Èç:[0,1,2,...]
·ÇÒªÓÃÑ­»·Âð£¿
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你要的是range(n) 么？

在 07-4-25，Frog<isfrog在gmail.com> 写道：
> 如:[0,1,2,...]
> 非要用循环吗？
> _______________________________________________
> python-chinese
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Ô­À´Èç´Ë£¬¸Ðл£¬ÎÒ»ù±¾¹¦Õâô²îÏëÂò±¾Êé¿´£¬ÄÜÍƼöÒ»ÏÂÂð?

2007/4/25, Rodin <schludern在gmail.com>:
>
> ÄãÒªµÄÊÇrange(n) ô£¿
>
> ÔÚ 07-4-25£¬Frog<isfrog在gmail.com> дµÀ£º
> > Èç:[0,1,2,...]
> > ·ÇÒªÓÃÑ­»·Âð£¿
> > _______________________________________________
> > python-chinese
> > Post: send python-chinese在lists.python.cn
> > Subscribe: send subscribe to
> > python-chinese-request在lists.python.cn
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> >
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ÔÚdjango 0.96 ÖÐ

ÔÚmodelsÖÐÓжÔÏóProduct¼° ProductImages
class Product(models.Model):
 name = models.CharField(maxlength=64);
 @property
    def frist_thumbnail(self):
 return self.productimages_set.latest('id');

class ProductImages(models.Model):
    product = models.ForeignKey(Product);
    name = models.CharField(maxlength =32);
    thumb = models.ImageField(upload_to = 'product');

Èç¹ûÔÚviewsÖÐÓиöÈçÏ·½·¨
def hot_product(self):
    return Product.objects.values('id','name')[0:10];


È»ºóÔÚÄ£°åÖÐ,ͨ¹ýÈçÏ´úÂë·ÃÎʲúÆ·¼°Í¼Æ¬ÐÅÏ¢    
{% for p in hot %}
    {{p.frist_thumbnail}}
{% endfor %}

ʱ,ÓиöÎÊÌâ,Èç¹ûʹÓà objects.values(fields) ·µ»ØµÄ¶ÔÏó,ÔÚµ÷ÓùØÁª(foreignkey)¶ÔÏóʱ
ʵÏÖpÎÞ·¨»ñµÃfrist_thumbnailµÄʵÀý¹ØÁªÐÅÏ¢.(¼´ProductµÄʵÁÐÈç¹ûÊÇͨ¹ývaluesɸѡ³öÀ´µÄ,
ÔÚÄ£°åµ÷ÓÃÖÐ,ÎÞ·¨ÕýÈ·µÄ»ñµÃp¶ÔÏóµÄ¹ØÁªproductiamgesÐÅÏ¢).

µ«Èç¹ûÖ±½Ó°Ñ objects.values('id','name')¸Ä³É product.objects.all()[0:10],²»¸Ä¶¯ÈκδúÂë(templatesÖеÄ)
¶¼¿ÉÒÔÉúЧ.

²»ÖªµÀÎÒÄÄÀïд´íÁË?
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On 4/25/07, bbenyu <bbenyu在gmail.com> wrote:
>
>
> 在django 0.96 中
>
> 在models中有对象Product及 ProductImages
> class Product(models.Model):
>  name = models.CharField(maxlength=64);
>  @property
>     def frist_thumbnail(self):
>  return self.productimages_set.latest('id');
>
> class ProductImages(models.Model):
>     product = models.ForeignKey(Product);
>     name = models.CharField(maxlength =32);
>     thumb = models.ImageField(upload_to = 'product');
>
> 如果在views中有个如下方法
> def hot_product(self):
>     return Product.objects.values('id','name')[0:10];
>
>
> 然后在模板中,通过如下代码访问产品及图片信息
> {% for p in hot %}
>     {{p.frist_thumbnail}}
> {% endfor %}
>
> 时,有个问题,如果使用 objects.values(fields) 返回的对象,在调用关联(foreignkey)对象时
> 实现p无法获得frist_thumbnail的实例关联信息.(即Product的实列如果是通过values筛选出来的,
> 在模板调用中,无法正确的获得p对象的关联productiamges信息).
>
> 但如果直接把 objects.values('id','name')改成
> product.objects.all()[0:10],不改动任何代码(templates中的)
> 都可以生效.
>
> 不知道我哪里写错了?

values返回的不是记录对象，而是一个字典，自然没有Model中的方法了。所以还是要使用all()才可以。


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Dive into Python不错
tut也可以看看
然后应该可以直接看手册了

在07-4-25，Frog <isfrog at gmail.com> 写道：
>
> 原来如此，感谢，我基本功这么差想买本书看，能推荐一下吗?
>
> 2007/4/25, Rodin <schludern at gmail.com>:
> >
> > 你要的是range(n) 么？
> >
> > 在 07-4-25，Frog<isfrog at gmail.com> 写道：
> > > 如:[0,1,2,...]
> > > 非要用循环吗？
> > > _______________________________________________
> > > python-chinese
> > > Post: send python-chinese at lists.python.cn
> > > Subscribe: send subscribe to
> > > python-chinese-request at lists.python.cn
> > > Unsubscribe: send unsubscribe to
> > > python-chinese-request at lists.python.cn
> > > Detail Info:
> > > http://python.cn/mailman/listinfo/python-chinese
> > >
> > _______________________________________________
> > python-chinese
> > Post: send python-chinese at lists.python.cn
> > Subscribe: send subscribe to python-chinese-request at lists.python.cn
> > Unsubscribe: send unsubscribe to  python-chinese-request at lists.python.cn
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>
>
> _______________________________________________
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