doc/book/en/A02b-components.en.txt
author Sandrine Ribeau <sandrine.ribeau@logilab.fr>
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[doc] Fix bad reference.
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.. -*- coding: utf-8 -*-
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.. _cubes:
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Cubes
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-----
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Standard library
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~~~~~~~~~~~~~~~~
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A library of standard cubes are available from `CubicWeb Forge`_
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Cubes provide entities and views.
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The available application entities are:
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* addressbook: PhoneNumber and PostalAddress
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* basket: Basket (like a shopping cart)
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* blog: Blog (a *very* basic blog)
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* classfolder: Folder (to organize things but grouping them in folders)
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* classtags: Tag (to tag anything)
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* file: File (to allow users to upload and store binary or text files)
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* link: Link (to collect links to web resources)
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* mailinglist: MailingList (to reference a mailing-list and the URLs
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  for its archives and its admin interface)
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* person: Person (easily mixed with addressbook)
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* task: Task (something to be done between start and stop date)
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* zone: Zone (to define places within larger places, for example a
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  city in a state in a country)
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The available system entities are:
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* comment: Comment (to attach comment threads to entities)
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Adding comments to BlogDemo
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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To import a cube in your application just change the line in the
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``__pkginfo__.py`` file and verify that the cube you are planning
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to use is listed by the command ``cubicweb-ctl list``.
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For example::
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    __use__ = ('comment',)
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will make the ``Comment`` entity available in your ``BlogDemo``
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application.
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Change the schema to add a relationship between ``BlogEntry`` and
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``Comment`` and you are done. Since the comment cube defines the
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``comments`` relationship, adding the line::
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    comments = ObjectRelation('Comment', cardinality='1*', composite='object')
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to the definition of a ``BlogEntry`` will be enough.
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Synchronize the data model
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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Once you modified your data model, you need to synchronize the
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database with your model. For this purpose, `CubicWeb` provides
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a very useful command ``cubicweb-ctl shell blogdemo`` which
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launches an interactive migration Python shell. (see 
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:ref:`cubicweb-ctl` for more details))
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As you modified a relation from the `BlogEntry` schema,
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run the following command:
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::
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  synchronize_rschema('BlogEntry')
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You can now start your application and add comments to each 
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`BlogEntry`.