53 lines
1.8 KiB
Ruby
53 lines
1.8 KiB
Ruby
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# 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 MigrateAssignees < 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" or "add_column_with_default"
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# you must disable the use of transactions as these methods can not run in an
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# existing transaction. When using "add_concurrent_index" make sure that this
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# method is the _only_ method called in the migration, any other changes
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# should go in a separate migration. This ensures that upon failure _only_ the
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# index creation fails 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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def up
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# Optimisation: this accounts for most of the invalid assignee IDs on GitLab.com
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update_column_in_batches(:issues, :assignee_id, nil) do |table, query|
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query.where(table[:assignee_id].eq(0))
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end
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users = Arel::Table.new(:users)
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update_column_in_batches(:issues, :assignee_id, nil) do |table, query|
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query.where(table[:assignee_id].not_eq(nil)\
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.and(
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users.project("true").where(users[:id].eq(table[:assignee_id])).exists.not
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))
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end
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execute <<-EOF
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INSERT INTO issue_assignees(issue_id, user_id)
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SELECT id, assignee_id FROM issues WHERE assignee_id IS NOT NULL
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EOF
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end
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def down
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execute <<-EOF
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DELETE FROM issue_assignees
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EOF
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end
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end
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