Use pg_backup helpers in custom Capistrano task

[vzamanillo]

I am trying to use the PgBackup::Helpers::Database in a custom Capistrano task

require 'rake'
require 'pg_backup/helpers/database'

include PgBackup::Helpers::Database

namespace :database do
  task :dev_backup do
    on roles(:db) do
      within current_path do
        with rails_env: fetch(:environment) do
          dump_dir = "#{shared_path}/#{fetch(:pg_backup_remote_dump_dir)}"
          backup_file = "#{dump_dir}/dev_database.backup"
          if !test("[ -d #{dump_dir} ]")
            error "Folder '#{dump_dir}' does not exits!"
          else
            with_database_config do |host, db, user, pw|
              ` PGPASSWORD=#{pw} pg_dump --host #{host} --username #{user} --clean --format=c --no-owner --no-acl --exclude-table-data 'table' #{db} > #{backup_file} `
            end
          end
        end
      end
    end
  end
end

but looks like ActiveRecord constant is not loaded

uninitialized constant PgBackup::Helpers::Database::ActiveRecord

any hints about how to resolve this?

Thx.