[2267] Implement training route

Add a way to calculate training routes based on funding and course type

app/models/course.rb

@@ -10,6 +10,13 @@ class Course < ApplicationRecord
 
   A_LEVEL_ATTRIBUTES = %i[a_level_subject_requirements accept_pending_a_level accept_a_level_equivalency additional_a_level_equivalencies].freeze
 
+  TRAINING_ROUTE_MAP = {
+    %w[postgraduate fee] => 'fee_funded_initial_teacher_training',
+    %w[postgraduate salary] => 'school_direct_salaried',
+    %w[postgraduate apprenticeship] => 'postgraduate_teacher_apprenticeship',
+    %w[undergraduate salary] => 'teacher_degree_apprenticeship'
+  }.freeze
+
   after_initialize :set_defaults
 
   before_discard do
@@ -752,6 +759,10 @@ def funding_type=(funding_type)
     Courses::AssignProgramTypeService.new.execute(funding_type, self)
   end
 
+  def training_route
+    TRAINING_ROUTE_MAP.fetch([course_type, funding_type], 'unknown_training_route')
+  end
+
   def ensure_site_statuses_match_study_mode
     site_statuses.not_no_vacancies.each do |site_status|
       update_vac_status(study_mode, site_status)

spec/models/course_spec.rb

@@ -3450,4 +3450,31 @@
       end
     end
   end
+
+  describe '#training_route' do
+    it 'returns teacher_degree_apprenticeship for undergraduate and salaried' do
+      course = build(:course, funding: 'salary', course_type: 'undergraduate')
+      expect(course.training_route).to eq('teacher_degree_apprenticeship')
+    end
+
+    it 'returns school_direct_salaried for postgraduate and salaried' do
+      course = build(:course, funding: 'salary', course_type: 'postgraduate')
+      expect(course.training_route).to eq('school_direct_salaried')
+    end
+
+    it 'returns postgraduate_teaching_apprenticeship for postgraduate and apprenticeship' do
+      course = build(:course, funding: 'apprenticeship', course_type: 'postgraduate')
+      expect(course.training_route).to eq('postgraduate_teacher_apprenticeship')
+    end
+
+    it 'returns fee_funded_initial_teacher_training for postgraduate and fee' do
+      course = build(:course, funding: 'fee', course_type: 'postgraduate')
+      expect(course.training_route).to eq('fee_funded_initial_teacher_training')
+    end
+
+    it 'returns unknown_training_route for unknown course_type and funding_type combination' do
+      course = build(:course, funding: 'fee', course_type: 'undergraduate')
+      expect(course.training_route).to eq('unknown_training_route')
+    end
+  end
 end