Separating models in Flask-SQLAlchemy to another file breaks PyDev import detection

StackOverflow https://stackoverflow.com/questions/21802552

Question

I am learning Flask and when I try to separate my app to more modules, for no apparent reason PyDev starts to report Undefined variable from import. However, the code still works.

First, I have added flask to Forced Builtins first so PyDev parses extensions dynamically. This way PyDev does not report flask.ext... imports.

Everything is fine with this setup:

templates/index.py

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html lang="en">
<head>
    <title>Test</title>
</head>
<body>
    <ul>
    {% for user in all_users %}
      <li>{{ user.username }}</li>
    {% endfor %}
    </ul>
</body>
</html>

main_old.py

from flask import Flask, render_template
from flask.ext.sqlalchemy import SQLAlchemy

db = SQLAlchemy()

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True)
    email = db.Column(db.String(120), unique=True)

    def __init__(self, username="", email=""):
        self.username = username
        self.email = email  

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = "sqlite:///test.db"
db.init_app(app)

@app.route("/")
def hello():
    db.drop_all()
    db.create_all()
    db.session.add(User("John Doe", "john.doe@example.com"))
    db.session.add(User("Bill Smith", "smith.bill@example.com"))
    db.session.commit()
    all_users = User.query.all()
    return render_template('index.html', all_users=all_users)

if __name__ == "__main__":
    app.run(debug=True)

Now I separate main_old.py into main.py and models.py like this:

models.py

from flask.ext.sqlalchemy import SQLAlchemy

db = SQLAlchemy()

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True)
    email = db.Column(db.String(120), unique=True)

    def __init__(self, username="", email=""):
        self.username = username
        self.email = email

main.py

from flask import Flask, render_template
from models import db, User

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = "sqlite:///test.db"
db.init_app(app)

@app.route("/")
def hello():
    db.drop_all()
    db.create_all()
    db.session.add(User("John Doe", "john.doe@example.com"))
    db.session.add(User("Bill Smith", "smith.bill@example.com"))
    db.session.commit()
    all_users = User.query.all()
    return render_template('index.html', all_users=all_users)

if __name__ == "__main__":
    app.run(debug=True)

It is equivalent, but I get Undefined variable from import: query on all_users = User.query.all() line. Why the PyDev import detection breaks like this? Why did it work in one file? Is there a way to fix this? Is there workaround other than @UndefinedVariable?

Was it helpful?

Solution

I still do not know why is this happening, but workaround exists.

Use recommended all_users = db.session.query(User).all() instead of all_users = User.all().

Licensed under: CC-BY-SA with attribution
Not affiliated with StackOverflow
scroll top