Use Patient#approved_vaccine_methods

This ensures that when sending emails that list vaccine side effects,
we're only include the side effects for the vaccines that the patient is
approved for. In most cases this has no effect, but for Flu it's
possible to be approved for either nasal or injection vaccines and
therefore we should only show the approriate vaccine methods.

Jira-Issue: MAV-1355

Author: thomasleese

app/lib/govuk_notify_personalisation.rb

@@ -293,7 +293,18 @@ def vaccine_side_effects
       if vaccination_record
         vaccination_record.vaccine&.side_effects
       elsif programmes.present?
-        Vaccine.where(programme: programmes).flat_map(&:side_effects)
+        if patient
+          programmes.flat_map do |programme|
+            # We pick the first method as it's the one most likely to be used
+            # to vaccinate the patient. For example, in the case of Flu, the
+            # parents will approve nasal (and then optionally injection).
+            method = patient.approved_vaccine_methods(programme:).first
+
+            Vaccine.where(programme:, method:).flat_map(&:side_effects)
+          end
+        else
+          Vaccine.where(programme: programmes).flat_map(&:side_effects)
+        end
       end
 
     return if side_effects.nil?

spec/lib/govuk_notify_personalisation_spec.rb

@@ -248,13 +248,27 @@
       programmes.first.vaccines.first.update!(side_effects: %w[swelling unwell])
     end
 
-    it do
-      expect(to_h).to match(
-        hash_including(
-          vaccine_side_effects:
-            "- generally feeling unwell\n- swelling or pain where the injection was given"
+    it { should include(vaccine_side_effects: "") }
+
+    context "with injection as an approved vaccine method" do
+      before do
+        create(
+          :patient_triage_status,
+          :safe_to_vaccinate,
+          :injection,
+          patient:,
+          programme: programmes.first
         )
-      )
+      end
+
+      it do
+        expect(to_h).to match(
+          hash_including(
+            vaccine_side_effects:
+              "- generally feeling unwell\n- swelling or pain where the injection was given"
+          )
+        )
+      end
     end
   end
 end