Title-to-Id Behavior

title-to-id 是 Plone 的行為特色，在建立文件的過程，會把 title 欄位的值，轉換成 URL 的值。事實上，也可以事後轉換，例如寫成 External Method 來批次執行。

Archetypes 預設就使用 title-to-id 機制，相關的程式碼片段整理如下：

Products/Archetypes/BaseObject.py

# Import conditionally, so we don't introduce a hard dependency
try:
    from plone.i18n.normalizer.interfaces import IUserPreferredURLNormalizer
    from plone.i18n.normalizer.interfaces import IURLNormalizer
    URL_NORMALIZER = True
except ImportError:
    URL_NORMALIZER = False

class BaseObject(Referenceable):
    ...
    def generateNewId(self):
        """Suggest an id for this object.
        This id is used when automatically renaming an object after creation.
        """
        title = self.Title()
        # Can't work w/o a title
        if not title:
            return None

        # Don't do anything without the plone.i18n package
        if not URL_NORMALIZER:
            return None

        if not isinstance(title, unicode):
            charset = self.getCharset()
            title = unicode(title, charset)

        request = getattr(self, 'REQUEST', None)
        if request is not None:
            return IUserPreferredURLNormalizer(request).normalize(title)

        return queryUtility(IURLNormalizer).normalize(title)

    def _renameAfterCreation(self, check_auto_id=False):
        """Renames an object like its normalized title.
        """
        old_id = self.getId()
        if check_auto_id and not self._isIDAutoGenerated(old_id):
            # No auto generated id
            return False

        new_id = self.generateNewId()

plone/i18n/normalizer/__init__.py

class URLNormalizer(object):
    ...
    def normalize(self, text, locale=None, max_length=MAX_URL_LENGTH):
        ...
        text = baseNormalize(text)
        base = text # use text.lower() to make it lower-case

把原本 base = text.lower() 改成 base = text。

另外，Dexterity 則利用 Name From Title 的行為設定來啟用，參考 plone.app.content 裡 interfaces.py 的 INameFromTitle。