Redmine

I have problem writing plugin which overrides REST API view. I wrote new api.rsb file and put it in my plugin folder with respect to the original path. Redmine was expected to load and use overridden API view, but it continued to load the old one.

My plugin folder structure:

plugins\custom_api\app\views\users\show.api.rsb
plugins\custom_api\init.rb

My `init.rb`:

require 'redmine'

Redmine::Plugin.register :redmine_custom_api_plugin do
  name 'Custom API Plugin'
  author 'Name'
  description 'Description'
  version '0.1'
end

Environment:

Environment:
  Redmine version                          2.3.1.stable
  Ruby version                             1.9.3 (i386-mingw32)
  Rails version                            3.2.13
  Environment                              production
  Database adapter                         Mysql2
Redmine plugins:
  redmine_custom_api_plugin                0.1

What am I doing wrong? How to override Redmine API without patching original sources?