mirror of
https://github.com/mastodon/mastodon.git
synced 2024-11-26 22:36:21 +01:00
45 lines
999 B
Ruby
45 lines
999 B
Ruby
# frozen_string_literal: true
|
|
|
|
module ActiveRecord
|
|
module Batches
|
|
def pluck_each(*column_names)
|
|
relation = self
|
|
|
|
options = column_names.extract_options!
|
|
|
|
flatten = column_names.size == 1
|
|
batch_limit = options[:batch_limit] || 1_000
|
|
order = options[:order] || :asc
|
|
|
|
column_names.unshift(primary_key)
|
|
|
|
relation = relation.reorder(batch_order(order)).limit(batch_limit)
|
|
relation.skip_query_cache!
|
|
|
|
batch_relation = relation
|
|
|
|
loop do
|
|
batch = batch_relation.pluck(*column_names)
|
|
|
|
break if batch.empty?
|
|
|
|
primary_key_offset = batch.last[0]
|
|
|
|
batch.each do |record|
|
|
if flatten
|
|
yield record[1]
|
|
else
|
|
yield record[1..-1]
|
|
end
|
|
end
|
|
|
|
break if batch.size < batch_limit
|
|
|
|
batch_relation = relation.where(
|
|
predicate_builder[primary_key, primary_key_offset, order == :desc ? :lt : :gt]
|
|
)
|
|
end
|
|
end
|
|
end
|
|
end
|