Internal Requests in Rails (coderwall.com)

def internal_request(path, params={})
  request_env = Rack::MockRequest.env_for(path, params: params.to_query).merge({
    'rack.session' => session  # remove if session is unavailable/undesired in request
  })

  # Returns: [ status, headers, body ]
  Rails.application.routes.call(request_env)
end