I have three tables a(a query of a really), b, c
a has a 1-many relationship with b
c has a 1-many relationship with b
What I would like to do is in my mapper for table c, is sort the order
of rows from b by a.name.
I don't know how to do this or if it is possible. What I have looks like:
sql_a = select([table_a], table_a.c.col1='some value').alias('a_query')
mapper(B, b_table, properties = {
'A' : relation(sql_a, lazy=False,
primaryjoin=(sql_a.c.id==table_b.c.a_id))})
mapper(C, c_table, properties = {
'Bs' : relation(B, backref='C', cascade='all, delete-orphan',
order_by=[C.A.name, c_table.c.value1,
c_table.c.value2]),
})
This gets me an "AttributeError: 'InstrumentedAttribute' object has no
attribute 'name'"
I have also tried:
order_by=[A.name
and
order_by=[sql_a.c.name
both get me this: ProgrammingError: (ProgrammingError) missing
FROM-clause entry for table "sql_a.name"
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