POST to one-to-many relationship table raise ValidationError "Unknown field." - python-3.x

Question

I am trying to implement hospital api with to one-to-many relationship table (Subject - is Parent table, RawData - child table), with flask-api, marshmellow and flask-sqlalchemy frameworks. After implementing schemes, models and resource, I make post method with raw json, through postman in endpoint /api/upload/subject:
{
"first_name": "Johny",
"last_name": "Silverhand",
"raw_tomograms": [
{
"rawdata_id": 1,
"raw_name": "subject_1",
"path": "/srv/John_s_rawdata.zip",
"subject_id": 1
}
]
}
But get an error marshmallow.exceptions.ValidationError: {'raw_tomograms': {0: {'rawdata_id': ['Unknown field.'], 'raw_name': ['Unknown field.'], 'path': ['Unknown field.']}}}
Models:
#./api/models/subject.py:
from flask_sqlalchemy import SQLAlchemy
from datetime import datetime
from api.database import db
class Subject(db.Model):
__tablename__ = "subject"
id = db.Column(db.Integer, primary_key=True)
first_name = db.Column(db.String(50), nullable=True)
last_name = db.Column(db.String(50), nullable=True)
raw_tomograms = db.relationship("RawData", backref="subject", lazy=True)
create_date = db.Column(db.DateTime(timezone=True), default=datetime.now())
update_date = db.Column(db.DateTime(timezone=True), onupdate=datetime.now())
def __repr__(self):
return "<Subject {self.id} {self.first_name>"
#./api/models/rawdata.py:
from flask_sqlalchemy import SQLAlchemy
from datetime import datetime
from api.database import db
class RawData(db.Model):
__tablename__ = "raw_data"
id = db.Column(db.Integer, primary_key=True)
raw_name = db.Column(db.String(120), nullable=False)
path = db.Column(db.String(250))
create_date = db.Column(db.DateTime(timezone=True), default=datetime.now)
update_date = db.Column(db.DateTime(timezone=True), onupdate=datetime.now)
subject_id = db.Column(db.Integer, db.ForeignKey("subject.id"))
def __repr__(self):
return f"<Raw_data {self.id}>"
Schemas:
#./api/schemas/rawdata.py:
from marshmallow import Schema, fields, post_load, EXCLUDE
from api.models.rawdata import RawData
from api.models.subject import Subject
from api.database import db
from api.database import ma
class RawSchema(Schema):
rawdata_id = fields.Integer(),
raw_name = fields.String(),
path = fields.String(),
create_date = fields.DateTime(timezone=True)
update_date = fields.DateTime(timezone=True)
subject_id = fields.Integer()
#post_load
def make_rawdata(self, data, **kwargs):
return RawData(**data)
#./api/schemas/subjecta.py:
from marshmallow import Schema, fields, post_load
from epidetect_api.models.subject import Subject
from epidetect_api.database import db
#from epidetect_api.database import ma
from epidetect_api.schemas.rawdata_schema import RawSchema
class SubjectSchema(Schema):
"""
Subject Marshmallow Schema
Marshmallow schema used for loading/dumping Subject
"""
#raw_tomograms = ma.Nested(RawSchema, many=True)
class Meta:
model = Subject
#exclude =
id = fields.Integer(load=True, partial=True)
first_name = fields.String(allow_none=True)
last_name = fields.String(allow_none=True)
create_date = fields.DateTime(timezone=True)
update_date = fields.DateTime(timezone=True)
raw_tomograms = fields.Nested(RawSchema, many=True)
#post_load
def make_subject(self, data, **kwargs):
return Subject(**data)
Resource:
#./api/resources/subject_resource.py
import logging
from flask import request, jsonify, render_template
from flask_restful import Resource, abort
from sqlalchemy.exc import IntegrityError
from sqlalchemy.orm.exc import NoResultFound
import json
from api.database import db
from api.models.subject import Subject
from api.schemas.subject_schema import SubjectSchema
SUBJECTS_ENDPOINT = "/api/upload/subject"
logger = logging.getLogger(__name__)
class SubjectsResource(Resource):
def post(self):
"""
SubjectsResource POST method. Adds a new Subject to the database.
:return: Subject.id, 201 HTTP status code.
"""
subject = SubjectSchema().load(request.json)
print(request.json, flush=True)
try:
db.session.add(subject)
db.session.commit()
except IntegrityError as e:
logger.warning(
f"Integrity Error, this subject is already in the database. Error: {e}"
)
abort(500, message="Unexpected Error!")
else:
return subject.id, 201
Full error log:
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2091, in __call__
return self.wsgi_app(environ, start_response)
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2076, in wsgi_app
response = self.handle_exception(e)
File "/usr/local/lib/python3.7/site-packages/flask_restful/__init__.py", line 271, in error_router
return original_handler(e)
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2073, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1518, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.7/site-packages/flask_restful/__init__.py", line 271, in error_router
return original_handler(e)
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1516, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1502, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
File "/usr/local/lib/python3.7/site-packages/flask_restful/__init__.py", line 467, in wrapper
resp = resource(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/flask/views.py", line 84, in view
return current_app.ensure_sync(self.dispatch_request)(*args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/flask_restful/__init__.py", line 582, in dispatch_request
resp = meth(*args, **kwargs)
File "/srv/api/resources/subject_resource.py", line 48, in post
subject = SubjectSchema().load(request.json)
File "/usr/local/lib/python3.7/site-packages/marshmallow/schema.py", line 720, in load
data, many=many, partial=partial, unknown=unknown, postprocess=True
File "/usr/local/lib/python3.7/site-packages/marshmallow/schema.py", line 904, in _do_load
raise exc
marshmallow.exceptions.ValidationError: {'raw_tomograms': {0: {'rawdata_id': ['Unknown field.'], 'raw_name': ['Unknown field.'], 'path': ['Unknown field.']}}}