Global redirect

application_controller.rb

def ensure_clinician_is_logged_in
  respond_to do |format|
    format.html { redirect_to "/clinicians/sign_in#{build_url_query}" unless current_clinician }
    format.json do
      response.headers['REQUIRES_AUTH'] = '1'
      render js: "/clinicians/sign_in#{build_json_query}" unless current_clinician
    end
  end
end

filters.js

export const handleLoginRedirect = (response) => {
  if (typeof response.getResponseHeader === 'function' &&
      response.getResponseHeader('REQUIRES_AUTH') === '1') {
    window.location = response.responseText;
  }
};

messages.js

import { handleLoginRedirect } from 'util/filters';

export function postMessageAttachment(data, doneCb, errCb) {
  return function(dispatch) {
    return $(data.form).ajaxSubmit({
      dataType: 'json',
      url: Routes.clinician_app_messages_path({
        ...dataWithoutForm
      }),
      type: 'POST',
      success(response) {
        ...
      },
      error(response) {
        handleLoginRedirect(response);
        if (errCb) errCb(response);
      }
    });
  };
}