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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class IssuesUpdatedByIdForeignKey < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
disable_ddl_transaction!
class Issue < ActiveRecord::Base
include EachBatch
self.table_name = 'issues'
def self.with_orphaned_updaters
where('NOT EXISTS (SELECT true FROM users WHERE users.id = issues.updated_by_id)')
.where('updated_by_id IS NOT NULL')
end
end
def up
Issue.with_orphaned_updaters.each_batch(of: 100) do |batch|
batch.update_all(updated_by_id: nil)
end
# This index is only used for foreign keys, and those in turn will always
# specify a value. As such we can add a WHERE condition to make the index
# smaller.
add_concurrent_index(:issues, :updated_by_id, where: 'updated_by_id IS NOT NULL')
add_concurrent_foreign_key(
:issues,
:users,
column: :updated_by_id,
on_delete: :nullify
)
end
def down
remove_foreign_key_without_error(:issues, column: :updated_by_id)
remove_concurrent_index(:issues, :updated_by_id)
end
end
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