[Rails] Link_to and Routing

I am a newbie to ruby/rails. I almost don't know anything about rails,
however, I am familiar with MVC3 of ASP.Net. Please help me with this
question as I am about to fail a course. :(

In my routes.rb file I have a nested resource:

root to: "parentitems#index"
resources :parentitemsdo
resources :childitems, only: [:new, :create, :destroy]
end

In my parentitems\show\.html.erb file, I am adding a link and I don't
know how to do that.

Which one of these would do the job, if any?

<%= link_to 'New Childitem', new_parentitem_childitem_url %>
<%= link_to 'New Childitem', new_parentitem_childitem_path %>

and what do I need to specify in the routes.rb file so that this link
goes to the new view for childitems?

Thanks you for the hlep.

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