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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 MergeRequestsAuthorIdForeignKey < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
disable_ddl_transaction!
class MergeRequest < ActiveRecord::Base
include EachBatch
self.table_name = 'merge_requests'
def self.with_orphaned_authors
where('NOT EXISTS (SELECT true FROM users WHERE merge_requests.author_id = users.id)')
.where('author_id IS NOT NULL')
end
end
def up
# Replacing the ghost user ID logic would be too complex, hence we don't
# redefine the User model here.
ghost_id = User.select(:id).ghost.id
MergeRequest.with_orphaned_authors.each_batch(of: 100) do |batch|
batch.update_all(author_id: ghost_id)
end
add_concurrent_foreign_key(
:merge_requests,
:users,
column: :author_id,
on_delete: :nullify
)
end
def down
remove_foreign_key(:merge_requests, column: :author_id)
end
end
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