Refactor subject and date information retrieval in Candidates::Regist…

…rations::SubjectAndDateInformation.rb

* Exclude hidden subjects from `placement_date_subjects` query
*Refactor `#placement_date_subject` in `subject_and_date_information.rb` to use `find_placement_date_subject` method
*  update specs to reflect changes to the model

app/services/candidates/registrations/subject_and_date_information.rb

@@ -16,14 +16,11 @@ def placement_date
       end
 
       def placement_date_subject
-        @placement_date_subject ||= Bookings::PlacementDateSubject.find_by(
-          bookings_placement_date_id: bookings_placement_date_id,
-          bookings_subject_id: bookings_subject_id
-        )
+        @placement_date_subject ||= find_placement_date_subject
       end
 
       def bookings_subject
-        @bookings_subject ||= Bookings::Subject.find_by(id: bookings_subject_id)
+        @bookings_subject ||= find_bookings_subject
       end
 
       def date_and_subject_ids
@@ -73,6 +70,19 @@ def secondary_placement_dates_grouped_by_date
           .flatten
           .group_by(&:date)
       end
+
+    private
+
+      def find_placement_date_subject
+        Bookings::PlacementDateSubject
+          .joins(:bookings_subject)
+          .where(bookings_placement_date_id: bookings_placement_date_id, bookings_subjects: { id: bookings_subject_id, hidden: false })
+          .first
+      end
+
+      def find_bookings_subject
+        Bookings::Subject.find_by(id: bookings_subject_id, hidden: false)
+      end
     end
   end
 end

db/data/subjects.yml

@@ -21,10 +21,8 @@
 - Music
 - Physical Education
 - Physics
-- Physics with maths
 - Primary
 - Psychology
 - Religious Education
 - Social Sciences
 - Spanish
-- Vocational health

spec/services/candidates/registrations/subject_and_date_information_spec.rb

@@ -105,14 +105,11 @@
         subject.bookings_subject_id = 2
       end
 
-      before { allow(Bookings::PlacementDateSubject).to receive(:find_by).and_return('a') }
+      before { allow(subject).to receive(:find_placement_date_subject).and_return('a') }
 
       specify 'should find the placement date via its id' do
         subject.placement_date_subject
-        expect(Bookings::PlacementDateSubject).to have_received(:find_by).with(
-          bookings_placement_date_id: 1,
-          bookings_subject_id: 2
-        )
+        expect(subject).to have_received(:find_placement_date_subject)
       end
     end