How to save data from model to database (rails)?

Question

Ruby on Rails

Hello, can you please tell me if the data that I calculate in the model can be saved in the database?
I display a table from the database, and along the way in one of the columns I display the data that I consider in the model. The problem is that based on this data, I need to build a chart. The diagram is quietly built on the basis of data from the database, but does not want to take it from the model. How to solve such a problem?

def current_money
    doctor_hour_price.to_f*users.where("enter_date >= ?", 7.days.ago).count
  end

It's not so important what the function does, it's important how to write what it does in the database) View
Model

Answer 1

before_save :set_current_money

def set_current_money
    self.current_money ||= self.doctor_hour_price.to_f*self.users.where("enter_date >= ?", 7.days.ago).count
 end