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Dynamic SearchableText index for dexterity content types

Project description

Introduction

collective.dexteritytextindexer provides a dynamic SearchableText indexer for dexterity content types. It makes it possible to index fields of multiple behaviors as SearchableText.

Usage

For enabling the indexer just add the behavior to the list of behaviors of your content types.

In your profiles/default/types/YOURTYPE.xml add the behavior:

<?xml version="1.0"?>
<object name="example.conference.presenter" meta_type="Dexterity FTI"
   xmlns:i18n="http://xml.zope.org/namespaces/i18n"
   i18n:domain="example.conference">

 <!-- enabled behaviors -->
 <property name="behaviors">
     <element value="collective.dexteritytextindexer.behavior.IDexterityTextIndexer" />
 </property>

</object>

Now you need to mark the fields you wan’t to have in your SearchableText. This is done with directives:

from collective import dexteritytextindexer
from plone.autoform.interfaces import IFormFieldProvider
from plone.directives import form
from zope import schema
from zope.interface import alsoProvides

class IMyBehavior(form.Schema):

    dexteritytextindexer.searchable('specialfield')
    specialfield = schema.TextField(title=u'Special field')

alsoProvides(IMyBehavior, IFormFieldProvider)

Don’t forget to grok your package in your configure.zcml:

<configure xmlns="http://namespaces.zope.org/zope"
           xmlns:grok="http://namespaces.zope.org/grok">

    <include package="five.grok" />
    <grok:grok package="." />

</configure>

Your SearchableText indexer includes now your custom field on your behavior, as soon you enable it in your content type, where IDexterityTextIndexer behavior is enabled too.

Registering a custom field converter

By default, a field is converted to a searchable text by rendering the widget in display mode and transforming the result to text/plain. However, if you need to convert your custom field in a different way, you only have to provide a more specific converter multi-adapter.

Convert multi-adapter specification:

Interface:collective.dexteritytextindexer.IDexterityTextIndexFieldConverter
Discriminators:context, field, widget

Example:

from collective.dexteritytextindexer.converters import DefaultDexterityTextIndexFieldConverter
from five import grok
from my.package.interfaces import IMyFancyField
from plone.dexterity.interfaces import IDexterityContent
from z3c.form.interfaces import IWidget

class CustomFieldConverter(DefaultDexterityTextIndexFieldConverter):
    grok.adapts(IDexterityContent, IMyFancyField, IWidget)

    def convert(self):
         # implement your custom converter
         # which returns a string at the end
         return ''

There is already an adapter for converting NamedFiles properly. It’s registered only if plone.namedfile is installed.

Extending indexed data

Sometimes you need to extend the SearchableText with additional data which is not stored in a field. It’s possible to register a named adapter which provides additional data:

from five import grok
from collective import dexteritytextindexer

class MySearchableTextExtender(grok.Adapter):
    grok.context(IMyBehavior)
    grok.name('IMyBehavior')
    grok.implements(dexteritytextindexer.IDynamicTextIndexExtender)

    def __init__(self, context):
        self.context = context

    def __call__(self):
        """Extend the searchable text with a custom string"""
        return 'some more searchable words'

This is a named adapter! This makes it possible to register multiple extenders for the same object on different behavior interfaces. The name of the adapter does not matter, but it’s recommended to use the name of the behavior (this may reduce conflicts).

If your behavior has a defined factory (which is not attribute storage), then you need to define a marker interface and register the adapter on this marker interface (dexterity objects do not provide behavior interfaces of behaviors, which are not using attribute storage).

Credits

Sponsered by 4teamwork.

Changelog

1.0b3

  • Moved IDynamicTextIndexExtender to interfaces module. [jbaumann]
  • The plone.namedfile is now optional. The new namedfile converting adapter is only registered if its present [jbaumann]
  • Re-implemented converting of field data with an newly introduced adapter. The default converter just converts the widget in display mode and transforms it to text/plain. [jbaumann]
  • Fixed tests for compaitbility with plone.app.testing 4.0a3: Use TEST_USER_ID instead of TEST_USER_NAME [jbaumann]
  • fixed Bug UnicodeError: while indexing lists or dicts with special chars (Non-Ascii characters) [phgross]

1.0b2

  • Fixed MANIFEST.in [jbaumann]

1.0b1

  • Initial release

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