Rails, how to use searchlogic to reorder returned objects - ruby-on-rails

Question

So I have had various forms of this working in the last while, but never all working together.
for reference I have categories / Brands / Products, with the right relationships working: the site is http://emeraldcityguitars.com to see it in action.
So in my brands controller show action:
#category = Category.find_by_url_name(params[:category_id])
#brand = Brand.find(params[:id])
#search = Product.brand_id_equals(#brand.id).category_id_equals(#category.id).descend_by_price
#products = #search.paginate(:page => params[:page])
this works fine, as is evidenced in my log:
Category Load (25.6ms) SELECT * FROM "categories"
Category Load (0.2ms) SELECT * FROM "categories" WHERE ("categories"."url_name" = 'acoustic-guitars') LIMIT 1
Brand Load (0.6ms) SELECT * FROM "brands" WHERE ("brands"."id" = 14)
Product Load (4.8ms) SELECT * FROM "products" WHERE ((products.category_id = 3) AND (products.brand_id = 14)) ORDER BY products.price DESC LIMIT 6 OFFSET 0
SQL (0.2ms) SELECT count(*) AS count_all FROM "products" WHERE ((products.category_id = 3) AND (products.brand_id = 14))
Rendering template within layouts/application
Rendering brands/show
You can see that its grabbing products descending by price.
In my Brand#show I am doing the following:
<%- form_for [#category, #brand], :html => {:method => 'get', :id => 'sort_form', :class => 'sort_form'} do -%>
<label>Sort by: </label> <%= select_tag :order, product_sort_options %>
<%= submit_tag 'Go' %>
<%- end -%>
The goal being that a user could sort by a couple different options.
I also have this in my products_helper:
def product_sort_options
options_for_select([
['', nil],
['Newest to Oldest', 'descend_by_date'],
['Oldest to Newest', 'ascend_by_date'],
['Price: Highest to Lowest', 'descend_by_price'],
['Price: Lowest to Highest', 'ascend_by_price'],
['Name', 'ascend_by_name']
])
end
The issue I am having is that if I click the drop down and do price lowest to highest it reloads the page, with "?order=ascend_by_price" at the end of the url but there is no change in the order of the products.
any help is appreciated.

Answer 1

You'll need to add in a call to include the value of your :order parameter. It only gets included in the search by default if you're doing something like Product.search(params[:search]) (and the order parameter would then have to be in params[:search][:order]).
So, something like this should work:
#search = Product.brand_id_equals(#brand.id)
#search.category_id_equals(#category.id)
#search.order(params[:order] || :descend_by_price)
I've split it out to make it easier to read. The last line specifies to order by the value of your order parameter or the default ordering if that's not available.