doc/book/en/devrepo/vreg.rst
author Aurelien Campeas <aurelien.campeas@logilab.fr>
Fri, 23 Apr 2010 17:31:46 +0200
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[doc/book] move devweb up from development, turn development into devrepo (much better structure)
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The VRegistry, selectors and application objects
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================================================
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This chapter talks about core concepts of the |cubicweb| framework,
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that make it different from other frameworks (and maybe not easy to
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grasp at a first glance). To be able to do advanced development with
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|cubicweb| you need a good understanding of what is explained below.
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This chapter goes deep into details. You don't have to remember them
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all but keep it in mind so you can go back there later.
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An overview of AppObjects, the VRegistry and Selectors is given in the
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:ref:`VRegistryIntro` chapter.
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.. autodocstring:: cubicweb.cwvreg
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.. autodocstring:: cubicweb.selectors
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.. automodule:: cubicweb.appobject
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Base selectors
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--------------
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Selectors are scoring functions that are called by the registry to tell whenever
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an appobject can be selected in a given context. Selector sets are for instance
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the glue that tie views to the data model. Using them appropriately is an
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essential part of the construction of well behaved cubes.
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Of course you may have to write your own set of selectors as your needs grows and
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you get familiar with the framework (see :ref:`CustomSelectors`).
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Here is a description of generic selectors provided by CubicWeb that should suit
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most of your needs.
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Bare selectors
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~~~~~~~~~~~~~~
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Those selectors are somewhat dumb, which doesn't mean they're not (very) useful.
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.. autoclass:: cubicweb.appobject.yes
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.. autoclass:: cubicweb.selectors.match_kwargs
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.. autoclass:: cubicweb.selectors.appobject_selectable
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Result set selectors
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~~~~~~~~~~~~~~~~~~~~~
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Those selectors are looking for a result set in the context ('rset' argument or
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the input context) and match or not according to its shape. Some of these
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selectors have different behaviour if a particular cell of the result set is
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specified using 'row' and 'col' arguments of the input context or not.
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.. autoclass:: cubicweb.selectors.none_rset
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.. autoclass:: cubicweb.selectors.any_rset
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.. autoclass:: cubicweb.selectors.nonempty_rset
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.. autoclass:: cubicweb.selectors.empty_rset
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.. autoclass:: cubicweb.selectors.one_line_rset
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.. autoclass:: cubicweb.selectors.multi_lines_rset
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.. autoclass:: cubicweb.selectors.multi_columns_rset
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.. autoclass:: cubicweb.selectors.paginated_rset
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.. autoclass:: cubicweb.selectors.sorted_rset
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.. autoclass:: cubicweb.selectors.one_etype_rset
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.. autoclass:: cubicweb.selectors.multi_etypes_rset
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Entity selectors
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~~~~~~~~~~~~~~~~
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Those selectors are looking for either an `entity` argument in the input context,
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or entity found in the result set ('rset' argument or the input context) and
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match or not according to entity's (instance or class) properties.
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.. autoclass:: cubicweb.selectors.non_final_entity
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.. autoclass:: cubicweb.selectors.implements
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.. autoclass:: cubicweb.selectors.score_entity
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.. autoclass:: cubicweb.selectors.rql_condition
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.. autoclass:: cubicweb.selectors.relation_possible
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.. autoclass:: cubicweb.selectors.partial_relation_possible
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.. autoclass:: cubicweb.selectors.has_related_entities
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.. autoclass:: cubicweb.selectors.partial_has_related_entities
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.. autoclass:: cubicweb.selectors.has_permission
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.. autoclass:: cubicweb.selectors.has_add_permission
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Logged user selectors
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~~~~~~~~~~~~~~~~~~~~~
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Those selectors are looking for properties of the user issuing the request.
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.. autoclass:: cubicweb.selectors.anonymous_user
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.. autoclass:: cubicweb.selectors.authenticated_user
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.. autoclass:: cubicweb.selectors.match_user_groups
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Web request selectors
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~~~~~~~~~~~~~~~~~~~~~
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Those selectors are looking for properties of *web* request, they can not be
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used on the data repository side.
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.. autoclass:: cubicweb.selectors.match_form_params
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.. autoclass:: cubicweb.selectors.match_search_state
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.. autoclass:: cubicweb.selectors.match_context_prop
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.. autoclass:: cubicweb.selectors.match_view
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.. autoclass:: cubicweb.selectors.primary_view
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.. autoclass:: cubicweb.selectors.specified_etype_implements
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Other selectors
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~~~~~~~~~~~~~~~
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.. autoclass:: cubicweb.selectors.match_transition
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You'll also find some other (very) specific selectors hidden in other modules
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than :mod:`cubicweb.selectors`.