Add backwards compatibility with the current (v1) results page

On the live (v1) results page there are no fee and apprenticeship
filters, only salary and these is treated as a string "salary".

We want to add a collection now, so adding this compatibility to
make work

app/controllers/find/v2/results_controller.rb

@@ -21,6 +21,7 @@ def search_courses_params
           :send_courses,
           :applications_open,
           :further_education,
+          :funding,
           study_types: [],
           qualifications: [],
           funding: []

spec/features/find/v2/results/search_results_enabled_spec.rb

@@ -110,6 +110,13 @@
       and_i_see_that_there_are_two_courses_found
     end
 
+    scenario 'when I use the old funding parameter' do
+      when_i_visit_the_find_results_page_using_old_salary_parameter
+      then_i_see_only_salaried_courses
+      and_the_salary_filter_is_checked
+      and_i_see_that_there_is_one_course_found
+    end
+
     scenario 'when I filter by apprenticeship' do
       when_i_visit_the_find_results_page
       and_i_filter_by_apprenticeship_courses
@@ -191,6 +198,10 @@ def when_i_visit_the_find_results_page
     visit find_v2_results_path
   end
 
+  def when_i_visit_the_find_results_page_using_old_salary_parameter
+    visit(find_v2_results_path(funding: 'salary'))
+  end
+
   def and_i_filter_by_courses_that_sponsor_visa
     check 'Only show courses with visa sponsorship'
     and_i_apply_the_filters

spec/services/courses_query_spec.rb

@@ -241,6 +241,17 @@
         end
       end
 
+      context 'when filter by salary in the old search parameter' do
+        let(:params) { { funding: 'salary' } }
+
+        it 'returns courses with salary' do
+          expect(results).to match_collection(
+            [salaried_course],
+            attribute_names: %w[funding]
+          )
+        end
+      end
+
       context 'when filter by two funding types' do
         let(:params) { { funding: %w[fee salary] } }