establish_connection causes ActiveRecord::StatementInvalid: SQLite3::BusyException: database is locked

In Rails 2.3.8

With the configuration below (and rails project attached)

Second.create fails with Sqlite3::BusyException.

Removing establish_connection, it will work again.

/////////////// MODELS

class First < ActiveRecord::Base
establish_connection :development

belongs_to :second end

class Second < ActiveRecord::Base
has_one :first, :dependent => :destroy establish_connection :development

def before_validation_on_create

build_first

end end

////////////////// WITH MIGRATIONS

lass CreateFirsts < ActiveRecord::Migration
def self.up

create_table :firsts, :id => false do |t|

  t.references :second
  t.timestamps
end

end

def self.down

drop_table :firsts

end end
class CreateSeconds < ActiveRecord::Migration
def self.up

create_table :seconds do |t|

  t.timestamps
end

end

def self.down

drop_table :seconds

end end