db.relationship sqlalchemy flask
class Person(db.Model):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(50), nullable=False)
addresses = db.relationship('Address', backref='person', lazy=True)
class Address(db.Model):
id = db.Column(db.Integer, primary_key=True)
email = db.Column(db.String(120), nullable=False)
person_id = db.Column(db.Integer, db.ForeignKey('person.id'),
nullable=False)many to many flask-sqlalchemy
student_identifier = db.Table('student_identifier',
db.Column('class_id', db.Integer, db.ForeignKey('classes.class_id')),
db.Column('user_id', db.Integer, db.ForeignKey('students.user_id'))
)
class Student(db.Model):
__tablename__ = 'students'
user_id = db.Column(db.Integer, primary_key=True)
user_fistName = db.Column(db.String(64))
user_lastName = db.Column(db.String(64))
user_email = db.Column(db.String(128), unique=True)
class Class(db.Model):
__tablename__ = 'classes'
class_id = db.Column(db.Integer, primary_key=True)
class_name = db.Column(db.String(128), unique=True)
students = db.relationship("Student",
secondary=student_identifier)
s = Student()
c = Class()
c.students.append(s)
db.session.add(c)
db.session.commit()Copyright © 2021 Codeinu
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