Hi there, I just started to learn SQLAlchemy. 0
<https://stackoverflow.com/posts/70266906/timeline>
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
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