Resolve #4746: Add total of FMVs to Purchase Index; Fix pagination of Amount spent (#4847)

* feat: add total amount spent and FMV with pagination behaviour

* fix: use paginated_purchases to calculate paginated_fair_market_values

* fixing mis-merge

---------

Co-authored-by: CL Fisher <cielf@users.noreply.github.com>
Co-authored-by: CL Fisher <clfisher@rogers.com>

Author: Hungle2911

app/controllers/purchases_controller.rb

@@ -13,9 +13,16 @@ def index
     @paginated_purchases = @purchases.page(params[:page])
     # Are these going to be inefficient with large datasets?
     # Using the @purchases allows drilling down instead of always starting with the total dataset
+    # Purchase quantity
     @purchases_quantity = @purchases.collect(&:total_quantity).sum
     @paginated_purchases_quantity = @paginated_purchases.collect(&:total_quantity).sum
+    # Purchase value
     @total_value_all_purchases = @purchases.sum(&:amount_spent_in_cents)
+    @paginated_purchases_value = @paginated_purchases.collect(&:amount_spent_in_cents).sum
+    # Fair Market Values
+    @total_fair_market_values = @purchases.sum(&:value_per_itemizable)
+    @paginated_fair_market_values = @paginated_purchases.collect(&:value_per_itemizable).sum
+    # Storage and Vendor
     @storage_locations = current_organization.storage_locations.active_locations
     @selected_storage_location = filter_params[:at_storage_location]
     @vendors = current_organization.vendors.sort_by { |vendor| vendor.business_name.downcase }

app/views/purchases/index.html.erb

@@ -102,7 +102,20 @@
                   <%= @paginated_purchases_quantity %> (This page)
                 </td>
                 <td></td>
-                <td class="numeric"><strong><%= dollar_value(@total_value_all_purchases) %></strong></td>
+                <td class="numeric">
+                  <strong>
+                    <%= dollar_value(@total_value_all_purchases) %> (Total)
+                  </strong>
+                  <br>
+                  <%= dollar_value(@paginated_purchases_value) %> (This page)
+                  </td>
+                  <td class="numeric">
+                  <strong>
+                    <%= dollar_value(@total_fair_market_values) %> (Total)
+                  </strong>
+                  <br>
+                  <%= dollar_value(@paginated_fair_market_values) %> (This page)
+                  </td>
                 <td></td>
               </tr>
               </tfoot>

spec/requests/purchases_requests_spec.rb

@@ -38,6 +38,49 @@
           expect(subject.body).to include("Purchase Comment")
         end
 
+        context "with multiple purchases" do
+          let!(:storage_location) { create(:storage_location, organization: organization) }
+          let(:vendor) { create(:vendor, organization: organization) }
+          let!(:purchase1) do
+            create(:purchase,
+              organization: organization,
+              storage_location: storage_location,
+              vendor: vendor,
+              amount_spent_in_cents: 1000,
+              line_items: [
+                build(:line_item, quantity: 10, item: create(:item, organization: organization))
+              ])
+          end
+
+          let!(:purchase2) do
+            create(:purchase,
+              organization: organization,
+              storage_location: storage_location,
+              vendor: vendor,
+              amount_spent_in_cents: 1000,
+              line_items: [
+                build(:line_item, quantity: 20, item: create(:item, organization: organization))
+              ])
+          end
+
+          before do
+            allow_any_instance_of(Purchase).to receive(:value_per_itemizable).and_return(1500)
+            get purchases_path(format: 'html')
+          end
+
+          it 'displays correct total purchase quantities' do
+            expect(response.body).to include("30")
+          end
+
+          it 'displays correct total purchase values' do
+            expect(response.body).to include("$20.00")
+          end
+
+          it 'displays correct total fair market values' do
+            expect(response.body).to include("$30.00")
+          end
+        end
+
         describe "pagination" do
           around do |ex|
             Kaminari.config.default_per_page = 2