'Return objects having aliases with a given key or category or
combination of the two.
Args:
key (str, optional): Alias key. Not case sensitive.
category (str, optional): Alias category. Not case sensitive.
Returns:
objects (list): Objects with matching alias.'

def get_by_alias(self, key=None, category=None):

    return self.get_by_tag(key=key, category=category, tagtype='alias')
