Add contact name to DFC Enterprise API

engines/dfc_provider/app/services/enterprise_builder.rb

@@ -23,6 +23,11 @@ class EnterpriseBuilder < DfcBuilder
       e.registerSemanticProperty("ofn:long_description") do
         enterprise.long_description
       end
+      e.registerSemanticProperty("ofn:contact_name") do
+        # This could be expressed as dfc-b:hasMainContact Person with name.
+        # But that would require a new endpoint for a single string.
+        enterprise.contact_name
+      end
       e.registerSemanticProperty("ofn:logo_url") do
         enterprise.logo.url
       end

engines/dfc_provider/spec/requests/enterprises_spec.rb

@@ -9,6 +9,7 @@ describe "Enterprises", type: :request, swagger_doc: "dfc.yaml", rswag_autodoc:
       :distributor_enterprise, :with_logo_image,
       id: 10_000, owner: user, abn: "123 456", name: "Fred's Farm",
       description: "This is an awesome enterprise",
+      contact_name: "Fred Farmer",
       facebook: "https://facebook.com/user",
       email_address: "hello@example.org",
       phone: "0404 444 000 200",

swagger/dfc.yaml

@@ -328,6 +328,7 @@ paths:
                       dfc-b:manages: http://test.host/api/dfc/enterprises/10000/catalog_items/10001
                       dfc-b:supplies: http://test.host/api/dfc/enterprises/10000/supplied_products/10001
                       ofn:long_description: "<p>Hello, world!</p><p>This is a paragraph.</p>"
+                      ofn:contact_name: Fred Farmer
                       ofn:logo_url: http://www.example.com/rails/active_storage/url/logo.png
                       dfc-b:affiliates: http://test.host/api/dfc/enterprise_groups/60000
                     - "@id": http://test.host/api/dfc/addresses/40000