flask-sqlalchemy

问题 This question already has an answer here : Accessing a mixin member variable (column) from the child (1 answer) Closed last year . How do I access id from my child class? class BaseClass: id = 'testing' class MyClass(BaseClass): something = id More specifically, I can't access id from class:User : class BaseModel: id = db.Column(db.Integer, primary_key=True) class User(db.Model, BaseModel): username = db.Column(db.String(35), nullable=False, unique=True) followed = db.relationship( 'User',

问题 I've a question related to Flask-migrate. I'm creating a set of web services with Flask. I've split each web service in his own package in a python application. The application structure look like this: MyApp WS1 models.py WS2 models.py CommonPackage models.py How can I import all the modules and init the db? I've tried to import them all manually but is not working. I know that it works if I import the "app" from WS1 or Ws2 separately, but I would like to do this in a single operation, is

问题 With this simplified model: class User(db.Model): id = db.Column(db.Integer, primary_key=True) # other attributes #user many-to-many size associations (using link tables) sz_shirt_dress_sleeve = db.relationship( 'SizeKeyShirtDressSleeve', secondary=LinkUserSizeShirtDressSleeve, backref=db.backref('users', lazy='dynamic')) strange = {'whyisthisdifferent': db.relationship( 'SizeKeyShirtDressNeck', secondary=LinkUserSizeShirtDressNeck, backref=db.backref('users', lazy='dynamic'))} I would assume

问题 i tried to implement a simple sqlalchemy table relationship so, I have below model: class User(db.Model): __tablename__ = "users" UserID = db.Column(db.Integer, primary_key=True, autoincrement=True) FirstName = db.Column(db.String(255), nullable=False) LastName = db.Column(db.String(255), nullable=False) #others column Tokens = db.relationship('Token', backref='Token.UserID', primaryjoin='User.UserID==Token.UserID', lazy='dynamic') #bla... other codes and class Token(db.Model): __tablename__

问题 I am attempting to create a one to many polymorphic relationship in flask/sqlalchemy. The concept is to provide temporary to certain data using an authorizations table. The table will have two fields, authorizable_id and authorizable_type. The authorizable_id refers to the id of the entry it is referring to. It is not a foreign key as it can refer to different tables. The authorizable_type determines which table it is referring to. For example, for a file, it is 'FILE'. I've seen how to do

问题 I'm in the process of migrating hosts, and the new hosts uses a newer version of MySQL which is stricter about the format of datetime values it accepts. I know that I can turn this off, but I'd like to find a solution to properly convert these values to the correct format. Preferably one that can be easily swapped out across the many models I need to update (100 or so). If I can't find a way to update this on the model level, I may have to hunt down the thousands of locations where these

问题 I'm using an sqlite3 database to record data every second. The interface to it is provided by Flask-SQLAlchemy. This can work fine for a couple of months, but eventually (as the .db file approaches 8 GB), an error prevents any more data from being written to the database: Failed to commit: (sqlite3.OperationalError) disk I/O error The journal file does not seem to be the issue here - if I restart the application and use the pragma journal_mode=TRUNCATE , the journal file is created but the

问题 I'm managing database migrations with Alembic and would like to use the default files generated by alembic init without any modifications to env.py (e.g., setting target_metadata) or alembic.ini (e.g., setting sqlalchemy.url) to manage migrations of my database from scripts. For example, I'd like to use a command based script like the following: import os from alembic.config import Config from alembic import command from myapp import db alembic_cfg = Config(os.path.join(os.path.abspath(os

问题 For some reason when I'm using SQLAlchemy's union_all and .all() , it's returning the incorrect number of items. As you can see below, I broke each one down to see where the error was. Does anyone have any idea why this would be happening? >>> pn = PostNotification.query.filter_by(notified_id=1) >>> cn = CommentNotification.query.filter_by(notified_id=1) >>> pn.count() 4 >>> cn.count() 2 >>> u = pn.union_all(cn) >>> u.count() 6 >>> all = u.all() >>> len(all) 5 Here are my two models: class

问题 This code is supposed to update a post in the database that matches 'post_id'. But it updates every post in the table. The code has been edited so it works correctly. @app.route('/update/<post_id>', methods=['GET', 'POST']) def update(post_id): if 'username' not in session: return redirect(url_for('login')) post = Post.query.get(post_id) form = PostForm(obj=post) if request.method == 'POST': if form.validate() == False: return render_template('update.html', form=form) else: Post.query.filter