Listing all gems on a private gem server
You can use gem list to list all gems available from a remote gem server:
gem list -r --clear-sources -s 'https://user:password@gemserver.tld/'
This is useful to debug cases where Bundler complains of a gem existing in more than one gem source.
Related cards:
Capistrano 3: Running a command on all servers
This Capistrano task runs a command on all servers.
bundle exec cap production app:run cmd='zgrep -P "..." RAILS_ROOT/log/production.log'
Code
# lib/capistrano/tasks/app.rake
namespace :app do
# Use e.g. to grep logs on al...
When upgrading/downgrading RubyGems and Bundler on a server, you must clear bundled gems
On application servers, gems are usually bundled into the project directory, at a location shared across deployments.
This is usually shared/bundle inside your project's root directory, e.g. /var/www/your-project/shared/bundle/.
If you can't ...
Install a local Gemfile on a remote server
Call with the server's hostname (and user if you have no SSH agent), e.g.
install-gems-remotely my.server.com
# or without agent:
install-gems-remotely me@my.server.com
When you call it from a rails directory, it uploads your `Gemfil...
Decide whether cronjobs should run on one or all servers
Understanding your type of cronjob
Some cronjobs must only run on a single server. E.g. when you run nightly batch operations on the database, it should probably run on a single server. Running it on multip...
Sudo a gem executable does not work on Ubuntu
Today I needed to execute a ruby gem executable with sudo. But, surprisingly, bash would tell me command not found for the gem that ran lovely without sudo.
Gem bins are installed to /var/lib/gems/1.8/bin, which is not in sudo’s PATH....
Distribute files from a private bucket on AWS S3
Given you store files on Amazon S3 and you need to stream those files out to people while you don't want them to be able to distribute the content simply by sharing the S3 URL.
You could either mark the bucket as private and fetch the appropriate...
Handy: A regex that validates all valid email addresses (give or take) - Axon Flux // A Ruby on Rails Blog
/^([\w!#$%&'*+-/=?^`{|}~]+.)*[\w!#$%&'*+-/=?^`{|}~]+@((((([a-z0-9]{1}[a-z0-9-]{0,62}[a-z0-9]{1})|[a-z]).)+[a-z]{2,6})|(\d{1,3}.){3}\d{1,3}(:\d{1,5})?)$/i
How to make changes to a Ruby gem (as a Rails developer)
At makandra, we've built a few gems over the years. Some of these are quite popular: spreewald (> 1M downloads), active_type (> 1M downloads), and geordi (> 200k downloads)
Developing a Ruby gem is different from developing Rails applications, w...
Rails: How to list all validations on a model or an attribute
If a model inherits from others or uses many concerns / traits, it might be hard to see in the code which validators it has.
But fortunately there's a method for that:
irb(main):002:0> pp UserGroup.validators
[#<ActiveModel::Validations::...