ArUnion

Patch to ActiveRecord::Relation allowing for unioned scopes.

If you have a sharded DB, beware of use on cross-shard queries.

Installation

Add this line to your application's Gemfile:

gem 'ar_union'

And then execute:

$ bundle

Or install it yourself as:

$ gem install ar_union

Usage

Used to create union SQL call scope that can chained

$ User.scope_on_user.union(
  :other_scope_on_user, :one_more_scope_on_user
).where(foo: "bar").pluck(:foo)

Note: this does not return the results in any guaranteed order. If anybody knows how to maintain the order of the scopes being unioned, open or a PR or ping me and I'd be happy to add another method.

Contributing

  1. Fork it ( https://github.com/[my-github-username]/ar_union/fork )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request