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/
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