Add SessionExport model

Jira-Issue: MAV-1521

Author: MartinVanIJcken

app/models/export.rb

@@ -29,7 +29,9 @@
 #  fk_rails_...  (user_id => users.id)
 #
 class Export < ApplicationRecord
-  delegated_type :exportable, types: %w[LocationPatientsExport], dependent: :destroy
+  delegated_type :exportable,
+                 types: %w[LocationPatientsExport SessionPatientsExport],
+                 dependent: :destroy
 
   belongs_to :team
   belongs_to :user

app/models/session_patients_export.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: session_patients_exports
+#
+#  id         :bigint           not null, primary key
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#  session_id :bigint           not null
+#
+# Foreign Keys
+#
+#  fk_rails_...  (session_id => sessions.id)
+#
+class SessionPatientsExport < ApplicationRecord
+  belongs_to :session
+  has_one :export, as: :exportable, touch: true
+
+  delegate :location, to: :session
+
+  def file_type = :xlsx
+
+  def type_label = "Offline session"
+
+  def name = "#{location.name} offline session"
+
+  def filename
+    "#{location.name} (#{location.urn_and_site}) - exported on #{Date.current.to_fs(:long)}.xlsx"
+  end
+
+  def generate_file
+    Reports::OfflineExporter.from_session(session)
+  end
+end

db/migrate/20260317100000_create_session_patients_exports.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class CreateSessionPatientsExports < ActiveRecord::Migration[8.1]
+  def change
+    create_table :session_patients_exports do |t|
+      t.references :session, null: false, foreign_key: true, index: false
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -885,6 +885,12 @@
     t.index ["session_id"], name: "index_session_notifications_on_session_id"
   end
 
+  create_table "session_patients_exports", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.bigint "session_id", null: false
+    t.datetime "updated_at", null: false
+  end
+
   create_table "session_programme_year_groups", primary_key: ["session_id", "programme_type", "year_group"], force: :cascade do |t|
     t.enum "programme_type", null: false, enum_type: "programme_type"
     t.bigint "session_id", null: false
@@ -1220,6 +1226,7 @@
   add_foreign_key "session_notifications", "patients"
   add_foreign_key "session_notifications", "sessions"
   add_foreign_key "session_notifications", "users", column: "sent_by_user_id"
+  add_foreign_key "session_patients_exports", "sessions"
   add_foreign_key "session_programme_year_groups", "sessions", on_delete: :cascade
   add_foreign_key "sessions", "team_locations"
   add_foreign_key "subteams", "teams"

spec/factories/session_patients_exports.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: session_patients_exports
+#
+#  id         :bigint           not null, primary key
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#  session_id :bigint           not null
+#
+# Foreign Keys
+#
+#  fk_rails_...  (session_id => sessions.id)
+#
+FactoryBot.define do
+  factory :session_patients_export do
+    session
+  end
+end

spec/models/session_patients_export_spec.rb

@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: session_patients_exports
+#
+#  id         :bigint           not null, primary key
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#  session_id :bigint           not null
+#
+# Foreign Keys
+#
+#  fk_rails_...  (session_id => sessions.id)
+#
+describe SessionPatientsExport do
+  subject(:export) { create(:session_patients_export, session:) }
+
+  let(:programme) { Programme.hpv }
+  let(:team) { create(:team, :with_one_nurse, programmes: [programme]) }
+  let(:location) { create(:gias_school, team:, programmes: [programme]) }
+  let(:session) { create(:session, team:, location:, programmes: [programme]) }
+
+  it { should be_valid }
+
+  describe "#name" do
+    subject { export.name }
+
+    it { should eq("#{location.name} offline session") }
+  end
+
+  describe "#filename" do
+    subject(:filename) { export.filename }
+
+    it "includes location name, URN/site, and export date" do
+      date_str = export.created_at.to_date.to_fs(:long)
+      expect(filename).to eq(
+        "#{location.name} (#{location.urn_and_site}) - exported on #{date_str}.xlsx"
+      )
+    end
+  end
+end