refactor: update matadata helper

app/helpers/collection_resources_helper.rb

@@ -1,13 +1,15 @@
 module CollectionResourcesHelper
-  def metadata_helper(file, pages = nil)
-    extension = file.split(".")[-1]
-    type_string = case extension
-                  when "xlsx" then "Microsoft Excel"
-                  when "pdf" then "PDF"
-                  else extension
-                  end
-    size = number_to_human_size(File.size("public/files/#{file}"), precision: 0, significant: false)
-    pages_string = pages.present? ? pluralize(pages, "page") : nil
-    [type_string, size, pages_string].compact.join(", ")
+  def file_type_size_and_pages(file, number_of_pages: nil)
+    extension_mapping = {
+      "xlsx" => "Microsoft Excel",
+      "pdf" => "PDF",
+    }
+    extension = File.extname(file)[1..]
+
+    file_type = extension_mapping.fetch(extension, extension)
+
+    file_size = number_to_human_size(File.size("public/files/#{file}"), precision: 0, significant: false)
+    file_pages = number_of_pages ? pluralize(number_of_pages, "page") : nil
+    [file_type, file_size, file_pages].compact.join(", ")
   end
 end

app/views/layouts/_collection_resources.html.erb

@@ -7,22 +7,22 @@
     {
       name: "Lettings log for tenants (2023/24)",
       href: download_23_24_lettings_form_path,
-      metadata: metadata_helper("2023_24_lettings_paper_form.pdf", 8),
+      metadata: file_type_size_and_pages("2023_24_lettings_paper_form.pdf", number_of_pages: 8),
     },
     {
       name: "Lettings bulk upload template (2023/24) – New question ordering",
       href: download_23_24_lettings_bulk_upload_template_path,
-      metadata: metadata_helper("bulk-upload-lettings-template-2023-24.xlsx"),
+      metadata: file_type_size_and_pages("bulk-upload-lettings-template-2023-24.xlsx"),
     },
     {
       name: "Lettings bulk upload template (2023/24)",
       href: download_23_24_lettings_bulk_upload_legacy_template_path,
-      metadata: metadata_helper("bulk-upload-lettings-legacy-template-2023-24.xlsx"),
+      metadata: file_type_size_and_pages("bulk-upload-lettings-legacy-template-2023-24.xlsx"),
     },
     {
       name: "Lettings bulk upload specification (2023/24)",
       href: download_23_24_lettings_bulk_upload_specification_path,
-      metadata: metadata_helper("bulk-upload-lettings-specification-2023-24.xlsx"),
+      metadata: file_type_size_and_pages("bulk-upload-lettings-specification-2023-24.xlsx"),
     },
   ]) %>
 
@@ -31,22 +31,22 @@
     {
       name: "Sales log for buyers (2023/24)",
       href: download_23_24_sales_form_path,
-      metadata: metadata_helper("2023_24_sales_paper_form.pdf", 8),
+      metadata: file_type_size_and_pages("2023_24_sales_paper_form.pdf", number_of_pages: 8),
     },
     {
       name: "Sales bulk upload template (2023/24) – New question ordering",
       href: download_23_24_sales_bulk_upload_template_path,
-      metadata: metadata_helper("bulk-upload-sales-template-2023-24.xlsx"),
+      metadata: file_type_size_and_pages("bulk-upload-sales-template-2023-24.xlsx"),
     },
     {
       name: "Sales bulk upload template (2023/24)",
       href: download_23_24_sales_bulk_upload_legacy_template_path,
-      metadata: metadata_helper("bulk-upload-sales-legacy-template-2023-24.xlsx"),
+      metadata: file_type_size_and_pages("bulk-upload-sales-legacy-template-2023-24.xlsx"),
     },
     {
       name: "Sales bulk upload specification (2023/24)",
       href: download_23_24_sales_bulk_upload_specification_path,
-      metadata: metadata_helper("bulk-upload-sales-specification-2023-24.xlsx"),
+      metadata: file_type_size_and_pages("bulk-upload-sales-specification-2023-24.xlsx"),
     },
   ]) %>
 
@@ -55,17 +55,17 @@
     {
       name: "Lettings log for tenants (2022/23)",
       href: download_22_23_lettings_form_path,
-      metadata: metadata_helper("2022_23_lettings_paper_form.pdf", 4),
+      metadata: file_type_size_and_pages("2022_23_lettings_paper_form.pdf", number_of_pages: 4),
     },
     {
       name: "Lettings bulk upload template (2022/23)",
       href: download_22_23_lettings_bulk_upload_template_path,
-      metadata: metadata_helper("bulk-upload-lettings-template-2022-23.xlsx"),
+      metadata: file_type_size_and_pages("bulk-upload-lettings-template-2022-23.xlsx"),
     },
     {
       name: "Lettings bulk upload specification (2022/23)",
       href: download_22_23_lettings_bulk_upload_specification_path,
-      metadata: metadata_helper("bulk-upload-lettings-specification-2022-23.xlsx"),
+      metadata: file_type_size_and_pages("bulk-upload-lettings-specification-2022-23.xlsx"),
     },
   ]) %>
 
@@ -74,17 +74,17 @@
     {
       name: "Sales log for buyers (2022/23)",
       href: download_22_23_sales_form_path,
-      metadata: metadata_helper("2022_23_sales_paper_form.pdf", 5),
+      metadata: file_type_size_and_pages("2022_23_sales_paper_form.pdf", number_of_pages: 5),
     },
     {
       name: "Sales bulk upload template (2022/23)",
       href: download_22_23_sales_bulk_upload_template_path,
-      metadata: metadata_helper("bulk-upload-sales-template-2022-23.xlsx"),
+      metadata: file_type_size_and_pages("bulk-upload-sales-template-2022-23.xlsx"),
     },
     {
       name: "Sales bulk upload specification (2022/23)",
       href: download_22_23_sales_bulk_upload_specification_path,
-      metadata: metadata_helper("bulk-upload-sales-template-2022-23.xlsx"),
+      metadata: file_type_size_and_pages("bulk-upload-sales-template-2022-23.xlsx"),
     },
   ]) %>
 </div>

spec/helpers/collection_resources_helper_spec.rb

@@ -7,13 +7,13 @@ RSpec.describe CollectionResourcesHelper do
   describe "when displaying file metadata" do
     context "with pages" do
       it "returns correct metadata" do
-        expect(metadata_helper("2023_24_lettings_paper_form.pdf", 8)).to eq("PDF, 286 KB, 8 pages")
+        expect(file_type_size_and_pages("2023_24_lettings_paper_form.pdf", number_of_pages: 8)).to eq("PDF, 286 KB, 8 pages")
       end
     end
 
     context "without pages" do
       it "returns correct metadata" do
-        expect(metadata_helper("bulk-upload-lettings-template-2023-24.xlsx")).to eq("Microsoft Excel, 15 KB")
+        expect(file_type_size_and_pages("bulk-upload-lettings-template-2023-24.xlsx")).to eq("Microsoft Excel, 15 KB")
       end
     end
   end