It is not Plan's view, so I specified :controller as well.
I think the reason that it is not working is that you have not
specified :method => delete. If you look at one of your delete links
that works you will find that is specified. However there is no need
to specify the controller or action, rails will work out what to do
based on the type of the object, it is nothing to do with which view
you are in, so
link_to 'Delete', give, confirm: 'Are you sure?', :method => :delete
should work.