Hi everyone!
I'm new to SQLAlchemy and I'm using version 0.5rc1..
I need every entity class to have a few common fields, so I tried
writing an "abstract" base class, declarative-style, that every other
entity class would subclass. So for example:
---
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, String, DateTime, Integer
ORMBase = declarative_base()
class BaseObject(ORMBase):
id = Column(Integer, primary_key=True)
creation_time = Column(DateTime)
modify_time = Column(DateTime)
class TestEntity(BaseObject):
value = Column(String)
---
But SQLAlchemy complains that
sqlalchemy.exc.ArgumentError: Mapper 'Mapper|BaseObject|None' does not
have a mapped_table specified. (Are you using the return value of
table.create()? It no longer has a return value.)
Is there a way to tell SQLAlchemy to treat BaseObject like a non-
mapped-class? I tried using ORMBase as mixin to TestEntity (so
BaseObject extends object and TestEntity extends BaseObject and
ORMBase), but now I get a
sqlalchemy.exc.ArgumentError: Mapper Mapper|TestEntity|tests could not
assemble any primary key columns for mapped table 'tests'
so I guess that maybe I'm going down the wrong road.. Am I doing
something that Declarative doesn't like? :) Should I try Elixir
instead?
Many thanks for your time!
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