Flask API TypeError：“响应”类型的对象不是 JSON 可序列化的
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【中文标题】Flask API TypeError：“响应”类型的对象不是 JSON 可序列化的【英文标题】：Flask API TypeError: Object of type 'Response' is not JSON serializable 【发布时间】：2017-11-09 21:13:48 【问题描述】：我在使用 Python Flask Restful API 时遇到问题，并且数据进入 Elasticsearch，当我使用 Postman 发布新数据时，问题是：
TypeError：“响应”类型的对象不是 JSON 可序列化的
你能帮帮我吗？
型号：
from marshmallow import Schema, fields, validate
class Person(object):
def __init__(self,tcno=None,firstname=None,lastname=None,email=None,birthday=None,country=None,gender=None):
self.__tcno = tcno
self.__firstname = firstname
self.__lastname = lastname
self.__email = email
self.__birthday = birthday
self.__country = country
self.__gender = gender
def __repr__(self):
return '<Person(firstname=self.__firstname!r)>'.format(self=self)
class PersonSchema(Schema):
tcno = fields.Str(required=True,validate=[validate.Length(min=11, max=11)])
firstname = fields.Str(required=True)
lastname = fields.Str(required=True)
email = fields.Email(required=True,validate=validate.Email(error="Not a valid email"))
birthday = fields.Date(required=True)
country = fields.Str()
gender = fields.Str()
查看：
from flask import Response, json, request, jsonify, Flask
import requests
from flask_marshmallow import Marshmallow
from flask_restful import Api, Resource
from Person import Person, PersonSchema
app = Flask(__name__)
api = Api(app)
ma = Marshmallow(app)
class Apici(Resource):
def __init__(self):
pass
def get(self,people_id):
url = "http://localhost:9200/people/person/".format(people_id)
headers = "Content-type": "application/json"
r = requests.get(url=url, headers=headers)
json_data = json.loads(r.text)
if json_data['found'] is False:
mesaj = json.dumps("found": "False")
resp = Response(mesaj, status=201, mimetype='application/json')
return resp
return json_data["_source"]
def post(self,people_id):
json_input = request.get_json()
person_schema = PersonSchema()
person, errors = person_schema.load(json_input)
if errors:
return jsonify('errors': errors), 422
#result = person_schema(person)
url = "http://localhost:9200/people/person/".format(people_id)
headers = "Content-type": "application/json"
print(url)
r = requests.post(url=url, json=json_input, headers=headers)
print(r)
json_data = json.loads(r.text)
if json_data["result"] is "Updated":
message = json.loads("result": "updated")
resp = Response(message, status=201, mimetype='application/json')
return resp
message = json.loads("result": "created")
resp = Response(message, status=201, mimetype='application/json')
return resp #jsonify(result.data)
def put(self):
json_input = request.get_json()
person_schema = PersonSchema()
person, errors = person_schema.load(json_input)
if errors:
return jsonify('errors': errors), 422
result = person_schema(person)
url = "http://localhost:9200/people/person/".format(request.url[-1])
headers = "Content-type": "application/json"
r = requests.post(url=url, json=json_input, headers=headers)
json_data = json.loads(r.text)
if json_data["result"] is "Updated":
message = json.dumps("result": "updated")
resp = Response(message, status=201, mimetype='application/json')
return resp
message = json.dumps("result": "created")
resp = Response(message, status=201, mimetype='application/json')
return resp #jsonify(result.data)
def delete(self):
url = "http://localhost:9200/people/person/".format(request.url[-1])
headers = "Content-type": "application/json"
r = requests.delete(url=url,headers=headers)
json_data = json.loads(r.text)
if json_data["result"] == "not_found":
message = json.dumps("result": "not_found")
return Response(message, status=201, mimetype='application/json')
message = json.dumps("result": "deleted")
resp = Response(message, status=201, mimetype='application/json')
return resp
class ApiciList(Resource):
def __init__(self):
pass
def get(self):
url = "http://localhost:9200/people/person/_search"
body = "query": "match_all":
headers = "Content-type": "application/json"
r = requests.get(url=url, json=body, headers=headers)
json_data = json.loads(r.text)
return json_data["hits"]["hits"]
api.add_resource(ApiciList, '/person')
api.add_resource(Apici, '/person/<string:people_id>')
if __name__ == '__main__':
app.run(port=5010,debug=True)
错误：
127.0.0.1 - - [08/Jun/2017 11:37:18] "POST /person/1 HTTP/1.1" 500 -
Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1997, in __call__
return self.wsgi_app(environ, start_response)
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1985, in wsgi_app
response = self.handle_exception(e)
File "/usr/local/lib/python3.6/dist-packages/flask_restful/__init__.py", line 271, in error_router
return original_handler(e)
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1540, in handle_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.6/dist-packages/flask/_compat.py", line 32, in reraise
raise value.with_traceback(tb)
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1982, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1614, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.6/dist-packages/flask_restful/__init__.py", line 271, in error_router
return original_handler(e)
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1517, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.6/dist-packages/flask/_compat.py", line 32, in reraise
raise value.with_traceback(tb)
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1612, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1598, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/usr/local/lib/python3.6/dist-packages/flask_restful/__init__.py", line 481, in wrapper
return self.make_response(data, code, headers=headers)
File "/usr/local/lib/python3.6/dist-packages/flask_restful/__init__.py", line 510, in make_response
resp = self.representations[mediatype](data, *args, **kwargs)
File "/usr/local/lib/python3.6/dist-packages/flask_restful/representations/json.py", line 20, in output_json
dumped = dumps(data, **settings) + "\n"
File "/usr/lib/python3.6/json/__init__.py", line 238, in dumps
**kw).encode(obj)
File "/usr/lib/python3.6/json/encoder.py", line 201, in encode
chunks = list(chunks)
File "/usr/lib/python3.6/json/encoder.py", line 437, in _iterencode
o = _default(o)
File "/usr/lib/python3.6/json/encoder.py", line 180, in default
o.__class__.__name__)
TypeError: Object of type 'Response' is not JSON serializable
编辑： 我发现了问题。它在 def post(self,people_id) 方法中：
if errors:
return jsonify('errors': errors), 422
换行：
if errors:
message = json.dumps('errors': errors)
return Response(message, status=422, mimetype='application/json')
【问题讨论】：
不要将message 包裹在Response 中。直接返回即可。
【参考方案1】：
受bug 的启发，这里有一个更短的方法：
from flask import jsonify, make_response
def myMethod():
....
return make_response(jsonify(data), 200)
【讨论】：
【参考方案2】：这可以通过以下方式简单地完成：
from flask import jsonify
def myMethod():
....
response = jsonify(data)
response.status_code = 200 # or 400 or whatever
return response
【讨论】：
如果我想渲染模板 paralalay retuen res,200,render_template() 怎么用这个【参考方案3】：我也遇到过类似的问题，问题是我用了两次 jsonify (jsonify(jsonify(abc:123)))
【讨论】：
【参考方案4】：def post(self):
some_json=request.get_json()
return jsonify('you sent ':some_json)
足以解决这个问题
【讨论】：
【参考方案5】：这个我们可以试试
response=response.json()
response=json.dumps(response)
【讨论】：
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