update achievement after grade changed

But then after grading changed it will also update exp and level, not
efficient.  Anyway, I can change back.

On Wed, Sep 10, 2014 at 8:36 PM, Raymoond Tang <notifications@github.com>
wrote:

> In app/models/user_course.rb:
>
> >
> > +  def update_ach_async
>
> I think it's good to only have one method for others to call for updating
> exp, level and achievement related stuff. Otherwise will be tightly
> coupled.
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/Coursemology/coursemology.org/pull/205/files#r17357813>
> .
>