问题描述
我是蓝图的新手，在将 db 导入模型文件 mydatabase.py 文件时遇到问题.
I'm new in bluprint, and have problem with importing db into mydatabase.py file which is models file.
我遇到了这个错误:
导入错误:无法导入名称 'db'
我的项目树
nikoofar/
run.py
bookshelf/
__init__.py
mydatabase.py
main/
controllers.py
__init__.py
运行.py
from bookshelf import app
if __name__ == '__main__':
app.run(debug=True, port=8000)
书架/intit.py
from flask import Flask
from bookshelf.main.controllers import main
from flask_sqlalchemy import SQLAlchemy
from mydatabase import pmenu
app = Flask(__name__, instance_relative_config=True)
db = SQLAlchemy(app)
db.init_app(app)
application.config['SQLALCHEMY_DATABASE_URI'] = 'mysql+pymysql://username:password@localhost/databasename'
app.config.from_object('config')
app.register_blueprint(main, url_prefix='/')
书架/主/控制器.py
bookshelf / main / controllers.py
from flask import Blueprint
from bookshelf.mydatabase import *
from flask_sqlalchemy import SQLAlchemy
main = Blueprint('main', __name__)
@main.route('/')
def index():
g = pmenu.query.all()
print (g)
return "ok"
问题又回到了from bookshelf import db，如果我把那个删掉，错误会变成:
The problem backs to from bookshelf import db, and if I delete that, the error will be changed to:
导入错误:无法导入名称 'db'
书架/mydatabase.py
bookshelf / mydatabase.py
from bookshelf import db
class pmenu(db.Model):
__tablename__ = 'p_menu'
id = db.Column(db.Integer, primary_key=True)
txt = db.Column(db.String(80), unique=True)
link = db.Column(db.String(1024))
def __init__(self, txt, link):
self.txt = txt
self.link = link
def __repr__(self):
return "{'txt': " + self.txt + ", 'link':" + self.link + "}"
有什么解决办法吗?
推荐答案
这实际上是一个简单但令人沮丧的问题.问题是您正在导入 main BEFORE 您正在__init__.py
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
如果将导入移动到 db = SQLAlchemy(app) 之后，它将起作用:
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='/')
这篇关于烧瓶-蓝图-sqlalchemy-无法将名称“db"导入到moles文件中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！