Plone 4相关项目返回参考问题

时间:2011-05-13 16:34:48

标签: plone plone-4.x

我找不到相关项目的参考对象。

我的代码:

back_rels = list(catalog.findRelations({'to_id': intids.getId(aq_base(self.context))}))

for rel in back_rels:
    ob = portal.unrestrictedTraverse(rel.from_path)

在ob = portal.unrestrictedTraverse(rel.from_path)运行时抛出异常。

调试结果:

> len(back_rels)
> 1 
> rel
> <z3c.relationfield.relation.RelationValue object at oxoA86f8f0>
> rel.from_path 
> 'new-grants-target-bioterrorism'
> rel.to_path
> '/portal/urnews/ur-gets-20-million-for-biodefense-studies'

我猜问题是rel.from_path没有像rel.to_path那样返回完整路径。

我的问题是rel.from_path如何以完整路径返回并在

处获得正确的对象
portal.unrestrictedTraverse(rel.from_path)?

我正在运行Plone 4并使用dexterity内容类型。

1 个答案:

答案 0 :(得分:0)

很遗憾,您无法访问from_object directy。本期http://code.google.com/p/dexterity/issues/detail?id=95

对此进行了解释

使用from_id,它存储IntId并使用IntIds实用程序来检索特定对象:

from Acquisition import aq_inner
from zope.component import getUtility
from zope.intid.interfaces import IIntIds
from zope.security import checkPermission
from zc.relation.interfaces import ICatalog


def back_references(source_object, attribute_name):
    """ Return back references from source object on specified attribute_name """
    catalog = getUtility(ICatalog)
    intids = getUtility(IIntIds)
    result = []
    for rel in catalog.findRelations(
                            dict(to_id=intids.getId(aq_inner(source_object)),
                                 from_attribute=attribute_name)
                            ):
        obj = intids.queryObject(rel.from_id)
        if obj is not None and checkPermission('zope2.View', obj):
            result.append(obj)
    return result