changing the "key" of a column during reflection is not a process that's ever
been supported before. you would be better off using a synonym here:
from sqlalchemy.orm import Session, synonym
_AutomapBase = automap.automap_base()
class Model1(_AutomapBase):
__tablename__ = "model1"
id_ = synonym("id")
tag = Column(String())
On Sat, Aug 22, 2020, at 12:14 PM, Mike Bayer wrote:
> 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. See http://stackoverflow.com/help/mcve for a full
>> description.
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>
>
> --
> 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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>
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--
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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