class Paper(db.Model):
__tablename__ = 'papers'
reviewers = db.relationship('User', secondary=paper_reviewer,
backref=db.backref('papers_reviewed',
lazy='dynamic'),
lazy='dynamic')
paper_reviewer = db.Table('paper_reviewer',
db.Column('user_id', db.Integer,
db.ForeignKey('users.id'),
primary_key=True),
db.Column('paper_id', db.Integer,
db.ForeignKey('papers.id'),
primary_key=True)
)
@event.listens_for(Paper.reviewers, 'append')def paper_reviewers_append(target,
value, initiator):
# select queries...
paper.reviewers.append(usr)
db.session.add(paper)
db.session.commit()
The listener is fired before the execution of paper.reviewers.append(usr). The
execution of append makes two insertions into paper_reviewer table. The second
one causes IntegrityError: UNIQUE constraint failed.
I tried different operations in the listener. If the operation in listener
triggered any query, the IntegrityError would be caused while the commit() was
executed. Not sure why listener could cause this error. Can anyone give me some
details? Plz
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
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