Question

In my controller I have an instant variable with a where method, its part of a filter in the Search Controller.

@items = @items.where([ 'borrowable = ?', true]) if params[:top_filter] == 'borrow'

The borrowable = ?, true bit is completely wrong. What I want is to filter the @items that are borrowable by using a method in the Item's model called borrowable?.

How do I do this?

The method in the Item model is below.

    def borrowable?(current_user, user, item, controller)
      false
      if user.invited?(current_user, user)
        item.pieces.each do |piece|
          if piece.available?(current_user, piece)
            true
          end
        end
        if controller == "pages"
          true
        end
      end
    end

Answer 1

If it’s relying on model level code, then you won’t be able to put it in a where clause. The where clause is trying to grab a list of items, but on each item you want to call a method, but you don’t have the method until your grab the items. You could potentially use a stored procedure on the DB, but just in Rails code you could do this:

@items = @items.keep_if { |item| item.borrowable? } if params[:top_filter] == 'borrow'