[ckan-dev] Database hooks (IMapper)

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I’d like to be able to perform some operations on related objects when some are deleted, and it would seem from the documentation that extending IMapper in a plugin is what is required:

http://docs.ckan.org/en/latest/extensions/plugin-interfaces.html

Therefore, I would expect this to work:

import ckan.plugins as plugins

class TeSSPlugin(plugins.SingletonPlugin, toolkit.DefaultDatasetForm):
    plugins.implements(plugins.IMapper, inherit=True)

    def before_delete(self, mapper, connection, instance):
	log(“About to delete: %r", instance)
	# do some stuff here…


However, this code is never called. Is there anything I’m missing here?

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