I ended up doing something like this (which is gross).
def link_to_many_organization(lot)
@lot.organizations.map{ |o|
begin
_url = OrganizationUrl.find_by_organization_id(o.org_id).address
rescue
o.name
else
link_to(o.name, _url, :target => '_blank')
end
}.to_sentence.html_safe
end
and the usage:
= link_to_many_organization(@lot)