examples:
from sqlalchemy import func
project_list = ['platform', 'vip']
content = 'this is test text'
r = session.query(Project).filter(Project.name.in_(project_list))
r.update({'change_log': func.concat(Project.change_log, content)},
synchronize_session='fetch')
session.commit()
session.close()
r has two return objects, but only platform updates.Thanks.
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