Sharegroups

# models/organization.rb
Class Organization < ActiveRecord::Base

  has_many :sharegroups, :foreign_key => "host_organization_id"
  has_many :inverse_sharegroups, :class_name => "Sharegroup", :foreign_key => "guest_organization_id"
  has_many :direct_organizations, :through => :sharegroups, :source => :guest_organization
  has_many :inverse_organizations, :through => :inverse_sharegroups, :source => :host_organization

  def organizations
    direct_organizations | inverse_organizations
  end

end

# models/sharegroup.rb
class Sharegroup < ActiveRecord::Base
  belongs_to :host_organization, :class_name => "Organization"
  belongs_to :guest_organization, :class_name => "Organization"
end

nevermind. i get it