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+===============
+Defining Models
+===============
+
+The first change we'll make to our bone-stock ``paster`` -generated
+application will be to define a number of :term:`model` constructors.
+For this application, which will be a Wiki, we will need two kinds of
+model constructors: a "Wiki" model constructor, and a "Page" model
+constructor.  Both our Page and Wiki constructors will be class
+objects.  A single instance of the "Wiki" class will serve as a
+container for "Page" objects, which will be instances of the "Page"
+class.
+
+The source code for this tutorial stage can be browsed via
+`http://github.com/Pylons/pyramid/tree/master/docs/tutorials/wiki/src/models/
+<http://github.com/Pylons/pyramid/tree/master/docs/tutorials/wiki/src/models/>`_.
+
+Deleting the Database
+---------------------
+
+We're going to remove the ``MyModel`` Python model class from our
+``models.py`` file.  Since this class is referred to within our
+persistent storage (represented on disk as a file named ``Data.fs``),
+we'll have strange things happen the next time we want to visit the
+application in a browser.  Remove the ``Data.fs`` from the
+``tutorial`` directory before proceeding any further.  It's always
+fine to do this as long as you don't care about the content of the
+database; the database itself will be recreated as necessary.
+
+Adding Model Classes
+--------------------
+
+The next thing we want to do is remove the ``MyModel`` class from the
+generated ``models.py`` file.  The ``MyModel`` class is only a sample
+and we're not going to use it.
+
+.. note::
+
+  There is nothing automagically special about the filename
+  ``models.py``.  A project may have many models throughout its
+  codebase in arbitrarily-named files.  Files implementing models
+  often have ``model`` in their filenames (or they may live in a
+  Python subpackage of your application package named ``models``) ,
+  but this is only by convention.
+
+Then, we'll add a ``Wiki`` class.  Because this is a ZODB application,
+this class should inherit from
+:class:`persistent.mapping.PersistentMapping`.  We want it to inherit
+from the :class:`persistent.mapping.PersistentMapping` class because
+our Wiki class will be a mapping of wiki page names to ``Page``
+objects.  The :class:`persistent.mapping.PersistentMapping` class
+provides our class with mapping behavior, and makes sure that our Wiki
+page is stored as a "first-class" persistent object in our ZODB
+database.
+
+Our ``Wiki`` class should also have a ``__name__`` attribute set to
+``None`` at class scope, and should have a ``__parent__`` attribute
+set to ``None`` at class scope as well.  If a model has a
+``__parent__`` attribute of ``None`` in a traversal-based
+:mod:`pyramid` application, it means that it's the :term:`root`
+model.  The ``__name__`` of the root model is also always ``None``.
+
+Then we'll add a ``Page`` class.  This class should inherit from the
+:class:`persistent.Persistent` class.  We'll also give it an
+``__init__`` method that accepts a single parameter named ``data``.
+This parameter will contain the :term:`ReStructuredText` body
+representing the wiki page content.  Note that ``Page`` objects don't
+have an initial ``__name__`` or ``__parent__`` attribute.  All objects
+in a traversal graph must have a ``__name__`` and a ``__parent__``
+attribute.  We don't specify these here because both ``__name__`` and
+``__parent__`` will be set by by a :term:`view` function when a Page
+is added to our Wiki mapping.
+
+Add an Appmaker
+---------------
+
+We're using a mini-framework callable named
+``PersistentApplicationFinder`` in our application (see ``run.py``).
+A ``PersistentApplicationFinder`` accepts a ZODB URL as well as an
+"appmaker" callback.  This callback typically lives in the
+``models.py`` file.
+
+We want to change the appmaker function in our ``models.py`` file so
+that our application root is a Wiki instance, and we'll also slot a
+single page object (the front page) into the wiki.
+
+Looking at the Result of Our Edits to ``models.py``
+---------------------------------------------------
+
+The result of all of our edits to ``models.py`` will end up looking
+something like this:
+
+.. literalinclude:: src/models/tutorial/models.py
+   :linenos:
+   :language: python
+
+Testing the Models
+------------------
+
+To make sure the code we just wrote works, we write tests for the
+model classes and the appmaker.  Changing ``tests.py``, we'll write a
+separate test class for each model class, and we'll write a test class
+for the ``appmaker``.
+
+To do so, we'll retain the ``tutorial.tests.ViewTests`` class provided
+as a result of the ``pyramid_zodb`` project generator.  We'll add
+three test classes: one for the ``Page`` model named
+``PageModelTests``, one for the ``Wiki`` model named
+``WikiModelTests``, and one for the appmaker named ``AppmakerTests``.
+
+When we're done changing ``tests.py``, it will look something like so:
+
+.. literalinclude:: src/models/tutorial/tests.py
+   :linenos:
+   :language: python
+
+Running the Tests
+-----------------
+
+We can run these tests by using ``setup.py test`` in the same way we
+did in :ref:`running_tests`.  Assuming our shell's current working
+directory is the "tutorial" distribution directory:
+
+On UNIX:
+
+.. code-block:: text
+
+  $ ../bin/python setup.py test -q
+
+On Windows:
+
+.. code-block::  text
+
+   c:\bigfntut\tutorial> ..\Scripts\python setup.py test -q
+
+The expected output is something like this:
+
+.. code-block:: text
+
+  .....
+  ----------------------------------------------------------------------
+  Ran 5 tests in 0.008s
+
+  OK
+
+Declaring Dependencies in Our ``setup.py`` File
+-----------------------------------------------
+
+Our application depends on packages which are not dependencies of the
+original "tutorial" application as it was generated by the ``paster
+create`` command.  We'll add these dependencies to our ``tutorial``
+package's ``setup.py`` file by assigning these dependencies to both
+the ``install_requires`` and the ``tests_require`` parameters to the
+``setup`` function.  In particular, we require the ``docutils``
+package.
+
+Our resulting ``setup.py`` should look like so:
+
+.. literalinclude:: src/models/setup.py
+   :linenos:
+   :language: python
+