46 lines
1.3 KiB
Ruby
46 lines
1.3 KiB
Ruby
# See http://doc.gitlab.com/ce/development/migration_style_guide.html
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# for more information on how to write migrations for GitLab.
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class IssuesUpdatedByIdForeignKey < ActiveRecord::Migration[4.2]
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include Gitlab::Database::MigrationHelpers
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# Set this constant to true if this migration requires downtime.
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DOWNTIME = false
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disable_ddl_transaction!
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class Issue < ActiveRecord::Base
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include EachBatch
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self.table_name = 'issues'
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def self.with_orphaned_updaters
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where('NOT EXISTS (SELECT true FROM users WHERE users.id = issues.updated_by_id)')
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.where('updated_by_id IS NOT NULL')
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end
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end
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def up
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Issue.with_orphaned_updaters.each_batch(of: 100) do |batch|
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batch.update_all(updated_by_id: nil)
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end
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# This index is only used for foreign keys, and those in turn will always
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# specify a value. As such we can add a WHERE condition to make the index
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# smaller.
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add_concurrent_index(:issues, :updated_by_id, where: 'updated_by_id IS NOT NULL')
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add_concurrent_foreign_key(
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:issues,
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:users,
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column: :updated_by_id,
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on_delete: :nullify
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)
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end
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def down
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remove_foreign_key_without_error(:issues, column: :updated_by_id)
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remove_concurrent_index(:issues, :updated_by_id)
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end
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end
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