Example CKAN extension with custom package controller

plugin.py

from ckan.plugins import IRoutes, implements, SingletonPlugin
from ckan.controllers.package import PackageController
from ckan.config.routing import SubMapper

class TestPackageControllerPlugin(SingletonPlugin):
    implements(IRoutes, inherit=True)

    def before_map(self, map):

        # Default mappings copied from ckan/config/routing.py that we want to preserve.
        with SubMapper(map, controller='package') as m:
            m.connect('/dataset/{action}',
            requirements=dict(action='|'.join([
                'list',
                'new',
                'autocomplete',
                'search'
                ]))
            )
            m.connect('/dataset/{action}/{id}/{revision}', action='read_ajax',
            requirements=dict(action='|'.join([
            'read',
            'edit',
            'authz',
            'history',
            ]))
            )
            m.connect('/dataset/{action}/{id}',
            requirements=dict(action='|'.join([
            'edit',
            'editresources',
            'authz',
            'history',
            'read_ajax',
            'history_ajax',
            ]))
            )
            m.connect('/dataset/{id}.{format}', action='read')
            m.connect('/dataset/{id}/resource/{resource_id}', action='resource_read')

        # Our new custom mapping.
        map.connect('/dataset/{id}',
                controller='ckanext.testpackagecontroller.plugin:TestPackageController',
                action='read',
                )


        return map

class TestPackageController(PackageController):

    def read(self, id):
        return 'foobar'

Do you know what is the correct template to replace /dataset/? Is it /{dataset_type}/ or /{type}/