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