A tiny, very configurable ActiveRecord adapter built for running gh-ost migrations. When not running migrations, it'll stay the heck out of the way.
First, you'll need to install
gh-ost. You can find the latest release here. You can check the allowed version range in the version checker (current range: [>= 1.1.0, < 2]). Once you've got that installed, install the gem!
Add this line to your application's Gemfile:
And then execute:
$ bundle install
Connect with ActiveRecord
Configure your ActiveRecord connection to use
mysql2_ghost as the adapter in whichever environments you'd like to use
For a standard rails project, in
For usage with
DATABASE_URL, only a very tiny modification is necessary. The URL should be like:
mysql2-ghost:// (notice the
- instead of
_). This is because the scheme of a URI must be either alphanumeric or one of [
+] (more details)
You can configure
ghost_adapter with (nearly) all of the arguments allowed
gh-ost in the command line. The arguments are up to date as of
gh-ost version 1.1.0.
Read more about configuration methods in the docs.
Since most database activity isn't a migration, we default to just using the
Mysql2Adapter. No need to be executing a bunch of extra logic per query when you're only getting any value for migrations.
To enable the ghost adapter, you have two options. First (recommended) is to use the provided rails generator:
rails g ghost_adapter:install
This does everything you need. All migrations will run through gh-ost and otherwise the adapter will be ignored.
Alternatively, you can enable (or disable) gh-ost migrations with an environment variable.
GHOST_MIGRATE=1 rake db:...
If you have used the rails generator, you can set the variable to a falsey value and it will override the behavior not to use gh-ost.
- "truthy" values:
[1, t, true, y, yes]
- "falsey" values:
[0, f, false, n, no]
Bug reports and pull requests are welcome on GitHub at https://github.com/wetransfer/ghost_adapter. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct. Please add your name to the CONTRIBUTORS.md
The gem is available as open source under the terms of the Hippocratic License.
Code of Conduct
Everyone interacting in the Ghost Adapter project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.