def match_urls_to_resources(self, url_values):
        """
        For the list of valid URLs, try and match them up
        to resources in the related_resources attribute.

        Args:
            url_values: A dictionary of keys and URL strings that
                        could be related resources.
        Returns:
            valid_values: The values that are valid
        """
        valid_values = {}
        for resource in self.Meta.related_resources:
            for k, v in url_values.items():
                resource_url = resource.get_resource_url(
                    resource, resource.Meta.base_url)
                if isinstance(v, list):
                    if all([resource_url in i for i in v]):
                        self.set_related_method(resource, v)
                        valid_values[k] = v
                elif resource_url in v:
                    self.set_related_method(resource, v)
                    valid_values[k] = v
        return valid_values
For the list of valid URLs, try and match them up
        to resources in the related_resources attribute.

        Args:
            url_values: A dictionary of keys and URL strings that
                        could be related resources.
        Returns:
            valid_values: The values that are valid