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# Port ActiveRecord::Relation#in_batches from ActiveRecord 5.
# https://github.com/rails/rails/blob/ac027338e4a165273607dccee49a3d38bc836794/activerecord/lib/active_record/relation/batches.rb#L184
# TODO: this can be removed once we're using AR5.
raise "Vendored ActiveRecord 5 code! Delete #{__FILE__}!" if ActiveRecord::VERSION::MAJOR >= 5
module ActiveRecord
module Batches
# Differences from upstream: enumerator support was removed, and custom
# order/limit clauses are ignored without a warning.
def in_batches(of: 1000, start: nil, finish: nil, load: false)
raise "Must provide a block" unless block_given?
relation = self.reorder(batch_order).limit(of)
relation = relation.where(arel_table[primary_key].gteq(start)) if start
relation = relation.where(arel_table[primary_key].lteq(finish)) if finish
batch_relation = relation
loop do
if load
records = batch_relation.records
ids = records.map(&:id)
yielded_relation = self.where(primary_key => ids)
yielded_relation.load_records(records)
else
ids = batch_relation.pluck(primary_key)
yielded_relation = self.where(primary_key => ids)
end
break if ids.empty?
primary_key_offset = ids.last
raise ArgumentError.new("Primary key not included in the custom select clause") unless primary_key_offset
yield yielded_relation
break if ids.length < of
batch_relation = relation.where(arel_table[primary_key].gt(primary_key_offset))
end
end
end
end
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