many acts_as_readonly's model read one database should use a common connection.

[yakjuly]

all local db model use ActiveRecord::Base.connection.
EX:
class Foo < ActiveRecord::Base
end
class Bar < ActiveRecord::Base
end

Foo.connection.object_id == Bar.connection.object_id

so readonly model also need this.

class Foo < ActiveRecord::Base
acts_as_readonly :other
end

class Bar < ActiveRecord::Base
acts_as_readonly :other
end

Foo.connection.object_id.should == Bar.connection.object_id