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Python Flask with SQLAlchemy Basics Connecting to a Database with SQLAlchemy SQLAlchemy and Flask

Posted by amandae
amandae
15,727 Points

ERROR FIX: flask_sqlalchemy - track modifications feature deprecation

Hi, all.

Just a head's up.

flask_sqlalchemy has deprecated the track modification feature. In the past it was set to "True", but now it is set to "None." My code continued to give error codes until I set it to either "True" or "False." (Thank you, Stack Overflow.)

models.py

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
import datetime


app = Flask(__name__)
# ***********line below needs to be added in this spot****************
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
#********************************************************************
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///pets.db'
db = SQLAlchemy(app)


class Pet(db.Model)

If you watch closely, you can actually see a warning for this come up in the video, but the teacher's code runs despite the warning. Mine didn't.

2 Answers