Re: [sqlalchemy] Re: How to add the index_elements to the on_conflict_do_update() method

[Simon King]

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  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
>
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> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
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The Python SQL Toolkit and Object Relational Mapper

http://www.sqlalchemy.org/

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[sqlalchemy] Re: How to add the index_elements to the on_conflict_do_update() method

[Chaozy Z]

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.
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