gitlab-org--gitlab-foss/db/migrate/20170928124105_create_fork_networks.rb

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class CreateForkNetworks < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
def up
create_table :fork_networks do |t|
t.references :root_project,
references: :projects,
index: { unique: true }
t.string :deleted_root_project_name
end
add_concurrent_foreign_key :fork_networks, :projects,
column: :root_project_id,
on_delete: :nullify
end
def down
if foreign_keys_for(:fork_networks, :root_project_id).any?
remove_foreign_key :fork_networks, column: :root_project_id
end
drop_table :fork_networks
end
end