Re: possible to filter ManyToMany results?
Luke Plant wrote:
> As I understand it, Django should be able to do this query no problem.
> I think there may be a mistake in what you posted though - IIRC, I
> would have expected the method name to be 'get_articles_list' not
> 'get_article_list', since you defined it as 'articles =
> meta.ManyToManyField(Article)'. If you post the entire code for your
> models we may be able to find the problem. Magic-removal branch
> doesn't really change what is possible here, it just changes the
> syntax.
>
hi Luke, Ivan!
I've migrated my new app to the m-r branch, it's AWESOME!
it's really simple to get things done:
[code]
gamesku = GameSku.objects.get(pk=gamesku_id)
article_list =
gamesku.articles.filter(article_type__name__exact=article_type).order_by('-submit_date')
[/code]
that's what I want :D
and, here is my **old** models definition, I don't know if it's
possible to do so with django trunk:
class ArticleType(meta.Model):
name = meta.CharField(maxlength=128)
display_name = meta.CharField(maxlength=128)
display_order = meta.IntegerField(blank=False)
description = meta.CharField(maxlength=2048)
class Article(meta.Model):
user = meta.ForeignKey(auth.User)
article_type = meta.ForeignKey(ArticleType)
title = meta.CharField(_('title'), maxlength=255, blank=False)
description = meta.TextField(_('description'), maxlength=500)
content = meta.TextField(_('content'), maxlength=3000)
submit_date = meta.DateTimeField(_('date/time submitted'),
auto_now_add=True)
class GameSku(meta.Model):
game = meta.ForeignKey(Game)
platform = meta.ForeignKey(GamingPlatform)
developer = meta.ForeignKey(Company, verbose_name='Developer')
publisher = meta.ForeignKey(Company, verbose_name='Publiser')
name = meta.CharField(maxlength=128)
articles = meta.ManyToManyField(Article)
the sql I wrote to get what I want is:
sql = "select distinct articles.id as id from articles, article_type,
game_sku_articles, game_sku where article_type.name =
'%(article_type)s' and articles.article_type_id = article_type.id and
game_sku.id = '%(gamesku_id)d' and game_sku_articles.gamesku_id =
game_sku.id and game_sku_articles.article_id = articles.id" % locals()
I was wondering how to "get a spefic type of articles of a gamesku
while gamesku & articles' relationship is many-to-many" in django
trunk..
BiG thanks to all you guys!
I used to be someone who didn't like django's ORM stuff, however, in
the new m-r branch, with brand-new ORM support and transaction support,
I'm LOVING it!
Django rocks! :)
- nkeric
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Re: possible to filter ManyToMany results?
Luke Plant wrote: >As I understand it, Django should be able to do this query no problem. > > I also thought so :-). I created a test project with this model and tried to get this query to work. "get_article_list" is indeed there but it doesn't like 'article_type__id__exact' as an argument. I think this is a limitation of current trunk (may be a bug) that you can't have additional joins in selects from M-M relations. But still, may be I just didn't search good enough... --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users -~--~~~~--~~--~--~---
Re: possible to filter ManyToMany results?
nkeric wrote:
>Really? That's cool!
>
>
Yes. One of the great new features of m-r branch is that relation
queries work similary for M-M and 1-M relations and in both directions:
game.articles.filter(article_type__pk=1) # all articles for one game
of one type
article.game_set.all() # all games from one article
and even
article.game_set.filter(article__article_type__pk=1)
... which gives all games mentioned in the article that was mentioned in
other articles of certain type (though it's not very practicle :-) )
>Our site (http://www.ifaxian.com - a Chinese Digg-like site) built upon
>the svn trunk version, we're planning to migrate to the m-r branch
>soon, I guess it's time for me to take a deeper look into the m-r
>branch :)
>
>
My advice is to making it sooner than later. I just killed the whole day
yesterday refactoring my project (medium sized mp3 exchange service with
wishlists, catalog, search and a blog) to magic removal. The most time I
spent converting old SQL queries to new ORM calls. So the more old stuff
you have the more you will have to convert.
If you fancy an example... To track downloads I have a DownloadLog table
that basically just references Users and Albums with foreign keys. There
was one query that selects "albums downloaded by users that have
downloaded this album". In trunk version there was an SQL of two nested
selects that looked pretty scary. Now it's just one line:
Album.objects.filter(downloadlog__user__downloadlog__album__pk=self.id).exclude(pk=self.id).distinct()
... which almost can be read in English ("albums in logs with users in
logs with this album").
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Re: possible to filter ManyToMany results?
On Wednesday 12 April 2006 07:03, nkeric wrote: > hi all, > > I've done some search, however, I guess I should ask for your helps > here: > > I have the following models: (pseudo code) > > class ArticleType: > name = ... > > class Article: > title = ... > article_type = meta.ForeignKey(ArticleType) > > class Game: > name = ... > articles = meta.ManyToManyField(Article) > > how can I retrive the articles of a certain article type of a given > game? > > >>> g = games.get_object(pk=1) > >>> g.get_article_list(article_type_id__exact=1) > > doesn't work, though I knew how to do this in raw sql... As I understand it, Django should be able to do this query no problem. I think there may be a mistake in what you posted though - IIRC, I would have expected the method name to be 'get_articles_list' not 'get_article_list', since you defined it as 'articles = meta.ManyToManyField(Article)'. If you post the entire code for your models we may be able to find the problem. Magic-removal branch doesn't really change what is possible here, it just changes the syntax. Luke -- "Humiliation: The harder you try, the dumber you look." (despair.com) Luke Plant || L.Plant.98 (at) cantab.net || http://lukeplant.me.uk/ --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users -~--~~~~--~~--~--~---
Re: possible to filter ManyToMany results?
nkeric wrote: >Ivan, thanks a lot for your reply :) >well, I guess I have to take the "dirty" sql approach :p > > You might want to look into magic-removal branch where things like this are made possible with ORM. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users -~--~~~~--~~--~--~---
Re: possible to filter ManyToMany results?
Ivan Sagalaev wrote: > nkeric wrote: > > >hello, could anybody pls help? I don't want to write dirty sql if I > >could do it via django ORM... > > > > > Well... The only thing I could work out is this: > > articles = [a for a in g.get_article_list() if a.article_type_id == 1] Ivan, thanks a lot for your reply :) well, I guess I have to take the "dirty" sql approach :p Regards, - Eric --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users -~--~~~~--~~--~--~---
Re: possible to filter ManyToMany results?
nkeric wrote: >hello, could anybody pls help? I don't want to write dirty sql if I >could do it via django ORM... > > Well... The only thing I could work out is this: articles = [a for a in g.get_article_list() if a.article_type_id == 1] Drawbacks are obvious: it's always selects all articles for a game (which may be slow) and it can filter type only be id. But it can be a viable solution. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users -~--~~~~--~~--~--~---
Re: possible to filter ManyToMany results?
hello, could anybody pls help? I don't want to write dirty sql if I could do it via django ORM... BiG thanks! :) --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users -~--~~~~--~~--~--~---
Re: possible to filter ManyToMany results?
Ivan Sagalaev wrote: > g.get_article_list(article_type_id__exact=1) > It's g.get_article_list(article_type__id__exact=1). Note 2 underscores > before "id" which means field "id" of a parent table. sorry for mistyped that, I tried this: >>> g.get_article_list(article_type__id__exact=1) Traceback (most recent call last): File "", line 1, in ? File "/usr/lib/python2.4/site-packages/django/utils/functional.py", line 3, in _curried TypeError: method_get_many_to_many() got an unexpected keyword argument 'article_type__id__exact' doesn't work either... :( --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users -~--~~~~--~~--~--~---
Re: possible to filter ManyToMany results?
nkeric wrote: >class ArticleType: >name = ... > >class Article: >title = ... >article_type = meta.ForeignKey(ArticleType) > >class Game: >name = ... >articles = meta.ManyToManyField(Article) > >how can I retrive the articles of a certain article type of a given >game? > > > g = games.get_object(pk=1) g.get_article_list(article_type_id__exact=1) It's g.get_article_list(article_type__id__exact=1). Note 2 underscores before "id" which means field "id" of a parent table. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users -~--~~~~--~~--~--~---
