code: def resolve_foreign_objects(object, map)
        object.foreign_objects.each do |property|
          value = object[property]
          if value.present?
            foreign_object = ForeignObject.new(value)
            resolve_foreign_keys(foreign_object, map)
            document = connection.find(foreign_object.to_h)
  
            if document
              object["#{property}_id"] = document['_id']
            else
              raise Errors::MissingDatabaseIdError, "couldn't resolve foreign object: #{property} #{value}"
            end
          end
        end
      end
docs: Resolves an object's foreign objects to database IDs.
  
   @param [Object] object an object
   @param [Hash] a map from object ID to database ID
   @raises [Pupa::Errors::MissingDatabaseIdError] if a foreign object cannot
     be resolved