active_record_in_batches.rb

# Snippets taken from:
# https://github.com/rails/rails/blob/fc5dd0b85189811062c85520fd70de8389b55aeb/activerecord/lib/active_record/relation/batches.rb#L201

def in_batches(of: 1000, start: nil, finish: nil, load: false, error_on_ignore: nil)
  relation = self
  # ...
  batch_limit = of  
  # ...
  relation = relation.reorder(batch_order).limit(batch_limit)
  relation = apply_limits(relation, start, finish)
  # ...
end

def batch_order
  arel_attribute(primary_key).asc
end