Hi again,
I implemented a relationship using back_populates using the example
http://docs.sqlalchemy.org/en/latest/orm/inheritance.html#relationships-with-concrete-inheritance
But I stumbled in a problem: My super class A does not have a table, it is
based in a polymorphic union (thanks Michael
I think i didn't explain the error enough; just calling del user.name in the
example below causes an exception (except when i already accessed (say print
user.name) the attribute, which seemed odd to me). This is independent of
whether the attr becomes None.
Otherwise it isn't a real problem
Awesome Michael it has given a speedup actually outside of caching even,
which is great.
How do I do the equivelant of this though?
compiled = stmt.compile()
params = compiled.params
# here we return the key as a long string. our key mangler
# set up with the region will boil
It seems that I have found a solution. After digging in sqlalchemy code, it
seems that the _configure_property mapper function would do the trick.
so ...
newprop = RelationshipProperty(newtargetmodel, **rel_kwargs)
newparentmodel.__mapper__._configure_property(oldprop.key, newprop)
so what I
On Jul 13, 2013, at 1:48 AM, Ahmed ahmedba...@gmail.com wrote:
Hello all,
I have the following scenario:
I have 5 or 6 related sqlalchemy declarative models sitting in a pyramid app.
This occurs in the context of extending a pyramid application, where I
import/config.scan() these
On Jul 13, 2013, at 9:13 AM, Alexandre Torres alexandre.tor...@gmail.com
wrote:
Hi again,
I implemented a relationship using back_populates using the example
http://docs.sqlalchemy.org/en/latest/orm/inheritance.html#relationships-with-concrete-inheritance
But I stumbled in a problem: My
On Jul 13, 2013, at 10:24 AM, Lars van Gemerden l...@rational-it.com wrote:
I think i didn't explain the error enough; just calling del user.name in the
example below causes an exception (except when i already accessed (say print
user.name) the attribute, which seemed odd to me). This is
On Jul 13, 2013, at 11:27 AM, Amir Elaguizy aelag...@gmail.com wrote:
Awesome Michael it has given a speedup actually outside of caching even,
which is great.
How do I do the equivelant of this though?
compiled = stmt.compile()
params = compiled.params
# here we return
SQLAlchemy already understands that class A is abstract, and if it doesn't
have the relationship that is also fine, but then there's nothing to point
a back populates towards. If you want a back populates then you have
to make the action relationship on your base class.This is
actually it is not a list, because it is the one side, I just need to
return None. alright?
I just need to lure the orm for the abstract class A returning an empty
list.
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Oh, it was so easy!
XMapper = mapper(X, C_table, properties={
'resources': relationship(A,collection_class=set,*back_populates='action'*
)})
AMapper = mapper(A,pjoin,with_polymorphic=('*',
pjoin),polymorphic_on=pjoin.c.type,properties={
'action' : relationship(X) # no back_populates, it will
Thank you again Michael!
It is really awesome, I can just add to the resources collection and it
will know what is the correct reverse action.
Em sábado, 13 de julho de 2013 16h06min55s UTC-3, Alexandre Torres escreveu:
Oh, it was so easy!
XMapper = mapper(X, C_table, properties={
Just trying to help; i am not sure, but what you might also consider is to
initialise attributes (or on first access) with a default if a default value as
Column argument is given (i am already doing this in my own code) and also
reset to this default in case of del, but maybe there are
anyway, with some profiling of loading 1000 rows with six deferred cols, the
function count with the defer was over 50K and without the defer around 37K;
the patch is now committed and with the defer it's at 32K, so a bit less than
that of loading the data, as it should be (more would be better
On Jul 13, 2013, at 3:21 PM, Lars van Gemerden l...@rational-it.com wrote:
Just trying to help; i am not sure, but what you might also consider is to
initialise attributes (or on first access) with a default if a default value
as Column argument is given (i am already doing this in my own
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