allow giving projects by identifier; don't render titles

lib/api/v3/queries/query_payload_representer.rb

@@ -60,7 +60,7 @@ module API
           end
         end
 
-        linked_property :project
+        linked_property :project, title_getter: ->(*) { nil }
 
         property :name
         property :filters,

lib/api/v3/queries/query_serialization.rb

@@ -128,8 +128,13 @@ module API
 
         def get_project_id(query_attributes)
           href = query_attributes.dig("_links", "project", "href")
+          id = id_from_href "projects", href
 
-          id_from_href "projects", href
+          if id.to_i != 0
+            id # return numerical ID
+          else
+            Project.where(identifier: id).pluck(:id).first # lookup Project by identifier
+          end
         end
 
         def get_sort_criteria(query_attributes)

spec/requests/api/v3/queries/create_form_api_spec.rb

@@ -157,10 +157,7 @@ describe "POST /api/v3/queries/form", type: :request do
     end
 
     it 'has the project set' do
-      project_link = {
-        "href" => "/api/v3/projects/#{project.id}",
-        "title" => project.name
-      }
+      project_link = { "href" => "/api/v3/projects/#{project.id}" }
 
       expect(form.dig("_embedded", "payload", "_links", "project")).to eq project_link
     end
@@ -209,6 +206,24 @@ describe "POST /api/v3/queries/form", type: :request do
       expect(form.dig("_embedded", "payload", "_links", "sortBy")).to eq sort_by
     end
 
+    context "with the project referred to by its identifier" do
+      let(:override_params) do
+        links = parameters[:_links]
+
+        links[:project] = {
+          href: "/api/v3/projects/#{project.id}"
+        }
+
+        { _links: links }
+      end
+
+      it "still finds the project" do
+        project_link = { "href" => "/api/v3/projects/#{project.id}" }
+
+        expect(form.dig("_embedded", "payload", "_links", "project")).to eq project_link
+      end
+    end
+
     context "with an unknown filter" do
       let(:override_params) do
         filter = parameters[:filters][0]