return publishing app on HostContentItems

Now that this PR is merged [1] we should be able to retrieve the name of
the publishing app for Host Content. We will shortly use this when
creating Publish Intents to remove the cache when updating Host Documents.

[1] alphagov/publishing-api#2876

lib/engines/content_object_store/app/models/content_object_store/host_content_item.rb

@@ -1,4 +1,4 @@
 module ContentObjectStore
-  class HostContentItem < Data.define(:title, :base_path, :document_type, :publishing_organisation)
+  class HostContentItem < Data.define(:title, :base_path, :document_type, :publishing_organisation, :publishing_app)
   end
 end

lib/engines/content_object_store/app/services/content_object_store/get_host_content_items.rb

@@ -21,6 +21,7 @@ def items
           base_path: item["base_path"],
           document_type: item["document_type"],
           publishing_organisation: item["primary_publishing_organisation"],
+          publishing_app: item["publishing_app"],
         )
       end
     end

lib/engines/content_object_store/test/components/content_block/document/show/host_editions_table_component_test.rb

@@ -12,6 +12,7 @@ class ContentObjectStore::ContentBlock::Document::Show::HostEditionsTableCompone
         "title" => "Some title",
         "base_path" => "/foo",
         "document_type" => "document_type",
+        "publishing_app" => "publisher",
         "publishing_organisation" => {
           "content_id" => SecureRandom.uuid,
           "title" => "bar",

lib/engines/content_object_store/test/unit/app/services/get_host_content_items_test.rb

@@ -16,6 +16,7 @@ class ContentObjectStore::GetHostContentItemsTest < ActiveSupport::TestCase
           "title" => "foo",
           "base_path" => "/foo",
           "document_type" => "something",
+          "publishing_app" => "publisher",
           "primary_publishing_organisation" => {
             "content_id" => SecureRandom.uuid,
             "title" => "bar",
@@ -63,6 +64,7 @@ class ContentObjectStore::GetHostContentItemsTest < ActiveSupport::TestCase
       assert_equal result[0].title, response_body["results"][0]["title"]
       assert_equal result[0].base_path, response_body["results"][0]["base_path"]
       assert_equal result[0].document_type, response_body["results"][0]["document_type"]
+      assert_equal result[0].publishing_app, response_body["results"][0]["publishing_app"]
       assert_equal result[0].publishing_organisation, expected_publishing_organisation
     end