Does the current user (taken from the request in the context) have
    permission to do the given action on the given item.

def filer_has_permission(context, item, action):
    """Does the current user (taken from the request in the context) have
    permission to do the given action on the given item.

    """
    permission_method_name = 'has_{action}_permission'.format(action=action)
    permission_method = getattr(item, permission_method_name, None)
    request = context.get('request')

    if not permission_method or not request:
        return False
    # Call the permission method.
    # This amounts to calling `item.has_X_permission(request)`
    return permission_method(request)