gitlab-org--gitlab-foss/db/migrate/20161130101252_fill_projects_routes_table.rb

# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.

class FillProjectsRoutesTable < ActiveRecord::Migration[4.2]
  include Gitlab::Database::MigrationHelpers

  DOWNTIME = true
  DOWNTIME_REASON = 'No new projects should be created during data copy'

  def up
    if Gitlab::Database.postgresql?
      execute <<-EOF
        INSERT INTO routes (source_id, source_type, path)
        (SELECT DISTINCT ON (namespaces.path, projects.path) projects.id, 'Project', concat(namespaces.path, '/', projects.path)
         FROM projects INNER JOIN namespaces ON projects.namespace_id = namespaces.id
         ORDER BY namespaces.path, projects.path, projects.id DESC)
      EOF
    else
      execute <<-EOF
        INSERT INTO routes (source_id, source_type, path)
        (SELECT projects.id, 'Project', concat(namespaces.path, '/', projects.path)
         FROM projects INNER JOIN namespaces ON projects.namespace_id = namespaces.id)
      EOF
    end
  end

  def down
    execute("DELETE FROM routes WHERE source_type = 'Project'")
  end
end