Initialization.rb

Sunspot.session = CoreShardingSessionProxy.new(Sunspot.config)

# Causes error
# /Users/bcrouse/.rvm/gems/ruby-1.9.2-p0@solr_plexus/gems/sunspot-1.2.1/lib/sunspot/session_proxy/abstract_session_proxy.rb:21:in `config': Sunspot::SessionProxy::ShardingSessionProxy does not support :config (Sunspot::SessionProxy::NotSupportedError)

SessionProxy.rb

class CoreShardingSessionProxy < Sunspot::SessionProxy::ClassShardingSessionProxy
  def initialize(*)
    super

    @core_sessions = Site.all.inject({}) do |sessions, site|
      session = Sunspot::Session.new
      session.config.solr.url = "http://localhost:8983/solr/#{site.core_name}"

      sessions[site.id] = session
      sessions
    end
  end

  def session_for_class(klass)
    @core_sessions[klass.site_id] # Simplified to get the idea
  end
end