[英]Missing required positional argument (datetime)
I am new Flask and Postgres... 我是新的Flask和Postgres ...
I am following this tutorial: https://auth0.com/blog/using-python-flask-and-angular-to-build-modern-apps-part-1/ 我正在关注本教程: https : //auth0.com/blog/using-python-flask-and-angular-to-build-modern-apps-part-1/
I have created a Entity like this: 我创建了一个这样的实体:
from marshmallow import Schema, fields
from sqlalchemy import Column, String, Boolean, Date
from .entity import Entity, Base
class Strategy(Entity, Base):
__tablename__ = 'strategies'
name = Column(String)
description = Column(String)
startDate = Column(Date)
endDate = Column(Date)
allowTeamToVote = Column(Boolean)
votingDeadline = Column(Date)
isActive = Column(Boolean)
def __init__(self, name, description, startDate, endDate, allowTeamToVote, votingDeadline, created_by):
Entity.__init__(self, created_by)
self.name = name
self.description = description
self.startDate = startDate
self.endDate = endDate
self.allowTeamToVote = allowTeamToVote
self.votingDeadline = votingDeadline
self.isActive = True
class StrategySchema(Schema):
id = fields.Number()
name = fields.Str()
description = fields.Str()
startDate = fields.DateTime()
endDate = fields.DateTime()
allowTeamToVote = fields.Boolean()
votingDeadline = fields.DateTime()
isActive = fields.Boolean()
created_at = fields.DateTime()
updated_at = fields.DateTime()
last_updated_by = fields.Str()
and a Post Method: 和一个Post方法:
@app.route('/strategies', methods=['POST'])
@requires_auth
def add_strategy():
# mount Strategy object
print(request.get_json())
posted_strategy = StrategySchema(only=('name', 'description', 'startDate', 'endDate', 'allowTeamToVote', 'votingDeadline', 'isActive'))\
.load(request.get_json())
print(posted_strategy.data)
strategy = Strategy(**posted_strategy.data, created_by="HTTP post request")
# persist Strategy
session = Session()
session.add(strategy)
session.commit()
# return created Strategy
new_strategy = StrategySchema().dump(Strategy).data
session.close()
return jsonify(new_strategy), 201
What doesn't getting converted when .load(request.get_json()) method is called is all three datetime values. 调用.load(request.get_json())方法时未转换的是所有三个datetime值。
I get the following error: 我收到以下错误:
__init__() missing 3 required positional arguments: 'startDate', 'endDate', and 'votingDeadline'
What am I doing wrong? 我究竟做错了什么?
1st print statement: 第一份印刷声明:
{'objectives': [{'name': 'afasdfdsa'}], 'name': 'sdasdfdsaf', 'description': 'df {'objectives':[{'name':'afasdfdsa'}],'name':'sdasdfdsaf','description':'df
asfasdf', 'startDate': '05/31/2018', 'endDate': '05/31/2018', 'allowTeamToVote': asfasdf','startDate':'05/31/2018','endDate':'05/31/2018','allowTeamToVote':
True, 'votingDeadline': '05/31/2018'} True,'votingDeadline':'05 / 31/2018'}
2nd print statement: 第二份印刷声明:
{'allowTeamToVote': True, 'name': 'asfdfsd', 'description': 'dsfasdfs'} {'allowTeamToVote':True,'name':'asfdfsd','description':'dsfasdfs'}
Full Exception: 完全例外:
127.0.0.1 - - [16/May/2018 20:43:43] "OPTIONS /strategies HTTP/1.1" 200 - [2018-05-16 20:43:44,712] ERROR in app: Exception on /strategies [POST] Traceback (most recent call last): File "c:\\users\\jason.virtualenvs\\backend-foekiio5\\lib\\site-packages\\flask\\app.py", line 1982, in wsgi_app response = self.full_dispatch_request() File "c:\\users\\jason.virtualenvs\\backend-foekiio5\\lib\\site-packages\\flask\\app.py", line 1614, in full_dispatch_request rv = self.handle_user_exception(e) File "c:\\users\\jason.virtualenvs\\backend-foekiio5\\lib\\site-packages\\flask_cors\\extension.py", line 161, in wrapped_function return cors_after_request(app.make_response(f(*args, **kwargs))) File "c:\\users\\jason.virtualenvs\\backend-foekiio5\\lib\\site-packages\\flask\\app.py", line 1517, in handle_user_exception reraise(exc_type, exc_value, tb) File "c:\\users\\jason.virtualenvs\\backend-foekiio5\\lib\\site-packages\\flask_compat.py", line 33, in reraise raise value File "c:\\users\\jason.virtualenvs\\backend-foekiio5\\lib\\site-p 127.0.0.1--[16 / May / 2018 20:43:43]“ OPTIONS / strategys HTTP / 1.1” 200-[2018-05-16 20:43:44,712]应用程序中出现错误:/ strategies异常[POST]追溯(最近一次通话最近):文件“ c:\\ users \\ jason.virtualenvs \\ backend-foekiio5 \\ lib \\ site-packages \\ flask \\ app.py”,行1982,在wsgi_app response = self.full_dispatch_request()文件中c:\\ users \\ jason.virtualenvs \\ backend-foekiio5 \\ lib \\ site-packages \\ flask \\ app.py“,行1614,在full_dispatch_request中rv = self.handle_user_exception(e)文件” c:\\ users \\ jason.virtualenvs \\ backend-foekiio5 \\ lib \\ site-packages \\ flask_cors \\ extension.py“,第161行,在wrapped_function中,返回cors_after_request(app.make_response(f(* args,** kwargs)))文件” c:\\ users \\ jason.virtualenvs \\ backend-foekiio5 \\ lib \\ site-packages \\ flask \\ app.py“,第1517行,在handle_user_exception reraise中(exc_type,exc_value,tb)文件“ c:\\ users \\ jason.virtualenvs \\ backend-foekiio5 \\ lib \\ site- “ packages \\ flask_compat.py”,第33行,重新提高价值文件“ c:\\ users \\ jason.virtualenvs \\ backend-foekiio5 \\ lib \\ site-p ackages\\flask\\app.py", line 1612, in full_dispatch_request rv = self.dispatch_request() File "c:\\users\\jason.virtualenvs\\backend-foekiio5\\lib\\site-packages\\flask\\app.py", line 1598, in dispatch_request return self.view_functionsrule.endpoint File "C:\\projects\\Python Projects\\three-back\\backend\\src\\auth.py", line 101, in decorated return f(*args, **kwargs) File "C:\\projects\\Python Projects\\three-back\\backend\\src\\main.py", line 41, in add_strategy strategy = Strategy(**posted_strategy.data, created_by="HTTP post request") TypeError: init () missing 3 required positional arguments: 'startDate', 'endDate', and 'votingDeadline' 127.0.0.1 - - [16/May/2018 20:43:44] "POST /strategies HTTP/1.1" 500 - ackages \\ flask \\ app.py”,行1612,在full_dispatch_request中rv = self.dispatch_request()文件“ c:\\ users \\ jason.virtualenvs \\ backend-foekiio5 \\ lib \\ site-packages \\ flask \\ app.py”,行1598,在dispatch_request中返回self.view_functionsrule.endpoint文件“ C:\\ projects \\ Python Projects \\ three-back \\ backend \\ src \\ auth.py”,行101,在修饰后的return f(* args,** kwargs)File“ C:\\ projects \\ Python Projects \\ three-back \\ backend \\ src \\ main.py“,第41行,位于add_strategy strategy = Strategy(** posted_strategy.data,created_by =” HTTP post request“)TypeError: init ()missing 3个必需的位置参数:“ startDate”,“ endDate”和“ votingDeadline” 127.0.0.1--[16 / May / 2018 20:43:44]“ POST / strategys HTTP / 1.1” 500-
What doesn't getting converted when .load(request.get_json()) method is called is all three datetime values. 调用.load(request.get_json())方法时未转换的是所有三个datetime值。
Your second print
statement is outside of the function. 您的第二个print
语句不在函数之外。 So you are getting the wrong output. 所以您得到错误的输出。
I get the following error: 我收到以下错误:
You are passing a dict(key-value pairs) to the method but it is expecting positional arguments. 您正在将dict(键值对)传递给方法,但它需要位置参数。
Change this line to this: 将此行更改为此:
`strategy = Strategy(*posted_strategy.data.values(), created_by="HTTP post request")`
In all, something like this: 总而言之,是这样的:
@app.route('/strategies', methods=['POST'])
@requires_auth
def add_strategy():
# mount Strategy object
print(request.get_json())
posted_strategy = StrategySchema(only=('name', 'description', 'startDate', 'endDate', 'allowTeamToVote', 'votingDeadline', 'isActive'))\
.load(request.get_json())
print(posted_strategy.data)
strategy = Strategy(*posted_strategy.data.values(), created_by="HTTP post request")
Marshmallow has another way of achieving the same result, as noted in the documentation here . 如此处的文档所述,棉花糖还有另一种获得相同结果的方法。
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