Question

@orders.closed_today is an array of all orders closed for today.

How can I list get all the items for this?

i.e. @items = @orders.closed_today.items

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Update
Reports html

<% @items = Item.in_orders(@orders.closed_today) %>

Items model

scope :in_orders, lambda { |orders| where('order_id is in (?)', orders.map(&:id).join(',') ) }

Answer 1

Simple: map the items.

@items = @orders.closed_today.all(:include => :items).map(&:items)

That will give you:

=> [[item1,item2],[item2,item3]]

To get unique items:

@orders.closed_today.all(:include => :items).map(&:items).flatten.uniq

This is not a sustainable way of fetching related objects; beware N+1 performance problems.

More generally, you should probably do something like this:

class Item
  scope :closed_today, joins(:orders) & Order.closed_today
end

and just call:

Item.closed_today