Hi Im not able to reproduce this, though I will grant things dont seem to work very well in this area, would need to know *exactly* what it is you are trying to accomplish. please alter the MCVE below to reproduce your error, it passes for me however does have a warning:
from sqlalchemy import Column from sqlalchemy import create_engine from sqlalchemy import Integer from sqlalchemy import String from sqlalchemy.ext import automap from sqlalchemy.orm import Session _AutomapBase = automap.automap_base() class Model1(_AutomapBase): __tablename__ = "model1" id_ = Column( "id", Integer, primary_key=True, autoincrement=True, key="id_" ) tag = Column(String()) e = create_engine("sqlite://", echo=True) with e.connect() as conn: conn.execute("create table model1 (id integer primary key, tag varchar)") _AutomapBase.metadata.reflect(bind=e, only=["model1"], extend_existing=True) _AutomapBase.prepare() row = Model1(tag="tag1") s = Session(e) s.add(row) s.flush() On Sat, Aug 22, 2020, at 10:43 AM, 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 Example. 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