Sailsjs find（）回调操作

Question

i have a problem with my callbacks, i dont know how i get it back.

index: function(req, res,next) {
    User.find().exec(function(err,users) {
        if(err) {
         //do something
        }
        res.locals.users = users
        return true;
    });

   Country.find().exec(function(err,countrys) {
    //save country
   }

  console.log(res.locals.users)
  res.view({
     users: res.locals.users,
     country: countrys
     user:res.locals.user
  });
}

How can i get access to both objects?

Thank you

Answer 1

Your DB calls are running async , that means the view is rendered before the data can be passed to them. So you have to make them in synchronous manner. This can be achived via callback or you can chain your functions instead of callbacks, like this,

index: function(req, res,next) {
   User.find().exec(function(err,users) {
    if(err) {
     //do something
    }
    else{
      res.locals.users = users
      Country.find().exec(function(err,countrys) {
       if(err) {
           //do something
       }
       else{
           console.log(res.locals.users)
           res.view({
             users: res.locals.users,
             country: countrys
             user:res.locals.user
           });
       }
      }
    }
  });
}

Other way is to use callbacks.

Answer 2

If your trying to make it pretty and organised when you keep adding more queries you can use the async library that comes with sails

see this answer as an example

Chaining waterline calls with Promises