Backport of ActiveRecord::QueryMethods::WhereChain#missing for Rails 6.0 and 5.x applications.
rails/rails#34727

Add this line to your application's Gemfile:

gem 'activerecord-missing'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install activerecord-missing

Post.where.missing(:author)
Post.where.missing(:author, :comments)

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/yujideveloper/activerecord-missing.

The gem is available as open source under the terms of the MIT License.