49 lines
1.8 KiB
Ruby
49 lines
1.8 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 RemoveAssigneeIdFromIssue < 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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# When a migration requires downtime you **must** uncomment the following
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# constant and define a short and easy to understand explanation as to why the
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# migration requires downtime.
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# DOWNTIME_REASON = ''
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# When using the methods "add_concurrent_index", "remove_concurrent_index" or
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# "add_column_with_default" you must disable the use of transactions
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# as these methods can not run in an existing transaction.
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# When using "add_concurrent_index" or "remove_concurrent_index" methods make sure
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# that either of them is the _only_ method called in the migration,
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# any other changes should go in a separate migration.
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# This ensures that upon failure _only_ the index creation or removing fails
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# and can be retried or reverted easily.
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#
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# To disable transactions uncomment the following line and remove these
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# comments:
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disable_ddl_transaction!
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class Issue < ActiveRecord::Base
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self.table_name = 'issues'
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include ::EachBatch
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end
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def up
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remove_column :issues, :assignee_id
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end
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def down
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add_column :issues, :assignee_id, :integer
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add_concurrent_index :issues, :assignee_id
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update_value = Arel.sql('(SELECT user_id FROM issue_assignees WHERE issue_assignees.issue_id = issues.id LIMIT 1)')
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# This is only used in the down step, so we can ignore the RuboCop warning
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# about large tables, as this is very unlikely to be run on GitLab.com
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update_column_in_batches(:issues, :assignee_id, update_value) # rubocop:disable Migration/UpdateLargeTable
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end
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end
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