Controller response

app/controllers/case_logs_controller.rb

@@ -8,6 +8,11 @@ class CaseLogsController < ApplicationController
 
   def index
     @pagy, @case_logs = pagy(current_user.case_logs)
+
+    respond_to do |format|
+      format.html
+      format.csv { send_data @case_logs.to_csv, filename: "case-logs-#{Time.zone.now}" }
+    end
   end
 
   def create

app/models/case_log.rb

@@ -18,6 +18,7 @@ end
 
 class CaseLog < ApplicationRecord
   include Validations::SoftValidations
+  include GenerateCsv
 
   has_paper_trail
 

app/models/concerns/generate_csv.rb

@@ -0,0 +1,15 @@
+module GenerateCsv
+  extend ActiveSupport::Concern
+
+  class_methods do
+    def to_csv
+      CSV.generate(headers: true) do |csv|
+        csv << self.attribute_names
+
+        all.each do |record|
+          csv << record.attributes.values
+        end
+      end
+    end
+  end
+end

spec/requests/case_logs_controller_spec.rb

@@ -400,6 +400,32 @@ RSpec.describe CaseLogsController, type: :request do
     end
   end
 
+  describe "CSV download" do
+    let(:headers) { { "Accept" => "text/csv" } }
+    let(:user) { FactoryBot.create(:user) }
+    let(:organisation) { user.organisation }
+    let(:other_organisation) { FactoryBot.create(:organisation) }
+    let!(:case_log) do
+      FactoryBot.create(
+        :case_log,
+        owning_organisation: organisation,
+        managing_organisation: organisation,
+      )
+    end
+
+    before do
+      sign_in user
+      get "/logs", headers: headers, params: {}
+    end
+
+    it "downloads a CSV file with headers" do
+      csv = CSV.parse(response.body)
+      expect(csv.count).to eq(2)
+      expect(csv.first.first).to eq("id")
+      expect(csv.second.first).to eq(case_log.id.to_s)
+    end
+  end
+
   describe "PATCH" do
     let(:case_log) do
       FactoryBot.create(:case_log, :in_progress, tenant_code: "Old Value", postcode_full: "M1 1AE")