您不需要直接在关联表中添加任何内容，sqlAlchemy会这样做。这或多或少来自SQLAlchemy文档：
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()
因此，您的示例将如下所示：
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()
602392714
清零编程群