Thanks Michael, that did the trick.
Using the mutable thing is only a small comfort in my case compared to the
extra design it takes.
for the sake of completeness here is what works:
newuser = User(email,name,password)
newuser.notebooks.append(Notebook("My Notes"))
newuser.views = {}
session.add(newuser)
session.commit()
user = session.query(User).filter_by(email=email).one()
views = {}
views['lastview'] = user.notebooks[0].id
user.views = views
session.commit()
session.close()
Zoltan.
On Tuesday, March 12, 2013 4:33:32 PM UTC+1, Michael Bayer wrote:
>
> if you want to do this "manually", just reassign to the attribute which
> will trigger it:
>
> myobject.mypickle = {<dictionary>}
>
>
> the "mutation" thing is only if you want in-place tracking, that is:
>
> myobject.mypickle['newvalue'] = 'something'
>
>
>
> On Mar 12, 2013, at 11:15 AM, Zoltan Giber <zgi...@gmail.com <javascript:>>
> wrote:
>
> Thanks Matthew,
>
> I see that this would be a way, but I'm not very experienced, and
> introducing a new custom type feels like an overkill. I only have three
> pickletype in my whole app, and i don't mind to set "dirty" manually when I
> update them. I don't want to query against their values either.
>
> I was hoping that the mutable=True flag which is True by default according
> the documentation is exactly what i need, but no luck so far..
>
> On Tuesday, March 12, 2013 3:39:10 PM UTC+1, Matthew Desmarais wrote:
>>
>> Hi Zoltan,
>>
>> On Tue, Mar 12, 2013 at 9:56 AM, Zoltan Giber <zgi...@gmail.com> wrote:
>> > I'm new to sqlalchemy, writing my first app using it. I stumbled upon a
>> weird thing; my user object has a pyckletype
>> > representing a python dict, which i can't find a way to update. I
>> assumed, that a change in the pickled object will
>> > somehow trigger "dirty" and my new data should be there, but it is not.
>> My goal would be to create an user, and a
>> > notebook for the user, then add the notebook's ID to the
>> user.views['lastopened']
>> >
>> > Looking at the code it will be clear i hope (i'm adding some comments
>> here):
>> >
>> > newuser = User(email,name,password)
>> # creating the new user
>> > newuser.notebooks.append(Notebook("My Notes"))
>> # the child notebook
>> > newuser.views = {}
>> > session.add(newuser)
>> > session.commit() # couldn't find other way to get the
>> notebook id, but to make a commit. is there a
>> > better way?
>> >
>> > user = session.query(User).filter_by(email=email).one()
>> # I'm not sure if a new query is needed here,
>> > this is eliminating uncertainty
>> > defaultnb = user.notebooks[0]
>> > user.views['lastview'] = defaultnb.id
>> > session.commit()
>> > session.close()
>> >
>> > the problem is, that the user.view['lastview'] stays an empty {} ... if
>> i update it upon creation, it works, but then the
>> > notebook.id is not known to me.
>>
>> I've not done this myself, but I was curious so I looked in the
>> sqlalchemy docs for PickleType [0]. I found a note that sounds
>> applicable: "To allow ORM change events to propagate for elements
>> associated with PickleType, see Mutation Tracking [1]". I hope this is
>> helpful.
>>
>> Thanks,
>> Matthew
>>
>> [0]
>> http://docs.sqlalchemy.org/en/rel_0_8/core/types.html#sqlalchemy.types.PickleType
>>
>> [1] http://docs.sqlalchemy.org/en/rel_0_8/orm/extensions/mutable.html
>>
>
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