class TrustyCms::ExtensionMigrator

def get_all_versions
  ActiveRecord::Base.connection.select_values("SELECT version FROM #{schema_migrations_table_name}").
    select { |version| version.starts_with?("#{@extension.extension_name}-")}.
    map { |version| version.sub("#{@extension.extension_name}-", '').to_i }.sort
end