Question

I have a car model. (In my database, the cars table has a column named “customer_id“.)

class Car < ActiveRecord::Base
  belongs_to :customer
end

A customer model: (The customer model has a attribute named “customer_name“.)

class Customer < ActiveRecord::Base
  has_many :cars
end

My question is, if I queried the cars table with:

where("id >= ? AND id <= ?", 3, 15) #get some cars

Then I would like to order this result by customer_name ascending order, what’s the ordering code??

I tried both

where("id >= ? AND id <= ?", 3, 15).order("customer_id.customer_name ASC")

and

where("id >= ? AND id <= ?", 3, 15).order("customer.customer_name ASC")

But seems neither of them is working. Any body can help? (I am using Rails 3)

Answer 1

You need to join the custom table for this query to work.

Try

.joins(:customer).where("cars.id >= ? AND cars.id <= ?", 3, 15).order("customers.customer_name ASC")