code: function(req, res, next){
        var subdomain = req.body.subdomain;
  
        if (!subdomain) {
          return res.json(400, 'Company subdomain is mandatory!');
        }
  
        AccountService
          .find({
            where: {
              subdomain: subdomain
            }
          })
          .then(function(result){
            if(result.length){
              return res.json(403, 'This URL "' + subdomain + '" is already taken');
            }
            next();
          })
          .catch(function(err){
            return res.json(500, 'There was an error: ' + err);
          });
      }
docs: Middleware helper function for requiring a unique subDomain for a given POST request
  
  @param  {Request}  req  The Request Object
  @param  {Response} res  The response object
  @param  {Function} next Continue past this middleware
  @return {void}