Use one Sunspot Solr instance for two Rails apps

[byaku...@gmail.com]

I've asked this question on Stackoverflow already but I'll ask it again here in case there's a larger following.

I have a VPS set up with several Rails apps, two of which are using Sunspot Solr. However, Solr is returning irrelevant results for a given search, and I believe the problem boils down to not having separated Sunspot/Solr to handle two Rails apps.

I have this in one app:

class Article < ActiveRecord::Base
  searchable do
    text :title, :boost => 2.0
    text :body do
      strip_tags(body)
    end
  time :created_at
  end
end

and this in the other:
class Article < ActiveRecord::Base
  searchable do
    text :title, :body
  end
end

My sunspot.yml files are basically identical:

production:
  solr:
    hostname: localhost
    port: 8983
    log_level: WARNING
    path: /solr/default
    solr_home: solr

development:
  solr:
    hostname: localhost
    port: 8982
    log_level: INFO
    path: /solr/development

test:
  solr:
    hostname: localhost
    port: 8981
    log_level: WARNING
    path: /solr/test

Is there a way to have 1 Solr instance index and deliver results for 2 Rails apps? I haven't found much documentation on this so am a bit confused as to how to do this.

Any help is much appreciated. Thanks!