cannot catch SQLAlchemy IntegrityError

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I have the same need in my Flask application, I handle it like below and it works:

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy import exc

db = SQLAlchemy(Flask(__name__))

try:
     db.session.add(resource)
     return db.session.commit()
except exc.IntegrityError:
     db.session.rollback()

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