dosubot[bot] commented on issue #29582:
URL: https://github.com/apache/superset/issues/29582#issuecomment-2226810870
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To resolve the error "relation 'ab_user' does not exist" when trying to
connect to another schema using SQLAlchemy, you need to ensure that the schema
is correctly specified in your SQLAlchemy connection string or in your query.
The `ab_user` table is part of the schema used by Apache Superset, and if you
are connecting to a different schema, you need to reference it properly.
Here is an example of how you can specify the schema in your SQLAlchemy
connection:
```python
from sqlalchemy import create_engine, MetaData, Table
# Example connection string with schema specified
engine = create_engine('postgresql://user:password@localhost/dbname')
# Reflect the tables from the specified schema
metadata = MetaData(schema='your_schema_name')
ab_user_table = Table('ab_user', metadata, autoload_with=engine)
# Now you can use the ab_user_table for your queries
with engine.connect() as connection:
result = connection.execute(ab_user_table.select())
for row in result:
print(row)
```
In this example, replace `'your_schema_name'` with the actual schema name
where the `ab_user` table resides. This ensures that SQLAlchemy looks for the
`ab_user` table in the correct schema.
Additionally, ensure that the `ab_user` table and its related tables are
correctly defined in your schema. For example, in Apache Superset, the
`ab_user` table is referenced in various other tables such as `sqlatable_user`
and `druiddatasource_user`:
```python
sqlatable_user = sa.Table(
"sqlatable_user",
sa.MetaData(),
sa.Column("id", sa.Integer, primary_key=True),
sa.Column("user_id", sa.Integer, sa.ForeignKey("ab_user.id")),
sa.Column("table_id", sa.Integer, sa.ForeignKey("tables.id")),
)
druiddatasource_user = sa.Table(
"druiddatasource_user",
sa.MetaData(),
sa.Column("id", sa.Integer, primary_key=True),
sa.Column("user_id", sa.Integer, sa.ForeignKey("ab_user.id")),
sa.Column("datasource_id", sa.Integer, sa.ForeignKey("datasources.id")),
)
```
Make sure that these relationships are properly set up in your database
schema to avoid any issues with missing relations
<sup>[[1]](https://github.com/apache/superset/blob/master/scripts/erd/erd.puml)</sup><sup>[[2]](https://github.com/apache/superset/blob/master/superset/migrations/versions/2018-12-15_12-34_3e1b21cd94a4_change_owner_to_m2m_relation_on_.py)</sup>.
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