44 lines
1.1 KiB
Ruby
44 lines
1.1 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 MergeRequestsAuthorIdForeignKey < 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_authors
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where('NOT EXISTS (SELECT true FROM users WHERE merge_requests.author_id = users.id)')
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.where('author_id IS NOT NULL')
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end
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end
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def up
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# Replacing the ghost user ID logic would be too complex, hence we don't
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# redefine the User model here.
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ghost_id = User.select(:id).ghost.id
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MergeRequest.with_orphaned_authors.each_batch(of: 100) do |batch|
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batch.update_all(author_id: ghost_id)
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end
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add_concurrent_foreign_key(
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:merge_requests,
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:users,
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column: :author_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(:merge_requests, column: :author_id)
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end
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end
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