dolmen.app.content 0.1

Dolmen applications content utilities

dolmen.app.content provides out-of-the-box utilities for Dolmen applications content.

Getting started

We import Grok and grok the package:

>>> import grok
>>> grok.testing.grok('dolmen.app.content')

We create a dolmen.content content:

>>> import dolmen.content
>>> class Mammoth(dolmen.content.Content):
...    grok.name('A furry thing')
>>> manfred = Mammoth()
>>> manfred.title = u'A nice mammoth'

Indexes

dolmen.app.content registers two indexes to catalog the dolmen.content.IBaseContent created inside a Dolmen application:

>>> from dolmen.app.content import indexes

Base indexes

The dolmen.app.content.indexes.BaseIndexes handles the title and the content type of an IBaseContent content:

>>> indexes.BaseIndexes.__grok_indexes__
{'content_type': <grok.index.Field object at ...>, 'title': <grok.index.Text object at ...>}

>>> indexes.BaseIndexes.__grok_indexes__['content_type']._attribute
'__content_type__'

Searchable text

dolmen.app.content provides a simple ‘ISearchableText’ implementation, allowing full text searches. It comes in two parts.

The index:

>>> indexes.SearchableIndex.__grok_indexes__
{'searchabletext': <grok.index.Text object at ...>}

The adapter:

>>> from zope.index.text.interfaces import ISearchableText
>>> adapter = ISearchableText(manfred)
>>> adapter.getSearchableText()
u'A nice mammoth'

Thumbnailing

Thanks to dolmen.thumbnailer, dolmen.app.content provides a base thumbnailing policy, using ZODB blobs as storage and introducing a new scale.

Scales

Let’s introspect our Miniaturizer component:

>>> from dolmen.app.content import thumbnails

>>> thumbnails.BlobMiniaturizer.factory
<class 'dolmen.blob.file.BlobValue'>

>>> print thumbnails.BlobMiniaturizer.scales
{'mini': (250, 250), 'square': (64, 64), 'thumb': (150, 150), 'large': (700, 700), 'small': (128, 128), 'preview': (400, 400)}

The new scale, ‘square’, scales down and crops the original image to provide a square thumbnail. This is done using a IThumbnailer adapter:

>>> from dolmen.thumbnailer import IThumbnailer
>>> thumbnails.SquareThumbnailer
<class 'dolmen.app.content.thumbnails.SquareThumbnailer'>
>>> IThumbnailer.implementedBy(thumbnails.SquareThumbnailer)
True

Credits

All Dolmen packages are sponsorised by NPAI (http://www.npai.fr)

Changelog

0.1 (2009-11-02)

• Initial release