def snake_to_camel(field_name: str) -> str:
    """Convert snake_case to camelCase"""
    words = field_name.split('_')
    if len(words) < 2:
        return field_name
    first_word = words[0]
    other_words = words[1:]
    return first_word + ''.join(word.capitalize() for word in other_words)