Rails scope for maintaining order

gistfile1.txt

class Something < ActiveRecrd::Base

  scope :for_ids_with_order, ->(ids) {
    order = sanitize_sql_array(
      ["position(id::text in ?)", ids.join(',')]
    )
    where(:id => ids).order(order)
  }    
end

# usage:
Something.for_ids_with_order([1, 3, 2])