Question

让我今天有一个基于Archtypes的对象，其中包含一个多值引用字段ReferenceField，如下所示：

schema = BaseSchema.copy() + Schema((
    ReferenceField(
        'SomeObjects',
        multiValued=1,
        allowed_types=('SomeObjects',),
        relationship = 'ThisObjectSomeObject',
    )
))

class ThisObject(BaseContent):
    schema = schema

如何使用代码添加对SomeObjects字段的引用？

Answer 1

抓取字段的值，修改它并设置字段。您可以直接添加实例，也可以使用UID字符串。

这样的事情：

val = instance.getSomeObjects()
val = val if val else []
val.append(uid)
instance.setSomeObjects(val)

Answer 2

此示例使用File内容类型和plone的relatedItems字段，向您展示ReferenceField如何工作

假设plone是你的Plone网站。

# Create two files
>>> plone.invokeFactory('File', 'file1')
file1
>>> plone.invokeFactory('File', 'file2')
file2

# Set reference from file1 to file2
# Since relatedItems is also multi valued like your field you have to pass a list of objects.
>>> plone.file1.setRelatedItems([file2])

# With the `regular` getter you got the objects
>>> plone.file1.getRelatedItems()
[<ATFile at /Plone/file2>]

# With the special raw getter you got the UID of the objects
>>> plone.file1.getRawRelatedItems()
['e1486e46376545db92f911c48dae5c69']

# You can also pass the UID of the object to the setter
plone.fil1.setRelatedItems([file2.UID()])

>>> plone.file1.getRelatedItems()
[<ATFile at /Plone/file2>]

Answer 3

我假设你在这里问你如何以编程方式从ThisObject的实例中保存对另一个对象的引用？

如果是这样，你只需要传入你想要引用的对象的UID：

object.setSomeObjects(otherObject.UID())

如何使用代码添加对多值ReferenceField的引用？

3 个答案: