code: function(model, req) {    
      if(!model) return {}
      
      var fields = {}
          ,queryFieldSet   
          
      if(req) {
          if(req.fieldSet) {
              queryFieldSet = {}
              try {
                  queryFieldSet = JSON.parse(req.fieldSet)
              } catch(e) {queryFieldSet = null}       
          } else if(req.urlparams && req.urlparams[1]) {
              queryFieldSet = {}
              var x = req.urlparams[1].split(',')
              for(var i=0;i<x.length;i++) queryFieldSet[x[i]] = 1    
          }
      }
  
      for(var i in model.fields) if(model.fields[i] && model.fields[i].visable) {
          if(!queryFieldSet || queryFieldSet[model.fields[i].name]) fields[model.fields[i].name] = 1
      }
      return fields;
  }
docs: Private get readable fields fom model