I have a very simple Flask RESTful API that I have built following the Packt book "Python API Development Fundamentals". I can successfully get data from the DB but I'm having trouble posting data.
I am using Flask, SQLAlchemy, and flask_restful, and a Microsoft Server Management Studio local database.
I am currently getting an error when trying to insert an entry into the Users table. A user is only an ID, Name, Age. I am following the books example which you can find here: https://github.com/TrainingByPackt/Python-API-Development-Fundamentals/tree/master/Lesson03/Exercise19
If you do take a look at the example, you can see that the example code they used for the get method also did not work for me, and I came up with my own strategy. But I'm having some trouble figuring out a strategy for the post method.
I am getting this error in the users.py resource when I try this httpie command: http POST localhost:5000/users Name="Kyle" Age="22"
error
[2021-03-29 15:40:58,891] ERROR in app: Exception on /users [POST]
Traceback (most recent call last):
File "c:\users\e096752\documents\cole's projects\flask projects\testproj\venv\lib\site-packages\flask\app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "c:\users\e096752\documents\cole's projects\flask projects\testproj\venv\lib\site-packages\flask\app.py", line 1936, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "c:\users\e096752\documents\cole's projects\flask projects\testproj\venv\lib\site-packages\flask_restful\__init__.py", line 468, in wrapper
resp = resource(*args, **kwargs)
File "c:\users\e096752\documents\cole's projects\flask projects\testproj\venv\lib\site-packages\flask\views.py", line 89, in view
return self.dispatch_request(*args, **kwargs)
File "c:\users\e096752\documents\cole's projects\flask projects\testproj\venv\lib\site-packages\flask_restful\__init__.py", line 583, in dispatch_request
resp = meth(*args, **kwargs)
File "C:\Users\e096752\Documents\Cole's Projects\Flask Projects\testProj\resources\users.py", line 27, in post
return user.data, HTTPStatus.CREATED
AttributeError: 'User' object has no attribute 'data'
That said, and this is one of the reasons I didn't use the books example, I have no idea what the userList list in the model does or why I would add the newly created user to it. I don't see anywhere where that actually gets pushed to the database. It just gets put in a list.
users resource
from flask import request
from flask_restful import Resource
from http import HTTPStatus
from flask import jsonify
from sqlToJson import convert_sqlaLchamy_to_json
from models.Users import User, userList
class User_List_Resource(Resource):
def get(self):
users = User.query.all()
data = jsonify(convert_sqlaLchamy_to_json(users))
return data
def post(self):
data = request.get_json()
user = User(Name=data['Name'],
Age=data['Age'])
userList.append(user)
return user.data, HTTPStatus.CREATED
And by the way, the sqlToJson is a file that I wrote because I couldn't get the example in the book to work.
Users model
from extensions import db
userList = []
def get_last_id():
if userList:
lastUser = userList[-1]
else:
return 1
return lastUser.id + 1
class User(db.Model):
__tablename__ = 'Users'
ID = db.Column(db.Integer, primary_key=True)
Name = db.Column(db.String(50))
Age = db.Column(db.Integer)
app.py
from flask import Flask, render_template
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy import create_engine
from flask_restful import Resource, Api
from flask import jsonify
import json
from sqlToJson import convert_sqlaLchamy_to_json
import datetime
from flask_restful import Api
from config import Config
from extensions import db
from models.Case_Log import Case_Log
from resources.case_log import Case_Log_List_Resource
from models.Users import User
from resources.users import User_List_Resource
from resources.home import Home_Resource
def create_app():
app = Flask(__name__)
app.config.from_object(Config)
register_extensions(app)
register_resources(app)
return app
def register_extensions(app):
db.init_app(app)
def register_resources(app):
api = Api(app)
#Add all resources as routes
api.add_resource(Home_Resource, '/')
api.add_resource(Case_Log_List_Resource, '/case_logs')
api.add_resource(User_List_Resource, '/users')
if __name__ == '__main__':
app = create_app()
app.run()
Any help would be greatly appreciated.
