Many to many flask-sqlalchemy

association_table = db.Table('association', db.Model.metadata,
    db.Column('left_id', db.Integer, db.ForeignKey('left.id')),
    db.Column('right_id', db.Integer, db.ForeignKey('right.id'))
)

class Parent(db.Model):
    __tablename__ = 'left'
    id = db.Column(db.Integer, primary_key=True)
    children = db.relationship("Child",
                    secondary=association_table)

class Child(db.Model):
    __tablename__ = 'right'
    id = db.Column(db.Integer, primary_key=True)


p = Parent()
c = Child()
p.children.append(c)
db.session.add(p)
db.session.commit()

Source: stackoverflow.com

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()

Source: stackoverflow.com

Similar codes

0 vote304 views1 answer
Transaction database with php
SQL
18 votes302 views6 answers
Creating table in MySQL
SQL
0 vote286 views1 answer
Laravel general error 2006 mysql server has gone away
SQL
0 vote316 views1 answer
Mysql config address
SQL
0 vote320 views1 answer
Oracle to_number
SQL
4 votes313 views1 answer
Conda install sqlalchemy
SQL
2 votes308 views2 answers
Storing timezones in postgres
SQL
1 vote306 views1 answer
Mysql strict_trans_tables
SQL
6 votes299 views2 answers
Find mysql version linux
SQL
0 vote252 views2 answers
Https://www.google.com/search?ei=bihqX_v9DJb--gTYoLH4DQ
SQL