On Nov 16, 2013, at 4:08 PM, Jon Nelson jnel...@jamponi.net wrote:
I've been experiencing a weirdness.
Using SQLAlchemy 0.8.3 and PostgreSQL with declarative (and deferred
reflection), if I don't manually force a reflection *before* I call
prepare then - when I use certain objects - I get an error which
indicates that SQLAlchemy did not reflect secondary tables. Is this a
known issue? It's really hard to find an isolated test case.
that actually sounds like a real issue / missing feature since I’m not
recalling prepare() is going to hit the “secondary” tables also.
it should be easy to reproduce….(let’s see)….sure, simple. this includes a
workaround. a new ticket with a patch is at
http://www.sqlalchemy.org/trac/ticket/2865
from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.ext.declarative import declarative_base, DeferredReflection
Base = declarative_base(cls=DeferredReflection)
class A(Base):
__tablename__ = 'a'
bs = relationship(B, secondary=atob)
class B(Base):
__tablename__ = 'b'
e = create_engine(sqlite://, echo=True)
e.execute(
create table a(id integer primary key)
)
e.execute(
create table b(id integer primary key)
)
e.execute(
create table atob(
a_id integer references a(id),
b_id integer references b(id),
primary key (a_id, b_id)
)
)
Base.prepare(e)
# if this isn't done, failure
#Table('atob', Base.metadata, autoload=True, autoload_with=e)
print A.bs.__clause_element__()
InvalidRequestError: When initializing mapper
Mapper|ObjectOne|table_one, expression 'table_one_secondary_table'
failed to locate a name (name 'table_one_secondary_table' is not
defined). If this is a class name, consider adding this
relationship() to the class 'ObjectOne class after both dependent
classes have been defined.
the table 'table_one_secondary_table' is like this:
class ObjectOne(Base):
__tablename__ = 'table_one'
object_twos = relationship(
ObjectTwo, backref='object_one',
cascade=save-update,merge,refresh-expire,expunge,
secondary='table_one_secondary_table',
passive_deletes=True
)
--
Jon
Software Blacksmith
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