Overide logic function example

override logic.py

from ckan.plugins import implements, SingletonPlugin, IConfigurable, IActions
from ckan.logic.get import vocabulary_show

## override the logic function, just add for_view in the context
## this will only work for this 'vocabulary show' api call. 

def my_vocabulary_show(context, data_dict):
    context['for_view'] = True
    return vocabulary_show(context, data_dict)

class YourExtension(SigletonPlugin):
    implements(IActions, inherit=True)
    
    ## the IAction extension returns a dictionary of core actions it wants to override.
    def get_actions():
        return {'vocabulary_show': my_vocabulary_show}