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crespire/batch_pluck.rb

Last active August 13, 2024 19:41
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Pluck in batches
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batch_pluck.rb
# Assuming Rails AR is available
# This should let us pluck stuff from a big collection in batches
# We add the load: true option if we want to load the relaion beforehand.
# Because we are plucking anyway, we don't need to preload
# See: https://github.com/rails/rails/issues/47462
Model.where(some_id: 15).in_batches do |relation|
relation.pluck(:attr1, :attr2).each do |row|
# stuff
end
end
# To set a custom batch size
Model.where(some_id: 15).in_batches(of: 50 do |relation|
relation.pluck(:attr1, :attr2).each do |row|
# stuff
end
end
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