I'd like to be able to map read-only attributes based on a join, but
without mapping the class to a joined table.
----
Given this structure:
class unit:
pass
class recsite:
pass
units = Table('units',metadata,
Column('unit_id',Integer,
primary_key=True,nullable=False),
Column('recsite_id',Integer,
ForeignKey(recsites.c.recsite_id),
nullable=False))
recsites = Table('recsites',metadata,
Column('recsite_id',Integer,
primary_key=True,nullable=False),
Column('depth',Integer,nullable=False))
mapper(unit,units)
mapper(recsite,recsites)
----
Is there a way to map a 'depth' property for unit, without mapping
unit to units.join(recsites)? I tried adding a ColumnProperty to the
mapper, but while it succeeds, it returns the wrong value:
mapper(unit,units,
properties={'depth':ColumnProperty(recsites.c.depth)})
I can't find anything in the documentation for ColumnProperty that
tells me how to specify the join condition.
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