Postgresql Cursor in Ruby on Rails

Question

How do I view the contents of a returns Postgresql cursor?

I have a custom function in Postgresql that returns a cursor. In Rails the returned values looks like an array that contains:

#<Order:0x007f6b63a49220> and #<Order:0x007f6b63a49040>

when I try to view the contents of these using .first or [0] I get an error

edit:

index.html.erb

<p><% @results %>
<p><% @results.each do |k,v| %>
        <p><%= "key: #{k}" %></p>
        <p><%= "value: #{v}" %></p>
<% end %></p>

test_controller.erb

@results = Order.retention_data(shop_id)

YYYYMMDD__add_process_functionstToDb.rb

class AddProcessFunctionstToDb < ActiveRecord::Migration
  def up
    funcs = File.read(Rails.root.join('db', 'migrate', 'processfunctions.sql').to_s)
    execute funcs
  end
  def down
  end
end

processfunctions.sql

drop function if exists retention_data(ref refcursor, shopId integer);
create or replace function retention_data(ref refcursor, shopId integer) returns refcursor as $$
    begin
    open ref for
...
    close ref;
    return ref;
    end;
$$ language plpgsql;

edit2:

I tried

k.attribute_names

and it returned

"retention_data", "id"

they returned:

k.retention_data #> x (the name of the cursor)
k.id #> (nothing)

others:

@results.responds_to? #>undefined method `responds_to?' for #<ActiveRecord::Relation [#<Order id: nil>, #<Order id: nil>]>