I have been struggling with the buy portion of the finance assignment for CS50. I have created my new tables and written down the logic concerning buying stocks. When I run flask and try to purchase stocks I get a run time error saying that the name, price and symbol of the stocks are 'unsupported values.'
Attached my code. Could someone point me in the right direction?
Thanks!
Rutger
- buy.html {% extends "layout.html" %}
{% block title %} Buy {% endblock %}
{% block main %} <button id="submit class="btn btn-primary" type="submit">Submit
{% endblock %}
buy in application.py @app.route("/buy", methods=["GET", "POST"]) @login_required def buy():
#requires creation of two tables in db. #1)table that stores transaction details #2) table that stores stocks beloning to user
"""Buy shares of stock""" if request.method =="POST":
# store lookup; quantity and price in variable stock_lookup = lookup(request.form.get("symbol")) quantity = int(request.form.get("quantity")) stock_price = stock_lookup["price"] user_id = session["user_id"] # check for correct symbol if not stock_lookup: return apology("Unable to find stock", 403) # make sure user inputs at least 1 share elif quantity <1: return apology("Must be positive number", 403) #company in db? company_exist = db.execute("SELECT company_id FROM company_overview WHERE company_symbol = :symbol", symbol=stock_lookup) #if company not present in db, insert into db if len(company_exist)== 0: company_id = db.execute("INSERT INTO 'company_overview' ('company_name', 'company_symbol) VALUES (:name, :symbol)", name = stock_lookup["name"], symbol=stock_lookup["symbol"]) else: company_id = company_exist[0]["company_id"] #check if wallet can accomodate transaction wallet = db.execute("SELECT cash FROM users WHERE id=:user_id", user_id=session["user_id"])[0]["cash"] #price calculation value = stock_price * quantity #display error message if value exceeds wallet if value > wallet: return apology("You do not have sufficient funds", 403) #value of wallet after purchasing stock wallet = wallet - value #append transaction to cash balance in user db db.execute("UPDATE users SET cash=:cash WHERE user_id=:user_id", cash=wallet, user_id=user_id) #append transaction to transaction_overview db.execute("""INSERT INTO 'transaction_overview' ('user_id', 'company_id', 'quantity', 'stock_price', 'timestamp') VALUES (:user_id, :company_id, :quantity, :stock_price, datetime('now'))""", user_id=user_id, company_id = company_id, quantity=quantity, stock_price=stock_price) #return bought message for user flash("Purchased") return redirect("/")else: return render_template("buy.html")
The error I am getting ERROR:application:Exception on /buy [POST] Traceback (most recent call last): File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2447, in wsgi_app response = self.full_dispatch_request() File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1952, in full_dispatch_request rv = self.handle_user_exception(e) File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1821, in handle_user_exception reraise(exc_type, exc_value, tb) File "/usr/local/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise raise value File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1950, in full_dispatch_request rv = self.dispatch_request() File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1936, in dispatch_request return self.view_functionsrule.endpoint File "/home/ubuntu/pset8/finance/helpers.py", line 34, in decorated_function return f(*args, **kwargs) File "/home/ubuntu/pset8/finance/application.py", line 76, in buy company_exist = db.execute("SELECT company_id FROM company_overview WHERE company_symbol = :symbol", symbol=stock_lookup) File "/usr/local/lib/python3.7/site-packages/cs50/sql.py", line 21, in decorator return f(*args, **kwargs) File "/usr/local/lib/python3.7/site-packages/cs50/sql.py", line 220, in execute tokens[index] = self._escape(kwargs[name]) File "/usr/local/lib/python3.7/site-packages/cs50/sql.py", line 460, in _escape return __escape(value) File "/usr/local/lib/python3.7/site-packages/cs50/sql.py", line 454, in __escape raise RuntimeError("unsupported value: {}".format(value))
RuntimeError: unsupported value: {'name': 'Apple, Inc.', 'price': 118.64, 'symbol': 'AAPL'} INFO:werkzeug:192.168.171.20 - - [20/Nov/2020 09:18:17] "POST /buy HTTP/1.0" 500 - INFO:werkzeug:192.168.171.20 - - [20/Nov/2020 09:18:18] "GET /static/styles.css HTTP/1.0" 200 -
