46 lines
1.4 KiB
Ruby
46 lines
1.4 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 MergeRequestsSourceProjectIdForeignKey < ActiveRecord::Migration
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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_source_projects
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where('NOT EXISTS (SELECT true FROM projects WHERE merge_requests.source_project_id = projects.id)')
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.where('source_project_id IS NOT NULL')
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end
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end
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def up
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# We need to allow NULL values so we can nullify the column when the source
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# project is removed. We _don't_ want to remove the merge request, instead
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# the application will keep them but close them.
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change_column_null(:merge_requests, :source_project_id, true)
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MergeRequest.with_orphaned_source_projects.each_batch(of: 100) do |batch|
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batch.update_all(source_project_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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:projects,
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column: :source_project_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: :source_project_id)
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change_column_null(:merge_requests, :source_project_id, false)
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end
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end
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