问题
I'm trying to make migrations on my Flask api based on SQLite db. Here is my project structure
├── app.py
├── blueprints
├── conf.py
├── db.sqlite
├── __init__.py
├── migrations
├── models.py
└── templates
Then i initialize my migrate class in the app.py
from flask import Flask, jsonify, request, render_template
from flask_sqlalchemy import SQLAlchemy
from conf import ErrorResponses, SuccessResponses
# initialization
app = Flask(__name__)
db = SQLAlchemy(app)
from models import User, db, BlackListToken
# extensions
from flask_migrate import Migrate
mig = Migrate(app, db)
But it fails on importing from custom modules while flask db migrate -m "rm id and made name/surname nullable"
.
Usage: flask db migrate [OPTIONS]
Error: While importing "api_flask.app", an ImportError was raised:
Traceback (most recent call last):
File "/usr/local/lib/python3.6/dist-packages/flask/cli.py", line 235, in locate_app
__import__(module_name)
File "/home/zahessi/all/bubbie_D/api_flask/app.py", line 9, in <module>
from conf import ErrorResponses, SuccessResponses
ModuleNotFoundError: No module named 'conf'
Here is how models.py
looks:
from app import db
class User(db.Model):
__tablename__ = 'users'
username = db.Column(db.String(32), index=True, unique=True, nullable=False)
email = db.Column(db.String(64), unique=True, nullable=False)
password_hash = db.Column(db.String(64), nullable=False)
name = db.Column(db.String(32))
surname = db.Column(db.String(32))
public_id = db.Column(db.String(32))
creation_date = db.Column(db.DateTime)
...
When I remove all imports from custom py files, all seems to work, however, this is a lot of unnecessary work. Do you have any suggestions why does it work in that way?
UPD: Added conf.py
. It fails on every local import, on blueprints as well, depending on the order of the imports.
from re import findall
class ErrorResponses:
usernameOrPasswordBlank = {
"success": False,
"error": "Username and password cannot be blank."
}
userAlreadyExists = {"success": False, "error": "Such user already exists"}
incorrectData = {
"success": False,
"error": "Incorrect username or password"
}
invalidData = {
"success": False,
"error": "Username or password is invalid"
}
noUser = {
"success": False,
"error": "There is no user with such username or public_id"
}
...
回答1:
To solve your problem I will suggest using flask_script instead flask cli. Simply create manage.py file in your root directory and then do as follows:
from flask_migrate import Migrate, MigrateCommand
from flask_script import Manager
migrate = Migrate(app, db)
manager = Manager(app)
manager.add_command('db', MigrateCommand)
To launch migration simply do:
python manage.py db migrate
or python3 manage.py migrate
(depends on your PATH configuration)
回答2:
I can see that you solved the problem, but I want to show you the simpler solution than installing flask-script
and creating manage.py
file. You just have to delete __init__.py
file that is at the same level as app.py file. It solved the problem for me. Cheers :)
来源:https://stackoverflow.com/questions/51925284/flask-migrate-modulenotfounderror