Question

I have the following mysql query working well. Quick backstory, this lists our customers by total money spent.

SELECT  SUM(price) AS money_spent, co.customer_id, cu.first_name, cu.last_name, cu.email_primary
FROM customer_order AS co 
JOIN customer AS cu ON (cu.customer_id = co.customer_id) 
GROUP BY co.customer_id
ORDER BY money_spent DESC

I attempted moving this to the customer model, as a scope, and subclass yet I failed both ways. I’m somewhat new to rails (formerly client-side) but I think I’m close. Hoping y’all could point me in the right direction. Thanks in advance!!!

def self.high_rollers  
  options = {
      :select   => "SUM(price) AS money_spent, co.customer_id, cu.first_name, cu.last_name, cu.email_primary",
      :from     => "customer_order AS co",
      :joins    => "customer AS cu ON (cu.customer_id = co.customer_id)",
      :group_by => "co.customer_id",
      :order    => "money_spent DESC"
            }   

Putting the following code in my index action for this controller works, but definitely doesn’t feel like the right approach!

@high_bidders = Customer.find_by_sql(<<-SQL
       SELECT  SUM(price) AS money_spent, co.customer_id, cu.first_name, cu.last_name, cu.email_primary
       FROM customer_order AS co 
       JOIN customer AS cu ON (cu.customer_id = co.customer_id) 
       GROUP BY co.customer_id
       ORDER BY money_spent DESC

SQL
)

Answer 1

I assume your model names are Customer and CustomerOrder. Your table names aren’t conventional, I think you already explicitly set table names in models with self.table_name.

class CustomerOrder < ActiveRecord::Base
  # ...
  belongs_to :customer

  scope :high_rollers, select("*, SUM(price) AS money_spent").
                       joins(:customer).
                       group(:customer_id).
                       order("money_spent DESC")
end