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class Order < ApplicationRecord | |
belongs_to :customer | |
def totals_by_customer | |
Order.group(:customer).sum(:total) | |
end | |
end | |
class Customer < ApplicationRecord | |
has_many :orders | |
end |
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CREATE TABLE `orders` ( | |
`id` int(11) NOT NULL AUTO_INCREMENT, | |
`customer_id` int(11) DEFAULT NULL, | |
`total` int(11) DEFAULT NULL, | |
); | |
CREATE TABLE `customers` ( | |
`id` int(11) NOT NULL AUTO_INCREMENT | |
); |
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