Question

How can I write the following default scope:

class SimilarMerchant < ActiveRecord::Base

  # relationships
  belongs_to :merchant
  belongs_to :similar_merchant, :foreign_key => 'similar_merchant_id', :class_name => "Merchant"

  # scopes
  default_scope order('merchants.is_paid DESC').order('score DESC')

end

Basically I want to sort by a merchant.is_paid field (which belongs to a related model)

Any advice?

Answer 1

Try this:

default_scope joins(:merchant).order('merchants.is_paid DESC, score DESC')

And please bear in mind it can be slow, depending on the number of the records