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authorCasey Duncan <casey.duncan@gmail.com>2010-12-31 18:24:18 -0700
committerCasey Duncan <casey.duncan@gmail.com>2010-12-31 18:24:18 -0700
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Remove resource location chapter and move intro parts to url dispatch. The new much ado about traversal chapter takes care of selling traversal now
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-.. index::
- single: resource location
-
-.. _resourcelocation_chapter:
-
-Resource Location and View Lookup
----------------------------------
-
-:app:`Pyramid` uses two separate but cooperating subsystems to find and
-invoke :term:`view callable` code written by the application developer:
-:term:`resource location` and :term:`view lookup`.
-
-- First, a :app:`Pyramid` :term:`resource location` subsystem is given a
- :term:`request`; it is responsible for finding a :term:`resource` object
- based on information present in the request. When a resource is found via
- resource location, it becomes known as the :term:`context`.
-
-- Next, using the context resource found by :term:`resource location` and the
- :term:`request`, :term:`view lookup` is then responsible for finding and
- invoking a :term:`view callable`. A view callable is a specific bit of
- code written and registered by the application developer which receives the
- :term:`request` and which returns a :term:`response`.
-
-These two subsystems are used by :app:`Pyramid` serially: first, a
-:term:`resource location` subsystem does its job. Then the result of
-resource location is passed to the :term:`view lookup` subsystem. The view
-lookup system finds a :term:`view callable` written by an application
-developer, and invokes it. A view callable returns a :term:`response`. The
-response is returned to the requesting user.
-
-There are two separate :term:`resource location` subsystems in
-:app:`Pyramid`: :term:`traversal` and :term:`URL dispatch`. They can be used
-separately or they can be combined. Three chapters which follow describe
-:term:`resource location`: :ref:`traversal_chapter`,
-:ref:`urldispatch_chapter` and :ref:`hybrid_chapter`.
-
-There is only one :term:`view lookup` subsystem present in :app:`Pyramid`.
-Where appropriate, we will describe how view lookup interacts with context
-finding. One chapter which follows describes :term:`view lookup`:
-:ref:`views_chapter`.
-
-Should I Use Traversal or URL Dispatch for Resource Location?
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-When you use :app:`Pyramid`, you have a choice about how you'd like to
-resolve URLs to code: you can use either :term:`traversal` or :term:`URL
-dispatch`. The choice to use traversal vs. URL dispatch is largely
-"religious". Since :app:`Pyramid` provides support for both approaches, you
-can use either exclusively or combine them as you see fit.
-
-:term:`URL dispatch` is very straightforward. When you limit your
-application to using URL dispatch, you know every URL that your application
-might generate or respond to, all the URL matching elements are listed in a
-single place, and you needn't think about :term:`resource location` or
-:term:`view lookup` at all.
-
-URL dispatch can easily handle URLs such as
-``http://example.com/members/Chris``, where it's assumed that each item
-"below" ``members`` in the URL represents a single member in some system.
-You just match everything "below" ``members`` to a particular :term:`view
-callable`, e.g. ``/members/{memberid}``.
-
-However, URL dispatch is not very convenient if you'd like your URLs to
-represent an arbitrary-depth hierarchy. For example, if you need to infer
-the difference between sets of URLs such as these, where the ``document`` in
-the first URL represents a PDF document, and ``/stuff/page`` in the second
-represents an OpenOffice document in a "stuff" folder.
-
-.. code-block:: text
-
- http://example.com/members/Chris/document
- http://example.com/members/Chris/stuff/page
-
-It takes more pattern matching assertions to be able to make hierarchies work
-in URL-dispatch based systems, and some assertions just aren't possible.
-URL-dispatch based systems just don't deal very well with URLs that represent
-arbitrary-depth hierarchies.
-
-:term:`URL dispatch` tends to collapse the two steps of :term:`resource
-location` and :term:`view lookup` into a single step. Thus, a URL can map
-*directly* to a view callable. This makes URL dispatch easier to understand
-than traversal, because traversal makes you understand how :term:`resource
-location` works. But explicitly locating a resource provides extra
-flexibility. For example, it makes it possible to protect your application
-with declarative context-sensitive instance-level :term:`authorization`.
-
-Unlike URL dispatch, :term:`traversal` works well for URLs that represent
-arbitrary-depth hierarchies. Since the path segments that compose a URL are
-addressed separately, it becomes very easy to form URLs that represent
-arbitrary depth hierarchies in a system that uses traversal. When you're
-willing to treat your application resources as a tree that can be traversed,
-it also becomes easy to provide "instance-level security": you just attach an
-:term:`ACL` security declaration to each resource in the tree. This is not
-nearly as easy to do when using URL dispatch.
-
-Traversal probably just doesn't make any sense when you possess completely
-"square" data stored in a relational database because it requires the
-construction and maintenance of a resource tree and requires that the
-developer think about mapping URLs to code in terms of traversing that tree.
-
-We'll examine both :term:`URL dispatch` and :term:`traversal` in the next two
-chapters.
-