我是新的Flask和Postgres ......
我正在关注本教程: https://auth0.com/blog/using-python-flask-and-angular-to-build-modern-apps-part-1/
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()
和后期方法:
@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
调用.load(request.get_json())方法时,没有转换的是三个日期时间值。
我收到以下错误:
__init__() missing 3 required positional arguments: 'startDate', 'endDate', and 'votingDeadline'
我做错了什么?
第一份印刷声明:
{'目标':[{'名称':' afasdfdsa'}],' name':' sdasdfdsaf&# 39 ;, '描述':' df
asfasdf',' startDate':' 05/31/2018',' endDate':' 05/31/2018', ' allowTeamToVote&#39 ;:
是的,' votingDeadline':' 05/31/2018'}
第二份印刷声明:
{' allowTeamToVote':是的,'名称':' asfdfsd',' description': ' dsfasdfs'}
完全例外:
127.0.0.1 - - [16 / May / 2018 20:43:43]"选项/策略HTTP / 1.1" 200 - [2018-05-16 20:43:44,712]应用程序中的错误:/策略的例外情况 [POST] Traceback(最近一次调用最后一次):文件 " C:\用户\ jason.virtualenvs \后端-foekiio5 \ lib中\站点包\烧瓶\ app.py&#34 ;, 1982年,在wsgi_app response = self.full_dispatch_request()文件" c:\ users \ jason.virtualenvs \ backend-foekiio5 \ lib \ site-packages \ flask \ app.py", 第1614行,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 return cors_after_request(app.make_response(f(* args,** kwargs)))文件 " C:\用户\ jason.virtualenvs \后端-foekiio5 \ lib中\站点包\烧瓶\ app.py&#34 ;, 第1517行,在handle_user_exception中 reraise(exc_type,exc_value,tb)文件" c:\ users \ jason.virtualenvs \ backend-foekiio5 \ lib \ site-packages \ flask_compat.py", 第33行,重新加入 提高值文件" c:\ users \ jason.virtualenvs \ backend-foekiio5 \ lib \ site-packages \ flask \ app.py", 第1612行,在full_dispatch_request中 rv = self.dispatch_request()文件" c:\ users \ jason.virtualenvs \ backend-foekiio5 \ lib \ site-packages \ flask \ app.py", 第1598行,在dispatch_request中 return self.view_functionsrule.endpoint File" C:\ projects \ Python Projects \ three-back \ backend \ src \ auth.py",line 101,装饰 返回f(* args,** kwargs)文件" C:\ projects \ Python Projects \ three-back \ backend \ src \ main.py",第41行,在add_strategy中 strategy =策略(** published_strategy.data,created_by =" HTTP post request")TypeError: init ()缺少3个必需的位置 争论:' startDate',' endDate'和' votingDeadline' 127.0.0.1 - - [16 / May / 2018 20:43:44]" POST /策略HTTP / 1.1" 500 -
答案 0 :(得分:0)
.load(request.get_json())方法无法转换的内容 被称为所有三个日期时间值。
您的第二个print
语句不属于该函数。所以你输错了。
我收到以下错误:
您正在将dict(键值对)传递给方法,但它期待位置参数。
将此行更改为:
`strategy = Strategy(*posted_strategy.data.values(), created_by="HTTP post request")`
总之,这样的事情:
@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有另一种方法可以达到相同的效果,如documentation here中所述。