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

1 vote378 views1 answer
Create email address from first and last name in sql
SQL
0 vote371 views1 answer
Sql values that contains certain multiple ids
SQL
0 vote322 views2 answers
Return the number of records in a single table mysql
SQL
0 vote337 views2 answers
What is the default password for sql server sa
SQL
0 vote317 views1 answer
Select from 3 tables one is empty
SQL
25 votes413 views5 answers
Mysql replace text
SQL
0 vote337 views1 answer
Update one column from another column in same table
SQL
0 vote331 views1 answer
User defined variables in sql
SQL
0 vote331 views1 answer
Load utilities in sql server
SQL
0 vote337 views1 answer
Remove binlog mysql
SQL