Yields each batch of records that was found by the find
options
as an array.
Person.where("age > 21").find_in_batches do |group| sleep(50) # Make sure it doesn't get too crowded in there! group.each { |person| person.party_all_night! } end
If you do not provide a block to find_in_batches, it will return an Enumerator for chaining with other methods:
Person.find_in_batches.with_index do |group, batch| puts "Processing group ##{batch}" group.each(&:recover_from_last_night!) end
To be yielded each record one by one, use find_each instead.
Options
-
:batch_size
- Specifies the size of the batch. Default to 1000. -
:start
- Specifies the starting point for the batch processing.
This is especially useful if you want multiple workers dealing with the
same processing queue. You can make worker 1 handle all the records between
id 0 and 10,000 and worker 2 handle from 10,000 and beyond (by setting the
:start
option on that worker).
# Let's process the next 2000 records Person.find_in_batches(start: 2000, batch_size: 2000) do |group| group.each { |person| person.party_all_night! } end
NOTE: It's not possible to set the order. That is automatically set to ascending on the primary key (âid ASCâ) to make the batch ordering work. This also means that this method only works with integer-based primary keys.
NOTE: You can't set the limit either, that's used to control the batch sizes.
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