Michael-
Quick question for clarity...
I have a table with a few deferred columns. If I want to eagerly load
them during a query, I should pass in the undefer option right ?
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yeah there's some bad history with the API here, in that you can't easily pass
them all at once, but right now it's q.options(undefer('*')) for everything or
q.options(undefer('x'), undefer('y'), ...). or undefer_group() if you've
applied a group to them.
On May 15, 2014, at 1:42 PM,
that's not too bad. at least for me; i only defer a few HSTORE columns.
On Thursday, May 15, 2014 2:24:51 PM UTC-4, Michael Bayer wrote:
yeah there’s some bad history with the API here, in that you can’t easily
pass them all at once, but right now it’s q.options(undefer(‘*’)) for
Thanks Mike,
But...is there no way to set this behavior directly on the
relationship()? The whole point there is to be lazy ;)
Seth
On Saturday, May 10, 2014 7:59:33 PM UTC-7, Michael Bayer wrote:
session.query(Parent).options(defaultload(“children”).load_only(“cheap_column))
or really
there are deferred() columns that you can set on a mapper but there's not a
mechanism right now to set deferred target attributes when the object is loaded
only from a specific relationship without the specific call within the query().
So unless you maybe ran those options into every Query
Ok, thanks so much for your help.
On Wednesday, May 14, 2014 2:35:27 PM UTC-7, Michael Bayer wrote:
there are deferred() columns that you can set on a mapper but there’s not
a mechanism right now to set deferred target attributes when the object is
loaded only from a specific
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):
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,
