Add Session#eligible_programmes_for

This adds a new method on the session class which can be used to
determine the eligible programmes for a particular patient. This logic
already exists in the service but is duplicates in a number of places,
instead we can avoid that duplication and have the logic in a single
method.

Author: thomasleese

app/models/note.rb

@@ -33,9 +33,7 @@ class Note < ApplicationRecord
 
   validates :body, presence: true, length: { maximum: 1000 }
 
-  def programmes
-    session.programmes.select { it.year_groups.include?(year_group) }
-  end
+  def programmes = session.eligible_programmes_for(year_group:)
 
   private
 

app/models/patient_session.rb

@@ -201,9 +201,7 @@ def can_record_as_already_vaccinated?(programme:)
     !session.today? && patient.vaccination_status(programme:).none_yet?
   end
 
-  def programmes
-    session.programmes.select { it.year_groups.include?(patient.year_group) }
-  end
+  def programmes = session.eligible_programmes_for(patient:)
 
   def session_status(programme:)
     session_statuses.find { it.programme_id == programme.id } ||

app/models/session.rb

@@ -164,6 +164,11 @@ def vaccine_methods
     programmes.flat_map(&:vaccine_methods).uniq.sort
   end
 
+  def eligible_programmes_for(patient: nil, year_group: nil)
+    year_group ||= patient.year_group
+    programmes.select { it.year_groups.include?(year_group) }
+  end
+
   def dates
     session_dates.map(&:value).compact
   end