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# File 'lib/composite_primary_keys/relation/batches.rb', line 4
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.reorder(batch_order).limit(batch_size)
records = self.primary_key.reduce(relation) do |rel, key|
rel.where(table[key].gteq(start))
end.all
while records.any?
records_size = records.size
primary_key_offset = records.last.id
yield records
break if records_size < batch_size
if primary_key_offset
query = prefixes(primary_key.zip(primary_key_offset)).map do |kvs|
and_clause = kvs.each_with_index.map do |(k, v), i|
if i == kvs.length - 1
table[k].gt(v)
else
table[k].eq(v)
end
end.reduce(:and)
Arel::Nodes::Grouping.new(and_clause)
end.reduce(:or)
records = relation.where(query)
else
raise "Primary key not included in the custom select clause"
end
end
end
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