tsujigiri

class Location < ActiveRecord::Base
  has_many :foos
  acts_as_mappable default_units: :kms
end

class Foo < ActiveRecord::Base
  belongs_to :location
  acts_as_mappable through: :location
end

tsujigiri

def parse filename, content
  offset = 0
  begin
    FasterCSV.parse(content) do |row|
      # do stuff
      offset += row.to_s.size
    end
  rescue FasterCSV::MalformedCSVError => e
    @file_offset ||= 0
    @file_offset += offset