Fantastic, thanks! On Tuesday, April 14, 2015 at 4:00:01 PM UTC+1, Michael Bayer wrote: > > > > On 4/14/15 6:38 AM, Steven Winfield wrote: > > Hi, > > I think I've found a bug triggered by bulk deletes that use the > (default) "evaluate" strategy. > > > a bug is created at > https://bitbucket.org/zzzeek/sqlalchemy/issue/3365/evaluator-cant-locate-orm-entity-when > > and for now you need to compare using the columns, not the relationship, > e.g. Child._id_parent == parent.id, if you want to use evaluate there. > > > > For example: > > from sqlalchemy import Column, Integer, Text, ForeignKey, create_engine > from sqlalchemy.ext.declarative import declarative_base > from sqlalchemy.orm import sessionmaker, relationship > > Base = declarative_base() > > class Parent(Base): > __tablename__ = "parent" > id = Column(Integer, primary_key=True) > > class Child(Base): > __tablename__ = "child" > _id_parent = Column("id_parent", Integer, ForeignKey(Parent.id), > primary_key=True) > name = Column(Text, primary_key=True) > parent = relationship(Parent) > > engine = create_engine('sqlite://') > Base.metadata.create_all(engine) > Session = sessionmaker(bind=engine) > session = Session() > session.bind.echo = True > > # Make a parent > p = Parent(id=1) > session.add(p) > session.commit() > > # Add a child > c = Child(name="foo", parent=p) > session.add(c) > session.commit() > # c is still in the session > > session.query(Child).filter(Child.parent == p).delete("evaluate") > > ...give the following traceback: > > File user!winfis!test_bed.py, line 34, in : > session.query(Child).filter(Child.parent == p).delete("evaluate") > File > R:\sw\external\20150407-0\python27\lib\site-packages\sqlalchemy-0.9.7-py2.7-win32.egg\sqlalchemy\orm\query.py, > > line 2670, in delete : delete_op.exec_() > File > R:\sw\external\20150407-0\python27\lib\site-packages\sqlalchemy-0.9.7-py2.7-win32.egg\sqlalchemy\orm\persistence.py, > > line 896, in exec_ : self._do_pre_synchronize() > File > R:\sw\external\20150407-0\python27\lib\site-packages\sqlalchemy-0.9.7-py2.7-win32.egg\sqlalchemy\orm\persistence.py, > > line 958, in _do_pre_synchronize : eval_condition(obj)] > File > R:\sw\external\20150407-0\python27\lib\site-packages\sqlalchemy-0.9.7-py2.7-win32.egg\sqlalchemy\orm\evaluator.py, > > line 116, in evaluate : right_val = eval_right(obj) > File > R:\sw\external\20150407-0\python27\lib\site-packages\sqlalchemy-0.9.7-py2.7-win32.egg\sqlalchemy\orm\evaluator.py, > > line 72, in : return lambda obj: get_corresponding_attr(obj) > AttributeError: 'Child' object has no attribute 'id_parent' > > > ...because the attribute lookup on Child is attempted using the column > name, rather than the attribute name. The actual delete action works fine > when I switch the strategy to False or "fetch", or if there are no Child > objects in the session (so no evaluation is invoked). > > > As you can see, this is v0.9.7, but I've not seen anything relevant in > the changelog since then. > > Cheers, > Steve. > -- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+...@googlegroups.com <javascript:>. > To post to this group, send email to sqlal...@googlegroups.com > <javascript:>. > Visit this group at http://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. > > >
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