Question

New to Mongodb,trying to get _id after mongodb insert without a round trip.

$.ajax( { url: "https://api.mongolab.com/api/1/databases/xxx/collections/xx?apiKey=xxx",
          data: JSON.stringify( [ { "x" : 2,"c1" : 34,"c2" : getUrlVars()["c2"]} ] ),
          type: "POST",
          contentType: "application/json" } );

Thanks

edit: Solved buy removing square bracers JSON.stringify( { "x" : 2,"c1" : 34,"c2" : getUrlVars()["c2"]} )

Answer 1

You can’t get the _id of the object without waiting for a response because the _id is generated on the server. You need to attach a success call to your request. The id is actually returned as a $oid member within an _id object.

This is assuming you are using $.ajax to make the request and the MongoLab REST API as documented at http://support.mongolab.com/entries/20433053-rest-api-for-mongodb

For example:

$.ajax( { url: 'https://api.mongolab.com/api/1/databases/xxx/collections/xx?apiKey=xxx',
          data: JSON.stringify( {"x" : 1 } ),
          type: "POST",
          contentType: "application/json"}
      ).success(function(returnedData) {
          alert(returnedData._id["$oid"]);
      });