session.query(Parent).options(defaultload("children").load_only("cheap_column"))
or really if you want to cut out "expensive_column" session.query(Parent).options(defaultload("children").defer("expensive_column")) http://docs.sqlalchemy.org/en/rel_0_9/orm/mapper_config.html#deferred On May 10, 2014, at 6:39 PM, Seth <seedifferen...@gmail.com> wrote: > Is there any way to get SQLAlchemy to only load specific columns through a > relationship()? > > For example, with this scenario: > > class Parent(Base): > __tablename__ = 'parent' > id = Column(Integer, primary_key=True) > children = relationship("Child", lazy='joined') > > class Child(Base): > __tablename__ = 'child' > id = Column(Integer, primary_key=True) > parent_id = Column(Integer, ForeignKey('parent.id')) > cheap_column = Column(Unicode(10)) > expensive_column = Column(LargeBinary) > > I'd like Child to get lazily joined when Parent is loaded, but only with > Child's "cheap_column" and not it's "expensive_column". > > Thanks, > Seth > > > -- > 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+unsubscr...@googlegroups.com. > To post to this group, send email to sqlalchemy@googlegroups.com. > Visit this group at http://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. -- 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+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.