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44 lines
999 B
44 lines
999 B
# frozen_string_literal: true
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module ActiveRecord
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module Batches
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def pluck_each(*column_names)
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relation = self
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options = column_names.extract_options!
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flatten = column_names.size == 1
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batch_limit = options[:batch_limit] || 1_000
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order = options[:order] || :asc
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column_names.unshift(primary_key)
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relation = relation.reorder(batch_order(order)).limit(batch_limit)
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relation.skip_query_cache!
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batch_relation = relation
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loop do
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batch = batch_relation.pluck(*column_names)
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break if batch.empty?
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primary_key_offset = batch.last[0]
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batch.each do |record|
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if flatten
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yield record[1]
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else
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yield record[1..-1]
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end
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end
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break if batch.size < batch_limit
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batch_relation = relation.where(
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predicate_builder[primary_key, primary_key_offset, order == :desc ? :lt : :gt]
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)
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end
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end
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end
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end
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