.preload using two databases

My Rails 3.2 application uses two different databases. The main os is MySQL and oher is sqlserver DB:

development:
    adapter: mysql2
    encoding: utf8
    database: mydb
    username: myuser
    password: ***
secondbase:
    adapter: sqlserver
    database: anotherbase
    username: anotheruser
    password: ***

      

        
        
        
      

    

I have two related models:

class Account < ActiveRecord::Base
    establish_connection :secondbase
    has_many :docs
end

class Docs < ActiveRecord::Base
    belongs_to :account
end

      

        
        
        
      

    

Since the two models are using the table in two different databases, I assume that I cannot use eager_loading and load related data using join

orincludes

But I think I preload

should still allow me to load data using two queries (instead of N + 1)

However, when trying to use preload

in my controller, it throws an error:

Docs.where(someconditions).preload(:account)

      

        
        
        
      

    

returns

Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'USE [anotherbase]

      

        
        
        
      

    

What can I do to preload account details and avoid N + 1 requests when duplicating documents with some account details in my views?