[sqlalchemy] Re: Updating existing objects
On Dec 27, 2008, at 1:39 PM, Andreas Jung wrote: On 27.12.2008 3:06 Uhr, Eric Abrahamsen wrote: Sorry for the very beginner question, but I haven't been able to find a good discussion of this issue online (possibly because it's too basic). I'm using sqlalchemy as part of a basic web-based CRUD-style CMS. I've got the Create, Read and Delete parts down, but I'm not sure how best to handle the Update part. Because the update page handler functions are generic and reused for many different models, all I can be sure of is having a single object instance, and a dictionary of new values with which to update the instances attributes. All I can think of doing is instance.__dict__.update(value_dict) for k,v in value_dict.items(). setattr(instance, k, v) Of course! Thanks a lot for your help. Eric -aj begin:vcard fn:Andreas Jung n:Jung;Andreas org:ZOPYX Ltd. Co. KG adr;quoted-printable:;;Charlottenstr. 37/1;T=C3=BCbingen;; 72070;Germany email;internet:i...@zopyx.com title:CEO tel;work:+49-7071-793376 tel;fax:+49-7071-7936840 tel;home:+49-7071-793257 x-mozilla-html:FALSE url:www.zopyx.com version:2.1 end:vcard --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Updating existing objects
Sorry for the very beginner question, but I haven't been able to find a good discussion of this issue online (possibly because it's too basic). I'm using sqlalchemy as part of a basic web-based CRUD-style CMS. I've got the Create, Read and Delete parts down, but I'm not sure how best to handle the Update part. Because the update page handler functions are generic and reused for many different models, all I can be sure of is having a single object instance, and a dictionary of new values with which to update the instances attributes. All I can think of doing is instance.__dict__.update(value_dict) Which I've heard is not the way to do it, and also seems to be leaving out certain dictionary values in some cases. Is there an accepted way to handle these kinds of operations? Thanks, Eric --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] filtering by datetime elements
Hi there,
I'm new to this, so please be patient if I'm a little slow... I'm
trying to filter Article objects by a datetime field ('pubdate'), and
expected that I would be able to do something like this:
arts = sess.query(Article).filter(and_(Article.pubdate.year==year,
Article.pubdate.month==month, Article.id==id)).one()
This gives me:
AttributeError: 'InstrumentedAttribute' object has no attribute 'year'
Apparently methods on attributes are reserved for sqlalchemy
internals, and I'm not working with a straight Python object, as I'd
thought. That makes sense, but can anyone suggest a simple substitute
for what I'm trying to do here?
Thanks very much,
Eric
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[sqlalchemy] Re: filtering by datetime elements
On May 17, 2008, at 11:17 PM, [EMAIL PROTECTED] wrote: it's SQL that is not working with python objects, and the column pubdate (associated with type DateTime on python side) has no attr .year or .month. lookup the messages in the group, there were some sugestions long time ago, but AFAIremember one was something with strings, another with separate columns. Thanks svil, this is good to know. I suppose there's no reason why I can't pull a simpler query into Python and then filter it by date there. It seems like doing this in the SQL query is going to be hackish no matter what, particularly when it's so simple to do in Python... Thanks again, Eric --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups sqlalchemy group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
