[Rails] How to update my satisfaction and no.of reviews coloumn in my table 1 coloumn

I am totally newbie in the rails and I have searched for my problem to solve it then I found an example from here. Comming to my problem I have two databases they are

one looks like as follows "Names" table

 s.no       name       place    satisfactionscore   no.ofratings   rank     1          raj         usa             2          ravi        usa

And I user_ratings table looks like

   id      user_id      names_id     R1    R2     R3    R4   R5        1         1               1       2     3    4           2         2               1             4             5         3         3               2        2     3    3       3   3   

Now I am trying to find the satisfaction score immediately after updating the values. and no.of ratings My formula is for finding is satisfaction score is

  attribute score[ (sum(r1)/no.of rating for r1) + (sum(r2)/no.of rating for r2)+(sum(r3)/no.of rating for r3)+..+(sum(r5)/no.of rating for r5)]     Where the total no.of ratings is (sum(no.of ratings for r1+ r2+ r3+..+r5))    For satisfaction score (attribute score/ total.no.of ratings)

So how can I find the statisfaction score.

I have kept in my ratings model as

after_create :update_post_average_rating    def update_post_average_rating      self.name.update_average_rating    end

and in my names model as

def update_average_rating      update_attributes(:satisfaction => self.ratings.average(:ratings))    end        Can any one tell me how to do this. I am unable to understand how can I do it.

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