71 lines
2.2 KiB
Ruby
71 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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class DedupIssueMetrics < ActiveRecord::Migration[6.0]
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include Gitlab::Database::MigrationHelpers
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DOWNTIME = false
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TMP_INDEX_NAME = 'tmp_unique_issue_metrics_by_issue_id'
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OLD_INDEX_NAME = 'index_issue_metrics'
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INDEX_NAME = 'index_unique_issue_metrics_issue_id'
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BATCH_SIZE = 1_000
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disable_ddl_transaction!
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class IssueMetrics < ActiveRecord::Base
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self.table_name = 'issue_metrics'
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include EachBatch
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end
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def up
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IssueMetrics.reset_column_information
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last_metrics_record_id = IssueMetrics.maximum(:id) || 0
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# This index will disallow further duplicates while we're deduplicating the data.
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add_concurrent_index(:issue_metrics, :issue_id, where: "id > #{Integer(last_metrics_record_id)}", unique: true, name: TMP_INDEX_NAME)
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IssueMetrics.each_batch(of: BATCH_SIZE) do |relation|
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duplicated_issue_ids = IssueMetrics
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.where(issue_id: relation.select(:issue_id))
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.select(:issue_id)
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.group(:issue_id)
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.having('COUNT(issue_metrics.issue_id) > 1')
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.pluck(:issue_id)
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duplicated_issue_ids.each do |issue_id|
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deduplicate_item(issue_id)
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end
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end
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add_concurrent_index(:issue_metrics, :issue_id, unique: true, name: INDEX_NAME)
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remove_concurrent_index_by_name(:issue_metrics, TMP_INDEX_NAME)
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remove_concurrent_index_by_name(:issue_metrics, OLD_INDEX_NAME)
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end
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def down
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add_concurrent_index(:issue_metrics, :issue_id, name: OLD_INDEX_NAME)
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remove_concurrent_index_by_name(:issue_metrics, TMP_INDEX_NAME)
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remove_concurrent_index_by_name(:issue_metrics, INDEX_NAME)
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end
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private
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def deduplicate_item(issue_id)
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issue_metrics_records = IssueMetrics.where(issue_id: issue_id).order(updated_at: :asc).to_a
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attributes = {}
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issue_metrics_records.each do |issue_metrics_record|
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params = issue_metrics_record.attributes.except('id')
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attributes.merge!(params.compact)
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end
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ActiveRecord::Base.transaction do
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record_to_keep = issue_metrics_records.pop
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records_to_delete = issue_metrics_records
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IssueMetrics.where(id: records_to_delete.map(&:id)).delete_all
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record_to_keep.update!(attributes)
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end
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end
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end
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