Flask 迁移 "ModuleNotFoundError"

Question

我正在尝试基于 SQLite 数据库在我的 Flask api 上进行迁移。这是我的项目结构

├── app.py
├── blueprints
├── conf.py
├── db.sqlite
├── __init__.py
├── migrations
├── models.py
└── templates

然后我在 app.py

中初始化我的迁移 class

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)

但是在 flask db migrate -m "rm id and made name/surname nullable".

时从自定义模块导入失败

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'

这是 models.py 的样子：

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)
    ...

当我从自定义 py 文件中删除所有导入时，一切似乎都有效，但是，这是很多不必要的工作。你有什么建议为什么它以这种方式工作？

UPD：添加了 conf.py。它在每次本地导入时都会失败，在蓝图上也会失败，具体取决于导入的顺序。

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"
    }
    ...

Answer 1

为了解决您的问题，我建议使用 flask_script 而不是 flask cli。只需在您的根目录中创建 manage.py 文件，然后执行以下操作：

from flask_migrate import Migrate, MigrateCommand
from flask_script import Manager
migrate = Migrate(app, db)
manager = Manager(app)
manager.add_command('db', MigrateCommand)

要启动迁移，只需执行以下操作： python manage.py db migrate 或 python3 manage.py migrate（取决于您的 PATH 配置）

Answer 2

我知道您已经解决了问题，但我想向您展示比安装 flask-script 和创建 manage.py 文件更简单的解决方案。您只需删除与 app.py 文件处于同一级别的 __init__.py 文件。它为我解决了问题。干杯:)

Flask 迁移 "ModuleNotFoundError"

Flask-Migrate "ModuleNotFoundError"

python

database

flask

importerror

migrate