Rails - Nov 2011 - Rails 3 Multiple database with Joins conditions throws exception

My environment: Ruby 1.9.2p290, Rails 3.0.9 and RubyGem 1.8.8

unfortunately I have an issue when come across multiple database.

The situation is this: I have two model connect with two different
database and also establishing association between each other.
database connection specifying in each model, look likes

class Visit < ActiveRecord::Base
self.establish_connection "lab"
belongs_to :patient
end

class Patient < ActiveRecord::Base
self.establish_connection "main"
has_many :visits
end

I got an error when meet following scenario
@visits = Visit.joins(:patient)

Errors: Mysql2::Error: Table ''lab.patients'' doesn''t
exist: SELECT
`visits`.* FROM `visits` INNER JOIN `patients` ON `patients`.`id` IS
NULL

Here ''patients'' table is in ''main'' database
and ''visits'' table in ''lab''
database
I doubt when executing the code, that Rails is considering
''patients''
table is part of ''lab'' database [which holds
''visits'' table].

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