40 lines
1 KiB
Ruby
40 lines
1 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 MergeRequestsMilestoneIdForeignKey < 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 MergeRequest < ActiveRecord::Base
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include EachBatch
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self.table_name = 'merge_requests'
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def self.with_orphaned_milestones
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where('NOT EXISTS (SELECT true FROM milestones WHERE merge_requests.milestone_id = milestones.id)')
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.where('milestone_id IS NOT NULL')
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end
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end
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def up
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MergeRequest.with_orphaned_milestones.each_batch(of: 100) do |batch|
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batch.update_all(milestone_id: nil)
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end
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add_concurrent_foreign_key(
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:merge_requests,
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:milestones,
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column: :milestone_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(:merge_requests, column: :milestone_id)
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end
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end
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