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# rubocop:disable Migration/UpdateLargeTable
# rubocop:disable Migration/UpdateColumnInBatches
class MigrateAssignees < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
# When a migration requires downtime you **must** uncomment the following
# constant and define a short and easy to understand explanation as to why the
# migration requires downtime.
# DOWNTIME_REASON = ''
# When using the methods "add_concurrent_index" or "add_column_with_default"
# you must disable the use of transactions as these methods can not run in an
# existing transaction. When using "add_concurrent_index" make sure that this
# method is the _only_ method called in the migration, any other changes
# should go in a separate migration. This ensures that upon failure _only_ the
# index creation fails and can be retried or reverted easily.
#
# To disable transactions uncomment the following line and remove these
# comments:
disable_ddl_transaction!
def up
# Optimisation: this accounts for most of the invalid assignee IDs on GitLab.com
update_column_in_batches(:issues, :assignee_id, nil) do |table, query|
query.where(table[:assignee_id].eq(0))
end
users = Arel::Table.new(:users)
update_column_in_batches(:issues, :assignee_id, nil) do |table, query|
query.where(table[:assignee_id].not_eq(nil)\
.and(
users.project("true").where(users[:id].eq(table[:assignee_id])).exists.not
))
end
end
def down
end
end
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