Forgot to add file.

app/controllers/api/experimental/concerns/grape_routing.rb

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+#-- copyright
+# OpenProject is a project management system.
+# Copyright (C) 2012-2014 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) 2006-2013 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 doc/COPYRIGHT.rdoc for more details.
+#++
+
+module Api::Experimental::Concerns::GrapeRouting
+  def query_route_from_grape(route, query)
+    # this probably forces grape to be loaded.  at least it is necessary in
+    # development mode because the routes otherwise are not within the
+    # "api/:version" namespace.
+    API::Root
+    query_route = API::V3::Queries::QueriesAPI.routes.detect { |r| r.route_path.match(Regexp.new("\/#{route}")) }
+
+    query_route.route_path.gsub(":version", query_route.route_version)
+                          .gsub(":id", query.id.to_s)
+                          .gsub(/\(\.:format\)/,'')
+  end
+end