与日期和瓶平静的问题 [英] issue with dates and flask-restful

查看：204 发布时间：2017/12/11 23:46:50 python python-2.7 flask sqlalchemy flask-restful

本文介绍了与日期和瓶平静的问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

MarshallingException

我试图让瓶子宁静地返回一个datetime字段，：'datetime.date'对象没有属性'utctimetuple'

模型（sqlalchemy）如下：

  class目标（db.Model）：
 id = db.Column（db.Integer，primary_key = True ）
 uuid = db.Column（db.String（256））
 title = db.Column（db.String（80））
 description = db.Column（db.String（250） ））
 done = db.Column（db.Boolean，default = False）
 startDate = db.Column（db.DateTime，default = datetime.utcnow）
 timeDuration = db.Column db.teger，default = 0）
 isActive = db.Column（db.Boolean，default = True）

目标字段是：

$ p $ lt; code> target_fields = {
'id'：fields.Integer，
'uuid'：fields.String，
'title'：fields.String，
'description' ：fields.String，
'done'：fields.Boolean，
'startDate'：fields.DateTime
＃'uri'：fields.Url（'target'）
}

实际剩余资源为：

<$ p

def __init __（self）：$ b $ self.reqparse = reqparse。 RequestParser（）
self.reqparse.add_argument（'title'，type = str，location ='json'）
self.reqparse.add_argument（'description'，type = str，location ='json' ）
self.reqparse.add_argument（'done'，type = bool，location ='json'）
self.reqparse.add_argument（'startDate'，type = datetime，location ='json'）
self.reqparse.add_argument（'timeDuration'，type = int，location ='json'）
self.reqparse.add_argument（'isActive'，type = bool，location ='json'）
super（TargetAPI，self）.__ init __（）
$ b $ get $（b
$ b $ target

$ 404）

return {'target'：marshal（target，target_fields）}

<完整的堆栈跟踪是：
$ b $ pre $ Traceback（最近调用最后一个）：文件/ usr / local /lib/python2.7/site-packages/flask/app.py，第1836行，在__call__ 中返回self.wsgi_app（environ，start_response）文件/ usr / local / lib / python2在/usr/local/lib/python2中输入.7 / site-packages / flask / app.py，第1820行，在wsgi_app response = self.make_response（self.handle_exception（e）） .7 / site-packages / flask_restful / __init__.py，第258行，在error_router 中返回original_handler（e）文件/usr/local/lib/python2.7/site-packages/flask /app.py，第1403行，在handle_exception reraise（exc_type，exc_value，tb）文件/usr/local/lib/python2.7/site-packages/flask/app.py ，第18行17，在wsgi_app response = self.full_dispatch_request（）文件/usr/local/lib/python2.7/site-packages/flask/app.py，第1477行，在full_dispatch_request rv = self.handle_user_exception（e）文件/usr/local/lib/python2.7/site-packages/flask_restful/__init__.py，第258行，在error_router return original_handler e）文件/usr/local/lib/python2.7/site-packages/flask/app.py，第1381行，在handle_user_exception reraise（exc_type，exc_value，tb）在full_dispatch_request rv = self.dispatch_request（）文件/usr/local/lib/python2.7/site-packages/flask/app.py，第1475行，/ usr /本地/ lib / python2.7 / site-packages / flask / app.py，第1461行，在dispatch_request 返回self.view_functions [rule.endpoint]（** req.view_args）文件 /usr/local/lib/python2.7/site-packages/flask_restful/__init__.py，第397行，在包装中 resp = resource（* args，** kwargs）文件/ usr /local/lib/python2.7/site-packages /flask_httpauth.py，第53行，装饰返回f（* args，** kwargs）文件/usr/local/lib/python2.7/site-packages/flask/views。 py，第84行，在返回self.dispatch_request（* args，** kwargs）文件/usr/local/lib/python2.7/site-packages/flask_restful/__init__.py ，第487行，在dispatch_request resp = meth（* args，** kwargs）文件/Users/nahuel/proj/ptcp/app/resources/targetListAPI.py，第60行， post 'target'：marshal（newTarget，target_fields）}，201 文件/usr/local/lib/python2.7/site-packages/flask_restful/__init__.py，第533行，在marshal return OrderedDict（items）文件/usr/local/Cellar/python/2.7.6_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/collections.py，第52行，在__init__ self .__ update（* args，** kwds）文件/usr/local/Cellar/python/2.7.6_1/Frameworks/Python.framework/Versions/2.7/lib /python2.7/_abcoll.py，第547行，更新作为键值，其他值：文件/usr/local/lib/python2.7/site-packages/flask_restful/__init__.py，第532行，在< genexpr> for k，v in fields.items（））输出$ b中的/usr/local/lib/python2.7/site-packages/flask_restful/fields.py，第109行$ b返回self.format（value）文件/usr/local/lib/python2.7/site-packages/flask_restful/fields.py，第271行，格式为 raise MarshallingException（ae ）

我不能理解为什么要访问datetime.date，因为我总是使用datetime.datetime对象！任何想法？

解决方案

最后解决了问题！为了完整起见，我将发布答案：
本质上，问题是下面的postgresql数据库使用日期类型作为startDate字段，而不是时间戳。所以当Target.startDate对象被sqlalchemy检索的时候，它会为它分配类型datetime.date而不是datetime.datetime。

之前：
表public.target 列|类型|修饰符|存储|统计目标|描述 -------------- + ------------------------ + ----- ------------------------------------------------ + - --------- + -------------- + ------------- id |整数| not null default nextval（'target_id_seq':: regclass）|平原| | uuid |字符变化（256）| |扩展| | title |字符变化（80）| |扩展| | 描述|字符变化（250）| |扩展| | 完成|布尔| |平原| | startDate |日期| |平原| | timeDuration |整数| |平原| | isActive |布尔| |平原| | userId |整数| |平原| |

startDate |时间戳没有时区| |平原| |

I'm trying to get flask-restful to return a datetime field, however it fais with the error:
MarshallingException: 'datetime.date' object has no attribute 'utctimetuple'
The model(sqlalchemy) is the following:
class Target(db.Model): id = db.Column(db.Integer, primary_key=True) uuid = db.Column(db.String(256)) title = db.Column(db.String(80)) description = db.Column(db.String(250)) done = db.Column(db.Boolean, default = False) startDate = db.Column(db.DateTime, default=datetime.utcnow) timeDuration = db.Column(db.Integer, default = 0) isActive = db.Column(db.Boolean, default = True)
The target fields are:
target_fields = { 'id': fields.Integer, 'uuid' : fields.String, 'title': fields.String, 'description': fields.String, 'done': fields.Boolean, 'startDate' : fields.DateTime # 'uri': fields.Url('target') }
The actual rest resouce is:
class TargetAPI(Resource): decorators = [auth.login_required] def __init__(self): self.reqparse = reqparse.RequestParser() self.reqparse.add_argument('title', type = str, location = 'json') self.reqparse.add_argument('description', type = str, location = 'json') self.reqparse.add_argument('done', type = bool, location = 'json') self.reqparse.add_argument('startDate', type = datetime, location = 'json') self.reqparse.add_argument('timeDuration', type = int, location = 'json') self.reqparse.add_argument('isActive', type = bool, location = 'json') super(TargetAPI, self).__init__() def get(self,username, id): target = Target.query.get(id) if not target: abort(404) return { 'target': marshal(target, target_fields) }
The full stack trace is:
Traceback (most recent call last): File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__ return self.wsgi_app(environ, start_response) File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app response = self.make_response(self.handle_exception(e)) File "/usr/local/lib/python2.7/site-packages/flask_restful/__init__.py", line 258, in error_router return original_handler(e) File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception reraise(exc_type, exc_value, tb) File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app response = self.full_dispatch_request() File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request rv = self.handle_user_exception(e) File "/usr/local/lib/python2.7/site-packages/flask_restful/__init__.py", line 258, in error_router return original_handler(e) File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception reraise(exc_type, exc_value, tb) File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request rv = self.dispatch_request() File "/usr/local/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request return self.view_functions[rule.endpoint](**req.view_args) File "/usr/local/lib/python2.7/site-packages/flask_restful/__init__.py", line 397, in wrapper resp = resource(*args, **kwargs) File "/usr/local/lib/python2.7/site-packages/flask_httpauth.py", line 53, in decorated return f(*args, **kwargs) File "/usr/local/lib/python2.7/site-packages/flask/views.py", line 84, in view return self.dispatch_request(*args, **kwargs) File "/usr/local/lib/python2.7/site-packages/flask_restful/__init__.py", line 487, in dispatch_request resp = meth(*args, **kwargs) File "/Users/nahuel/proj/ptcp/app/resources/targetListAPI.py", line 60, in post 'target': marshal(newTarget, target_fields) }, 201 File "/usr/local/lib/python2.7/site-packages/flask_restful/__init__.py", line 533, in marshal return OrderedDict(items) File "/usr/local/Cellar/python/2.7.6_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/collections.py", line 52, in __init__ self.__update(*args, **kwds) File "/usr/local/Cellar/python/2.7.6_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/_abcoll.py", line 547, in update for key, value in other: File "/usr/local/lib/python2.7/site-packages/flask_restful/__init__.py", line 532, in <genexpr> for k, v in fields.items()) File "/usr/local/lib/python2.7/site-packages/flask_restful/fields.py", line 109, in output return self.format(value) File "/usr/local/lib/python2.7/site-packages/flask_restful/fields.py", line 271, in format raise MarshallingException(ae)
I can't for the life of me understand why is it trying to access datetime.date, since I always use datetime.datetime objects! Any ideas?
解决方案
Finally fixed the issue! For the sake of completness, I'll post the answer: Essentially, the problem was that the postgresql database underneath was using a date type for the 'startDate' field, instead of a timestamp one. So when the Target.startDate object was retrieved by sqlalchemy, it was assigning it the type datetime.date instead of datetime.datetime.

Before:
Table "public.target" Column | Type | Modifiers | Storage | Stats target | Description --------------+------------------------+-----------------------------------------------------+----------+--------------+------------- id | integer | not null default nextval('target_id_seq'::regclass) | plain | | uuid | character varying(256) | | extended | | title | character varying(80) | | extended | | description | character varying(250) | | extended | | done | boolean | | plain | | startDate | date | | plain | | timeDuration | integer | | plain | | isActive | boolean | | plain | | userId | integer | | plain | |
After:
startDate | timestamp without time zone | | plain | |

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