flask-sqlalchemy

I am joining two models without a foreign key: Models: class Users(db.Model): __tablename__ = "Users" userName = db.Column(db.String, primary_key=True) lastLogin = db.Column(db.DateTime) class TimeOff __tablename__ = "timeOff" timeOffID = db.Column(db.Integer, primary_key=True) userName = db.Column("userName", db.String, db.ForeignKey('appUsers.userName')), dayWork = db.Column(db.DateTime) View: result = db.session.query(models.Users).join(models.TimeOff) sqlalchemy.exc.InvalidRequestError: Could not find a FROM clause to join from. Tried joining to but got: Can't find any foreign key

I would like to do some handler for exception. I'm using a combination of Flask-restless and SQLAlchemy in python. My problem: When I send request to api with object that already exists in DB, SQLAlchemy shows exception: IntegrityError: (IntegrityError) column <column_name> is not unique u'INSERT INTO ... So I have tried to add attribute validation_exceptions into create_api method: manager.create_api( ... , validation_exceptions=[IntegrityError]) But response json contains: { "validation_errors": "Could not determine specific validation errors" } and server api shows exception : Traceback

I have two foreign keys in an entity refering to another entity. Here is how it looks class Review(db.Model): __tablename__ = 'Review' id = db.Column(db.Integer, primary_key = True) user_id = db.Column(db.Integer, db.ForeignKey('User.id'), nullable=False) business_user_id = db.Column(db.Integer, db.ForeignKey('User.id'), nullable=False) user = db.relationship('User', foreign_keys=[user_id]) business_user = db.relationship('User', foreign_keys=[business_user_id]) and class User(db.Model): __tablename__ = 'User' id = db.Column(db.Integer, primary_key = True) reviews = db.relationship('Review',

I'm trying to make this many-to-many join work with Flask-SQLAlchemy and two MySQL databases, and it's very close except it's using the wrong database for the join table. Here's the basics... I've got main_db and vendor_db . The tables are setup as main_db.users , main_db.user_products (the relation table), and then vendor_db.products . Should be pretty clear how those are all connected. in my app.py, I'm seting up the databases like this: app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://user:pass@localhost/main_db' app.config['SQLALCHEMY_BINDS'] = { 'vendor_db': 'mysql://user:pass@localhost

I have User which has-one Person . So User.person is a Person . I am trying to get a list of User from a list of Person . I tried the following: >>> people = Person.query.filter().limit(3) <flask_sqlalchemy.BaseQuery object at 0x111c69bd0> >>> User.query.filter(User.person.in_(people)).all() NotImplementedError: in_() not yet supported for relationships. For a simple many-to-one, use in_() against the set of foreign key values. What is the best way to get a list of User s where User.person is in that list of people ? As the error message helpfully tells you, you need to use in_ against the

I have a four classes like so: Group , Parent , Child , Toy . Group has a parents relationship pointing to Parent Parent has a children relationship pointing to Child Child has a toys relationship pointing to Toy Parent has a toys association_proxy that produces all the Toy s that the Parent 's children have. I want to be able to get all the Toys in a Group. I tried to create an association_proxy on Group that links to Parent 's toys , but it produces this: [[<Toy 1>, <Toy 2>], [], [], []] when I want this: [<Toy 1>, <Toy 2>] If the Parent 's children don't have any Toy s, then the toys

I am a little confused with the topic alluded to in the title. So, when a Flask app is started, does the SQLAlchemy search the SQLALCHEMY_DATABASE_URI for the correct, in my case, MySQL database. Then, does it create the tables if they do not exist already? What if the database that is programmed into the SQLALCHEMY_DATABASE_URI variable in the config.py file does not exist? What if that database exists, and only a few of the tables exist (There are more tables coded into the SQLAlchemy code than exist in the actual MySQL database)? Does it erase those tables and then create new tables with