introduce project representer for rendering

modules/bcf/app/controllers/bcf/api/v2_1/projects_api.rb

@@ -37,10 +37,8 @@ module Bcf::API::V2_1
         end
 
         get do
-          {
-            project_id: @project.id,
-            name: @project.name
-          }
+          Bcf::API::V2_1::Projects::SingleRepresenter
+            .new(@project)
         end
       end
     end

modules/bcf/app/representers/bcf/api/v2_1/projects/single_representer.rb

@@ -0,0 +1,40 @@
+#-- encoding: UTF-8
+
+#-- copyright
+# OpenProject is a project management system.
+# Copyright (C) 2012-2018 the OpenProject Foundation (OPF)
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2017 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See docs/COPYRIGHT.rdoc for more details.
+#++
+
+module Bcf::API::V2_1
+  class Projects::SingleRepresenter < Roar::Decorator
+    include Representable::JSON
+
+    property :id,
+             as: :project_id
+
+    property :name
+  end
+end

modules/bcf/spec/representers/bcf/api/v2_1/projects/single_representer_rendering_spec.rb

@@ -0,0 +1,62 @@
+#-- copyright
+# OpenProject is a project management system.
+# Copyright (C) 2012-2019 the OpenProject Foundation (OPF)
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2017 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See docs/COPYRIGHT.rdoc for more details.
+#++
+
+require 'spec_helper'
+
+describe Bcf::API::V2_1::Projects::SingleRepresenter, 'rendering' do
+  let(:project) { FactoryBot.build_stubbed(:project) }
+  let(:user) { FactoryBot.build_stubbed(:project) }
+
+  let(:instance) { described_class.new(project) }
+
+  subject { instance.to_json }
+
+  shared_examples_for 'attribute' do
+    it 'reflects the project' do
+      expect(subject)
+        .to be_json_eql(value.to_json)
+        .at_path(path)
+    end
+  end
+
+  describe 'attributes' do
+    context 'project_id' do
+      it_behaves_like 'attribute' do
+        let(:value) { project.id }
+        let(:path) { 'project_id' }
+      end
+    end
+
+    context 'name' do
+      it_behaves_like 'attribute' do
+        let(:value) { project.name }
+        let(:path) { 'name' }
+      end
+    end
+  end
+end