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I have an oracle procedure that when receiving some parameters, throw results in a string with JSON format like the following:

"list_pais": [ "pais":"URUGUAY","pais":"ARGENTINA","pais":"PARAGUAY","pais":"VENEZUELA"] 

This procedure is invoked from a webservice in Python that I developed with FlaskResfutl to create the swagger and this is de code:

import cx_Oracle
import json
from app import APP
import log
import graypy
import database
from flask_restplus import Api, Resource, fields

with open('./config/config_countries.json', 'r') as config_file:
 config = json.load(config_file)

log.init()

#Se inicializa la base de datos
#Importando de database la conexión a la BD
database.init()

#Invoca al archivo de configuración
with open('./config/config_countries.json', 'r') as config_file:
 config = json.load(config_file)

with open('./config/config_general.json', 'r') as config_file:
 config_general = json.load(config_file)

srv_name = config["CONFIG"]["LOG_TAG"]
db_str = config["CONFIG"]["DB"]
max_return = config_general["CONFIG"]["MAX_RETURN"]
limite = config["CONFIG"]["LIMIT_PER_SECOND"]
api = Api(APP, version='1.0', title=srv_name,
 description='getCountries de Callejero Predictivon'
 'Conexión a BD:' + db_str + 'n'
 'Cantidad máxima de invocaciones por segundo:' + limite)

ns = api.namespace('getCountry', description='getCountries de Callejero Predictivo')


md_respuesta = 'pais': fields.String(required=True, description='Agrupador de Paises'), 'list_pais': fields.Nested(fields.String)


@ns.route('/<string:country>')
@ns.response(200, 'Success')
@ns.response(404, 'Not found')
@ns.response(429, 'Too many request')
@ns.param('country', 'Introducir Cadena de Caracteres para el Pais')
class getCountryClass(Resource):
 @ns.doc('getCountry')
 @ns.marshal_list_with(md_respuesta)
 def post(self, country):
 try:
 cur = database.db.cursor()
 listOutput = cur.var(cx_Oracle.STRING)
 cur.callproc('PREDICTIVO.get_pais', (country, max_return, listOutput))
 except Exception as e:
 database.init()
 if database.db is not None:
 log.err('Reconexion OK')
 cur = database.db.cursor()
 listOutput = cur.var(cx_Oracle.STRING)
 cur.callproc('PREDICTIVO.get_pais', (country, max_return, listOutput))
 else:
 log.err('Sin conexion a la base de datos')
 listOutput = None


 return listOutput, 200

But when executing it, it generates the following error:

Running on http://127.0.0.1:5200/ (Press CTRL+C to quit)
127.0.0.1 - - [12/Nov/2018 15:52:21] "GET / HTTP/1.1" 200 -
Unable to render schema
Traceback (most recent call last):
 File "C:Program FilesPython37libsite-packagesflask_restplusapi.py", line 483, in __schema__
 self._schema = Swagger(self).as_dict()
 File "C:Program FilesPython37libsite-packagesflask_restplusswagger.py", line 177, in as_dict
 paths[extract_path(url)] = self.serialize_resource(ns, resource, url, kwargs)
 File "C:Program FilesPython37libsite-packagesflask_restplusswagger.py", line 346, in serialize_resource
 path[method] = self.serialize_operation(doc, method)
 File "C:Program FilesPython37libsite-packagesflask_restplusswagger.py", line 352, in serialize_operation
 'responses': self.responses_for(doc, method) or None,
 File "C:Program FilesPython37libsite-packagesflask_restplusswagger.py", line 464, in responses_for
 responses[code]['schema'] = self.serialize_schema(model)
 File "C:Program FilesPython37libsite-packagesflask_restplusswagger.py", line 509, in serialize_schema
 'items': self.serialize_schema(model),
 File "C:Program FilesPython37libsite-packagesflask_restplusswagger.py", line 529, in serialize_schema
 raise ValueError('Model 0 not registered'.format(model))
ValueError: Model 'pais': <flask_restplus.fields.String object at 0x00000189FFB94C88>, 'list_pais': <flask_restplus.fields.Nested object at 0x00000189FFB94F28> not registered
127.0.0.1 - - [12/Nov/2018 15:52:22] "GET /swagger.json HTTP/1.1" 500 -

and I can not find how to solve it.
Could someone give me clues to solve it?

Here the good versión in production without the swagger working
https://github.com/alemarchan/sources_predictivo_prod

Looking at https://flask-restplus.readthedocs.io/en/stable/_modules/flask_restplus/swagger.html and https://flask-restplus.readthedocs.io/en/stable/quickstart.html

The registered model can't be a dict, you need a model, try to replace

md_respuesta = 'pais': fields.String(required=True, description='Agrupador de Paises'), 'list_pais': fields.Nested(fields.String)

by

md_respuesta = api.model('Pais', 'pais': fields.String(required=True, description='Agrupador de Paises'), 'list_pais': fields.Nested(fields.String))