28 ``SimpleReqRewriter`` is enough for a certain number of simple cases. If it is not sufficient, ``SchemaBasedRewriter`` allows to do more elaborate things.

    29 

    30 Here is an example of ``SimpleReqRewriter`` usage with plain string:

    31 

    32 .. sourcecode:: python

    33 

    34    from cubicweb.web.views.urlrewrite import SimpleReqRewriter

    35    class TrackerSimpleReqRewriter(SimpleReqRewriter):

    36        rules = [

    37         ('/versions', dict(vid='versionsinfo')),

    38         ]

    39 

    40 When the url is `<base_url>/versions`, the view with the __regid__ `versionsinfo` is displayed.

    41 

    42 Here is an example of ``SimpleReqRewriter`` usage with regular expressions:

    43 

    44 .. sourcecode:: python

    45 

    46     from cubicweb.web.views.urlrewrite import (

    47         SimpleReqRewriter, rgx)

    48 

    49     class BlogReqRewriter(SimpleReqRewriter):

    50         rules = [

    51             (rgx('/blogentry/([a-z_]+)\.rss'),

    52              dict(rql=('Any X ORDERBY CD DESC LIMIT 20 WHERE X is BlogEntry,'

    53                        'X creation_date CD, X created_by U, '

    54                        'U login "%(user)s"'

    55                        % {'user': r'\1'}, vid='rss'))),

    56             ]

    57 

    58 When a url matches the regular expression, the view with the __regid__

    59 `rss` which match the result set is displayed.

    60 

    61 Here is an example of ``SchemaBasedRewriter`` usage:

    62 

    63 .. sourcecode:: python

    64 

    65     from cubicweb.web.views.urlrewrite import (

    66         SchemaBasedRewriter, rgx, build_rset)

    67 

    68     class TrackerURLRewriter(SchemaBasedRewriter):

    69         rules = [

    70             (rgx('/project/([^/]+)/([^/]+)/tests'),

    71              build_rset(rql='Version X WHERE X version_of P, P name %(project)s, X num %(num)s',

    72                         rgxgroups=[('project', 1), ('num', 2)], vid='versiontests')),

    73             ]