PHP script
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Try https://github.com/fotuzlab/appgati
It allows to define steps in the code and reports time, memory usage, server load etc between two steps.
Something like:
$appgati->Step('1');
// Do some code ...
$appgat...
Could not execute editor
...hile to track down my problem to one of my plugins.
(specifically, it was https://github.com/ervandew/supertab)
I guess that's the downside to automatically updating all my plugins.
So best advice, disable half your vimrc and plugins. If that doesn't help, the problem's with your other half.
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Building and running app via Gradle and Android Studio is slower than via Eclipse
...cess.
# The setting is particularly useful for tweaking memory settings.
# https://medium.com/google-developers/faster-android-studio-builds-with-dex-in-process-5988ed8aa37e#.krd1mm27v
org.gradle.jvmargs=-Xmx5120m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
# When con...
Add a default value to a column through a migration
...ons, put this in an up block rather than a change block. You can leave the down block empty. It won't revert the table to the original condition but the migration can be rolled back.
– IAmNaN
May 16 '14 at 1:16
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How to add screenshot to READMEs in github repository?
...respective file. See this comment for more details.
Check out an example: https://raw.github.com/altercation/solarized/master/README.md
If you use SVGs then you'll need to set the sanitize attribute to true as well: ?raw=true&sanitize=true. (Thanks @EliSherer)
Also, the documentation on relat...
How can I make an svg scale with its parent container?
...iv>
Here's what is happening in the above sample code:
VIEWBOX
MDN: https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/viewBox
min-x, min-y, width and height
ie: viewbox="0 0 1000 1000"
Viewbox is an important attribute because it basically tells the SVG what size to draw and where...
How do I install Maven with Yum?
...is entry in the /etc/yum.repos.d/epel-apache-maven.repo repo file: baseurl=https://repos.fedorapeople.org/repos/dchen/apache-maven/epel-6/$basearch/
– i_grok
Dec 3 '15 at 16:46
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Looping in a spiral
...(x, y)
x = x + 1
while y < 1
print(x, y)
y = y + 1
//LEFT, LEFT, DOWN, DOWN
while x > -1
print(x, y)
x = x - 1
while y > -1
print(x, y)
y = y - 1
//RIGHT, RIGHT, RIGHT, UP, UP, UP
while x < 2
print(x, y)
x = x + 1
while y < 2
print(x, y)
y = y + 1
//LEFT, LEFT...