使用plone.indexer在一个索引下分类多种类型

Question

In configure.zcml I have:

<adapter name="getCountry" factory=".extender.country_indexer" />

In extender.py I have:

@indexer(IATFile)
@indexer(IATImage)
@indexer(IProject)
@indexer(IATDocument)
def country_indexer(context):
    return _country_indexer(context)

But this does not catalog all those types under the getCountry index.

If I comment out all but one decorator, it works for that type.

How do I manage to catalog all of them?

Some more info. Only one of the registrations is called with the proper callable. The others are called with DelegatingIndexerFactory:

indexer.__init__ <plone.indexer.decorator.indexer instance at 0xafa6998> (<InterfaceClass Products.ATContentTypes.interfaces.file.IATFile>,)
indexer.__init__ <plone.indexer.decorator.indexer instance at 0xafa6f80> (<InterfaceClass Products.ATContentTypes.interfaces.image.IATImage>,)
indexer.__init__ <plone.indexer.decorator.indexer instance at 0xafa8050> (<InterfaceClass project.interfaces.project.IProject>,)
indexer.__init__ <plone.indexer.decorator.indexer instance at 0xafa8128> (<InterfaceClass Products.ATContentTypes.interfaces.document.IATDocument>,)
indexer.__call__ <plone.indexer.decorator.indexer instance at 0xafa8128> <function country_indexer at 0xafa76e0>
indexer.__call__ <plone.indexer.decorator.indexer instance at 0xafa8050> <plone.indexer.delegate.DelegatingIndexerFactory object at 0xafa5910>
indexer.__call__ <plone.indexer.decorator.indexer instance at 0xafa6f80> <plone.indexer.delegate.DelegatingIndexerFactory object at 0xafa5b90>
indexer.__call__ <plone.indexer.decorator.indexer instance at 0xafa6998> <plone.indexer.delegate.DelegatingIndexerFactory object at 0xafa5910>

Answer 1

I'm afraid the @indexer decorator does not support chaining.

There are several possible solutions:

1. Marker interface (My Favorite)

Mark the content, which support _country_indexer with a separate marker interface. For example ICountry ?

This can be done with ZCML:

<class class="dotted.name.to.my.class">
      <implements interface="dotted.name.to.ICountry" />
</class>

Then use this interface for the indexer

@indexer(ICountry)
def country_indexer(context):
    return _country_indexer(context)

2. Register on Interface and implement the logic directly into the method:

@indexer(Interface)
def country_indexer(context):
    SUPPORTED = [IATFile, IATImage, IProject, IATDocument]
    ...

3. Duplicate your code several times

@indexer(IATDocument)
def country_indexer_at_doc(context):
    return _country_indexer(context)

@indexer(IATFile)
def country_indexer_at_file(context):
    return _country_indexer(context)

@indexer(IATImage)
def country_indexer_at_img(context):
    return _country_indexer(context)

...

And the zcml part:

<adapter name="getCountry" factory=".extender.country_indexer_at_doc" />
<adapter name="getCountry" factory=".extender.country_indexer_at_file" />
<adapter name="getCountry" factory=".extender.country_indexer_at_img" />
...