It seems that both options don't work in common:
dates = Table('dates', meta,
Column('date', Date, primary_key=True)
)
mapper(MyDate, dates, column_prefix='_', properties=dict(
date = synonym('_date'),
)
produces with 0.3.8:
ArgumentError: WARNING: column 'date' not being added due to property
'<sqlalchemy.orm.interfaces.SynonymProperty object at 0x8ec91ac>'.
Specify 'allow_column_override=True' to mapper() to ignore this
condition.
I don't want override. My underlying goal is to make MyDate readOnly.
As mapped attributes are already properties, it would be great to be
able to
'declare' the readonly behaviour in the mapper.
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