[ckan-dev] 2.2 extension not working in 2.4

[David]

Hi.

I have been using this piece of code to show most popular groups in 
version 2.2

Now I have updated to 2.4 and it seems not work properly

*plugin.py*
import ckan.plugins as plugins
import ckan.plugins.toolkit as toolkit

def most_popular_groups():
     '''Return a sorted list of the groups with the most datasets.'''

     # Get a list of all the site's groups from CKAN, sorted by number of
     # datasets.
     groups = toolkit.get_action('group_list')(
             data_dict={'sort': 'packages desc', 'all_fields': True})

     # Truncate the list to the 10 most popular groups only.
     # groups = groups[:10]

     return groups


class MyPlugin(plugins.SingletonPlugin):

     '''
     # Declare that this class implements IConfigurer.
     plugins.implements(plugins.IConfigurer)

     # Declare that this plugin will implement ITemplateHelpers.
     plugins.implements(plugins.ITemplateHelpers)

     def update_config(self, config):

         # Add this plugin's templates dir to CKAN's 
extra_template_paths, so
         # that CKAN will use this plugin's custom templates.
         toolkit.add_template_directory(config, 'templates')


         # Add this plugin's public dir to CKAN's extra_public_paths, so
         # that CKAN will use this plugin's custom static files.
         toolkit.add_public_directory(config, 'public')

     def get_helpers(self):
         '''Register the most_popular_groups() function above as a template
         helper function.

         '''
         # Template helper function names should begin with the name of the
         # extension they belong to, to avoid clashing with functions from
         # other extensions.
         return {'my_most_popular_groups': most_popular_groups}

---------------------------------------------------------------------------------------------------------------------------------
*Now in version 2.4*
import ckan.plugins as plugins
import ckan.plugins.toolkit as toolkit

def most_popular_groups():
     '''Return a sorted list of the groups with the most datasets.'''

     # Get a list of all the site's groups from CKAN, sorted by number of
     # datasets.
     groups = toolkit.get_action('group_list')(
             data_dict={'sort': 'packages desc', 'all_fields': True})

     # Truncate the list to the 10 most popular groups only.
     # groups = groups[:10]

     return groups


class MyPlugin(plugins.SingletonPlugin):
     # IConfigurer
     plugins.implements(plugins.IConfigurer)


     # Declare that this plugin will implement ITemplateHelpers.
     plugins.implements(plugins.ITemplateHelpers)


     def update_config(self, config_):
         toolkit.add_template_directory(config_, 'templates')
         toolkit.add_public_directory(config_, 'public')


     def get_helpers(self):
         '''Register the most_popular_groups() function above (arriba) as
            a template  helper function.

         '''
         # Template helper function names should begin with the name of the
         # extension they belong to, to avoid clashing with functions from
         # other extensions.
         return {'my_most_popular_groups': most_popular_groups}

Setup.py have changed in version 2.4, but I can't understand where is 
the problem. The rest of the installation works ok .

Thanks

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