Question

我正在尝试基于SQLite db在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

中初始化我的迁移类

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"期间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'

models.py的外观如下：

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，所有内容似乎都可以使用，但是，这是很多不必要的工作。您有什么建议为什么它会以这种方式工作？

UPD：添加了conf.py。根据导入的顺序，此操作在每个本地导入以及蓝图上都会失败。

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

我看到您已经解决了问题，但是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。您只需要删除与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：）

Answer 2

要解决您的问题，我建议您使用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：

struct Node{
    int key;
    Node *left, *right;
};

int NumNodes = 0;
const int SIZE = 100;
Node data[SIZE];


Node* newNode(int value){
  if(NumNodes == SIZE) {
    cout << "This Node Pool is full." << endl;
    exit(1);
  }

  Node* temp = &data[NumNodes++];
  temp->key  = value;                  
  temp->left = temp->right = NULL;     
  return temp;
}

要启动迁移，只需执行以下操作： from flask_migrate import Migrate, MigrateCommand from flask_script import Manager migrate = Migrate(app, db) manager = Manager(app) manager.add_command('db', MigrateCommand)或python manage.py db migrate（取决于您的PATH配置）

烧瓶迁移“ ModuleNotFoundError”

2 个答案: