angularjs: chain promises returns a promise instead of an object

Question

I have a chain promises and I want to return an object instead of a promise. Instead I get a promise. This is the function:

self.get = function(id) {
    var parameters = [id];
    var orders     = {}
    return DBA.queryAgent("SELECT * FROM Orders WHERE " + column_id + " = ?", parameters).then(function(result) {
        return DBA.getById(result);
    }).then(function(result) {
        order = result;
        return self.getProdutcs(id);
    }).then(function(result) {
        order.Products = result;
        return order;
    });
}

I expect that

service.get(1)

returns an object, I get a promise. Where am I wrong?

Thank you

Abdul Rehman Sayed · Accepted Answer · 2016-10-21 13:54:56Z

2

From the angular docs https://docs.angularjs.org/api/ng/service/$q

calling the then method of a promise returns a new derived promise,

It is the way angular is written. Hence, you have to access it like this.

 service.get.then(function(result) {
    // whatever
  });

answered Oct 21, 2016 at 13:54

Abdul Rehman Sayed

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1 Comment

Giacomo M Over a year ago

I got it, thanks. I had forgotten the asyncronous fact.

Dave Cooper · Accepted Answer · 2016-10-21 13:14:10Z

1

You can access the value by doing the following:

  service.get.then(function(result) {
    console.log(result);   
  });

answered Oct 21, 2016 at 13:14

Dave Cooper

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7 Comments

Giacomo M Over a year ago

I know I can do that, but I want understand how I can NOT do that.

Dave Cooper Over a year ago

The then() function returns a promise. It's how they work. developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…

charliebeckwith Over a year ago

If you don't want it to return a promise then you can run run the command synchronously and block the thread or pass a callback function to the get method and invoke that instead of using an anonymous function. The point of promises is to do neither of those things

Giacomo M Over a year ago

Thanks to both, you are right. I was forgetting the asynchronous fact

Dave Cooper Over a year ago

Not sure why my answer didn't get marked as the selected answer or get an upvote :( It contained all the necessary information.

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