Does the table definition in postgres match your SQLAlchemy definition? Adding "unique=True" to the SQLAlchemy table definition will not automatically add an index to an existing table in the database.
If you connect to the database using "psql" and run "\d message_symbol", does it show the primary key and/or unique index? Simon On Tue, Dec 7, 2021 at 10:27 PM Chaozy Z <chaozyh...@gmail.com> wrote: > > I also tried to add unique=True to the column message_id but still fail with > the same error > > On Tuesday, 7 December 2021 at 22:21:49 UTC Chaozy Z wrote: >> >> Hi there, I just started to learn SQLAlchemy. 0 >> >> I have a `on_conflict_do_update` command as follows: >> >> ``` >> >> insert_stmt = insert(MessageSymbol).values(message_id=12345, symbol_id=1) >> >> do_update_stmt = insert_stmt.on_conflict_do_update( >> index_elements=['message_id'], set_=dict( symbol_id=123 ) ) >> >> ``` >> >> and my MessageSymbol is defined as follow: >> >> ``` >> >> class MessageSymbol(Base): >> >> __tablename__ = "message_symbol" >> >> >> message_id = Column(BigInteger, primary_key=True, nullable=False) >> >> >> symbol_id = Column(BigInteger, nullable=False) >> >> ``` >> >> When the command is executed it throws the error: >> >> ``` >> >> sqlalchemy.exc.ProgrammingError: (psycopg2.errors.InvalidColumnReference) >> there is no unique or exclusion constraint matching the ON CONFLICT >> specification >> >> [SQL: INSERT INTO message_symbol (message_id, symbol_id) VALUES >> (%(message_id)s, %(symbol_id)s) ON CONFLICT (message_id) DO UPDATE SET >> symbol_id = %(param_1)s] >> [parameters: {'message_id': 12345, 'symbol_id': 1, 'param_1': 123}] >> >> ``` >> >> Since I have defined the `message_id` as the primary key I assume it should >> be a unique constraint. I am wondering what else is being missing? >> >> Chaozy > > -- > 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 Example. See http://stackoverflow.com/help/mcve for a full > description. > --- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sqlalchemy/734ae718-fde8-4b54-9de9-b2d81698a0dfn%40googlegroups.com. -- 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 Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/CAFHwexem_JXPsNS_1_rqCPb1FS8MFLViMt0C3q_1gctD7SFrOw%40mail.gmail.com.