Import data into MongoDB - Bug with tMongoDBOutput, tExtractJSONFields

[Anonymous]

Dear friends, 
I have a problem when trying to import data from flat file into MongoDB using tMongoDBOutput, tExtractJSONFields and tWriteJSONFields, describing in the scenario as below: 
Ref: internet, you can search by writing some words in data set of my example, sorry I cannot attach an URL. 
Here is a simple example of how to read a CSV file and convert the data into JSON format.
CSV data (original data):
WDCi,Lean,KL
WDCi,Kai Herng,KL
WDCi,Walter,Sydney
WDCi,Deborah,Sydney
WDCi,Terry,US
FPT,Minh-Hieu,Hanoi
FPT,Anthony,Paris
FPT,Luis,Paris
JSON data (result wanted) in Mongo:

{
    "_id" : ObjectId("554b7fdcb42309e07933f70f"),
    "name" : "WDCi",
    "locations" : 
            }, 
            {
                "location" : "Sydney",
                "staffs" : 
            }, 
            {
                "location" : "US",
                "staffs" : {
                    "staff" : "Terry"
                }
            }
        ]
    }
{
    "_id" : ObjectId("554b7fdcb42309e07933f710"),
    "name" : "FPT",
    "locations" : 
            }
        ]
    }

Firstly, I will use a tFileInputDelimited component to read the CSV file: 
http://blog.wdcigroup.net/wp-content/uploads/2012/07/fileschema.pngFigure 1.1
Then, I will drop the tWriteJSONField component from the palette and link the output row of the tFileInputDelimited component to it. After that, I define the schema for tWriteJSONField component. In this scenario, I create one column named “company” and set it as the output column of the component. The output row of tWriteJSONField component is linked to a tExtractJSONFields component so that I can use to insert into MongoDB later.

The result when I see in MongoDB is: 

{
    "_id" : ObjectId("554b7fdcb42309e07933f70f"),
    "name" : "WDCi",
    "locations" : {
        "locations" : 
            }, 
            {
                "location" : "Sydney",
                "staffs" : 
            }, 
            {
                "location" : "US",
                "staffs" : {
                    "staff" : "Terry"
                }
            }
        ]
    }
}
/* 2 */
{
    "_id" : ObjectId("554b7fdcb42309e07933f710"),
    "name" : "FPT",
    "locations" : {
        "locations" : 
            }
        ]
    }
}

The problem is: the array of location embedded document is included inside an "locations" element. How could I do to have the result as wanted?
Thanks very much.  
p/s: I tried to uncheck the "Get nodes" box of location in tExtractJSONFields, but the result in MongoDB showed: 
{
    "_id" : ObjectId("554b7ba4b42394748949a3e3"),
    "name" : "WDCi",
    "locations" : ""
}
{
    "_id" : ObjectId("554b7ba4b42394748949a3e4"),
    "name" : "FPT",
    "locations" : ""
}

[Anonymous]

Hi 
You are able to generate directly desired result with tMongodbOutput, about the configuration of XML tree on tMongodbOutput, please see the following screenshots.
BRS
Shong

[Anonymous]

Dear Friends,
How to prevent the creation of empty value key in tmongodbOutput component.