flask - blueprint - sqlalchemy - cannot import name 'db' into moles file

Question

I\'m new in bluprint, and have problem with importing db into mydatabase.py file which is models file.

I\'ve faced with this error:

ImportErro

Answer 1

This is actually a simple, yet frustrating issue. The problem is you are importing main BEFORE you are creating the instance of db in your __init__.py

If move the import to after your db = SQLAlchemy(app), it will work:

from flask import Flask

from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql+pymysql://uername:password@localhost/test'

db = SQLAlchemy(app)

from bookshelf.main.controllers import main #<--move this here

app.register_blueprint(main, url_prefix='/')