Please note, that I posted, then deleted a message with the same subject in
order to correct some relevant information, and this post replaces the one
I deleted.
On Saturday, August 22, 2020 at 7:43:42 AM UTC-7 Vitaly Kruglikov wrote:
> Dear all,
>
> I am using:
> sqlalchemy==1.3.18
> psycopg2==2.8.4
> connection url schema: "postgresql+psycopg2://..."
> postgres 10.x
>
>
> My code looks like this:
>
> ```
> _AutomapBase = automap.automap_base()
>
> class Model1(_AutomapBase):
> __tablename__ = 'model1"
>
> id_ = sa.Column('id', sa.Integer, primary_key=True, autoincrement=True,
> key='id_')
> tag = sa.Column(sa.String())
>
> _AutomapBase.metadata.reflect(bind=ENGINE, only=['model1'],
> extend_existing=True)
> _AutomapBase.prepare()
>
> row = Model1(tag='tag1')
> orm_session.add(attempt)
> orm_session.flush()
> ```
>
> I get the exception `ArgumentError: Only one Column may be marked
> autoincrement=True, found both id and id.` when I run the following insert:
> ```
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/orm/session.py",
> line 2523, in flush
> self._flush(objects)
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/orm/session.py",
> line 2664, in _flush
> transaction.rollback(_capture_exception=True)
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/util/langhelpers.py",
>
> line 68, in __exit__
> compat.raise_(
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/util/compat.py",
> line 178, in raise_
> raise exception
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/orm/session.py",
> line 2624, in _flush
> flush_context.execute()
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/orm/unitofwork.py",
>
> line 422, in execute
> rec.execute(self)
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/orm/unitofwork.py",
>
> line 586, in execute
> persistence.save_obj(
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/orm/persistence.py",
>
> line 239, in save_obj
> _emit_insert_statements(
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/orm/persistence.py",
>
> line 1135, in _emit_insert_statements
> result = cached_connections[connection].execute(
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/engine/base.py",
> line 1014, in execute
> return meth(self, multiparams, params)
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/elements.py",
>
> line 298, in _execute_on_connection
> return connection._execute_clauseelement(self, multiparams, params)
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/engine/base.py",
> line 1108, in _execute_clauseelement
> compiled_sql = elem.compile(
> File "<string>", line 1, in <lambda>
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/elements.py",
>
> line 476, in compile
> return self._compiler(dialect, bind=bind, **kw)
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/elements.py",
>
> line 482, in _compiler
> return dialect.statement_compiler(dialect, self, **kw)
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/compiler.py",
>
> line 590, in __init__
> Compiled.__init__(self, dialect, statement, **kwargs)
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/compiler.py",
>
> line 319, in __init__
> self.string = self.process(self.statement, **compile_kwargs)
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/compiler.py",
>
> line 350, in process
> return obj._compiler_dispatch(self, **kwargs)
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/visitors.py",
>
> line 95, in _compiler_dispatch
> return meth(self, **kw)
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/compiler.py",
>
> line 2427, in visit_insert
> crud_params = crud._setup_crud_params(
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/crud.py",
> line 64, in _setup_crud_params
> return _get_crud_params(compiler, stmt, **kw)
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/crud.py",
> line 158, in _get_crud_params
> _scan_cols(
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/crud.py",
> line 346, in _scan_cols
> _append_param_insert_pk_returning(
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/crud.py",
> line 457, in _append_param_insert_pk_returning
> elif c is stmt.table._autoincrement_column or c.server_default is not
> None:
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/schema.py",
> line 779, in _autoincrement_column
> return self.primary_key._autoincrement_column
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/util/langhelpers.py",
>
> line 883, in __get__
> obj.__dict__[self.__name__] = result = self.fget(obj)
> File
> "/tmp/empower-wf-venv/lib/python3.8/site-packages/sqlalchemy/sql/schema.py",
> line 3706, in _autoincrement_column
> raise exc.ArgumentError(
> sqlalchemy.exc.ArgumentError: Only one Column may be marked
> autoincrement=True, found both id and id.
> ```
>
> I suspect this has something to do with the combination of the explicit
> definition of the `id_` column and reflection, but don't know how to fix. I
> really need to keep the explicit `id_` descriptor and shouldn't rename it
> to `id` because that's a reserved python word.
>
> In fact, when I check members of the Model, I see `extend_existing` added
> `id` even though `id_` was already defined to represent the actual column
> named `id`:
> ```
> In [7]: dir(Model1)
> Out[7]:
> [
> 'classes',
> 'id',
> 'id_',
> 'prepare',
> ...
> ]
> ```
>
> Please help. Many thanks in advance!
>
--
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
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