使用适配器模式和__slots__优化代码小记

今天看了一篇关于设计模式方面的资料，再加上前几天看的 __slots__ 的用法，想起项目中的更新用户资料相关代码可以用上边的知识（适配器模式， __slots__， __setattr__）优化一下：

修改前：

class UserModel(object):

    def __init__(self, user_id=None):
        self.user_id = user_id
        self.query = Query(_User)
        
    ...
        
	def update_profile(self, avatar=None, nickname=None, birth=None,
	                       mind=None, height=None, weight=None, sexuality=None, emotion=None,
	                       haunt=None, been=None, company=None, position=None, graduated=None,
	                       industry=None, salary=None, hometown=None):
	    u = self.get_by_id()
	    user_profile = UserProflieModel.get_or_create_user_profile(u)
	
	    if avatar is not None:
	        avatar_file = Query(_File).get(avatar)
	        u.set('avatar', avatar_file)
	    if nickname is not None:
	        u.set('nickname', nickname)
	    if birth is not None:
	        birthday = datetime.fromtimestamp(birth)
	        u.set('birthday', birthday)
	    if mind is not None:
	        if len(mind) > 300:
	            raise LeanCloudError(20504, errmsg.ERRMSG[20504])
	        u.set('mind', mind)
	    if height is not None:
	        user_profile.set('height', height)
	    if weight is not None:
	        user_profile.set('weight', weight)
	    if sexuality is not None:
	        user_profile.set('sexuality', sexuality)
	    if emotion is not None:
	        user_profile.set('emotion', emotion)
	    if haunt is not None:
	        user_profile.set('haunt', haunt)
	    if been is not None:
	        user_profile.set('been', been)
	    if company is not None:
	        user_profile.set('company', company)
	    if position is not None:
	        user_profile.set('position', position)
	    if graduated is not None:
	        user_profile.set('graduated', graduated)
	    if industry is not None:
	        user_profile.set('industry', industry)
	    if salary is not None:
	        user_profile.set('salary', salary)
	    if hometown is not None:
	        region = Query(Region).equal_to('adcode', hometown).first()
	        user_profile.set('hometown', region)
	
	    try:
	        u.save()
	        user_profile.save()
	    except LeanCloudError as e:
	        logging.error(e)
	        return False
	    return True

修改后：

class Account(object):
    __slots__ = ('user_id', 'user', 'user_profile', 'account_money')

    def __init__(self, user_id):
        self.user_id = user_id
        self.user = Query(_User).include('avatar.url', 'password').get(user_id)
        self.user_profile = UserProflieModel.get_or_create_user_profile(self.user)
        self.account_money = None

    def __setattr__(self, key, value):
        if key in self.__slots__:
            object.__setattr__(self, key, value)
        elif key in ('height', 'weight', 'sexuality', 'emotion', 'haunt', 'been', 'company',
                     'position', 'graduated', 'industry', 'salary', 'hometown') and value is not None:
            if key == 'hometown':
                value = Query(Region).equal_to('adcode', value).first()
            self.user_profile.set(key, value)
        elif key in ('avatar', 'nickname', 'birth', 'mind') and value is not None:
            if key == 'avatar':
                value = Query(_File).get(value)
            elif key == 'birth':
                value = datetime.fromtimestamp(value/1000)
            elif key == 'mind':
                if len(value) > 300:
                    raise LeanCloudError(20504, errmsg.ERRMSG[20504])
            self.user.set(key, value)

    def save(self):
        self.user.save()
        self.user_profile.save()
        # self.account_money.save()
        
class UserModel(object):

    def __init__(self, user_id=None):
        self.user_id = user_id
        self.query = Query(_User)
        
    ...
    
    def update_profile(self, avatar=None, nickname=None, birth=None,
                       mind=None, height=None, weight=None, sexuality=None, emotion=None,
                       haunt=None, been=None, company=None, position=None, graduated=None,
                       industry=None, salary=None, hometown=None):
        account = Account(self.user_id)
        account.avatar = avatar
        account.nickname = nickname
        account.birth = birth
        account.mind = mind
        account.height = height
        account.weight = weight
        account.sexuality = sexuality
        account.emotion = emotion
        account.haunt = haunt
        account.been = been
        account.company = company
        account.position = position
        account.graduated = graduated
        account.industry = industry
        account.salary = salary
        account.hometown = hometown

        try:
            account.save()
        except LeanCloudError as e:
            logging.error(e)
            return False
        return True

感觉自己萌萌哒 (｡◕∀◕｡)