Fix HEAD /posts with post_types param

lib/tentd/model/permissible_post.rb

@@ -156,7 +156,7 @@ def fetch_with_permissions(params, current_auth)
             end
 
             if params.post_types
-              params.post_types = params.post_types.split(',').map { |url| URI.unescape(url) }
+              params.post_types = parse_array_param(params.post_types)
               if params.post_types.any?
                 query << "AND #{table_name}.type_base IN ?"
                 query_bindings << params.post_types.map { |t| TentType.new(t).base }
@@ -201,6 +201,10 @@ def get_sort_column(params)
           end
         end
 
+        def parse_array_param(value)
+          (value.kind_of?(String) ? value.split(',') : value).map { |url| URI.unescape(url) }
+        end
+
         def mentions_relationship_foreign_key
           all_association_reflections.find { |a| a[:name] == :mentions }[:keys].first
         end

spec/integration/api/posts_spec.rb

@@ -74,6 +74,17 @@ def authorize!(*scopes)
       end
     end
 
+    context 'with post_types param' do
+      it 'should return count of posts' do
+        with_constants "TentD::API::PER_PAGE" => 1 do
+          params[:post_types] = ['type-uri-a', 'type-uri-b'].join(',')
+          head '/posts', params, env
+          expect(last_response.status).to eq(200)
+          expect(last_response.headers['Count']).to eql('0')
+        end
+      end
+    end
+
     context 'when read_posts scope authorized' do
       let(:authorized_post_types) { ['all'] }
       before { authorize!(:read_posts) }