def find_in_batches(options = {})
relation = self
unless arel.orders.blank? && arel.taken.blank?
ActiveRecord::Base.logger.warn("Scoped order and limit are ignored, it's forced to be batch order and batch size")
end
if (finder_options = options.except(:start, :batch_size)).present?
raise "You can't specify an order, it's forced to be #{batch_order}" if options[:order].present?
raise "You can't specify a limit, it's forced to be the batch_size" if options[:limit].present?
relation = apply_finder_options(finder_options)
end
start = options.delete(:start).to_i
batch_size = options.delete(:batch_size) || 1000
relation = relation.except(:order).order(batch_order).limit(batch_size)
records = relation.where(table[primary_key].gteq(start)).all
while records.any?
yield records
break if records.size < batch_size
if primary_key_offset = records.last.id
records = relation.where(table[primary_key].gt(primary_key_offset)).to_a
else
raise "Primary key not included in the custom select clause"
end
end
end