Move taxon filter list to frontend

These are only really valid in the frontend, and don't we don't gain
anything by it living inside of core.

This moves us forward to being able to deprecate
Spree::Taxon.applicable_filters

frontend/app/controllers/spree/products_controller.rb

@@ -5,7 +5,7 @@ class ProductsController < Spree::StoreController
  before_action :load_product, only: :show
  before_action :load_taxon, only: :index
 
- helper 'spree/taxons'
+ helper 'spree/taxons', 'spree/taxon_filters'
 
  respond_to :html
 

frontend/app/controllers/spree/taxons_controller.rb

@@ -2,7 +2,7 @@
 
 module Spree
  class TaxonsController < Spree::StoreController
- helper 'spree/products'
+ helper 'spree/products', 'spree/taxon_filters'
 
  respond_to :html
 

frontend/app/helpers/spree/taxon_filters_helper.rb

@@ -0,0 +1,11 @@
+require 'spree/core/product_filters'
+
+module Spree
+ module TaxonFiltersHelper
+ def applicable_filters_for(_taxon)
+ [:brand_filter, :price_filter].map do |filter_name|
+ Spree::Core::ProductFilters.send(filter_name) if Spree::Core::ProductFilters.respond_to?(filter_name)
+ end.compact
+ end
+ end
+end

frontend/app/views/spree/shared/_filters.html.erb

@@ -1,4 +1,4 @@
-<% filters = @taxon.applicable_filters %>
+<% filters = applicable_filters_for(@taxon) %>
 <% unless filters.empty? %>
  <%= form_tag '', method: :get, id: 'sidebar_products_search' do %>
  <%= hidden_field_tag 'per_page', params[:per_page] %>

frontend/spec/helpers/taxon_filters_helper_spec.rb

@@ -0,0 +1,10 @@
+require 'spec_helper'
+
+RSpec.describe Spree::TaxonFiltersHelper, type: :helper do
+ let(:taxon) { nil }
+ subject { applicable_filters_for(taxon) }
+
+ it "returns the price/brand filters" do
+ expect(subject.map { |y| y[:name] }).to eq ['Brands', 'Price Range']
+ end
+end