Adding Additional Attributes to a ResponseBody Object

Question

I have the following Spring @RestController method

@RequestMapping(value = "/getPeople", method = RequestMethod.GET)
public List<Person> getPeople(Model model){
    List<People> people = personRepo.getAllPeople();
    model.addAttribute("people", people);
    return people;
}

Which returns the following to the Response Body

[
    {"name":"Jim","group":1},
    {"name":"Dwight","group":2},
    {"name":"Stanley","group":3}
]

Can I modify this method (via the @Controller method itself, or with an AJAX request) to include additional attributes, both inside or outside of the people array, and without modifying the Person object - so that the object returned could look something like

{
    "people":[
        {"name":"Jim","group":1, "independentAttribute": "A"},
        {"name":"Dwight","group":2, "independentAttribute": "B"},
        {"name":"Stanley","group":3, "independentAttribute": "C"}
    ],
    "extraAttributes":[
        {"attribute1": 1,"attribute2": 2,"attribute3":3}
    ]
}

apologies if this isn't valid object/array syntax, lackadaisically threw it together.

My mistake, it's a @RestController that returns the array to the Response Body - updated my question. Does that help? — Clay Banks
– Clay Banks, Commented Oct 12, 2015 at 21:29
Revised the ? again, I get the json object via an AJAX call using d3.json call (github.com/mbostock/d3/wiki/Requests#d3_json) - perhaps the object can be modified via an AJAX callback? — Clay Banks
– Clay Banks, Commented Oct 12, 2015 at 21:47

Bnrdo · Accepted Answer · 2015-10-13 03:46:32Z

2

You can modify the object in the callback of the JSON request. I'm not familiar with d3_json but you can do something like

callback : function(data){
   //data is the returned List<Person> serialized to JSON
   var modifiedObj = new Object();
   modifiedObj.persons = data;
   modifiedObj.extraAttributes = [{"attribute1": 1,"attribute2": 2,"attribute3":3}]
}

answered Oct 13, 2015 at 3:46

Bnrdo

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1 Comment

Clay Banks Over a year ago

Just what I was looking for. Thank you

Szilárd Németh · Accepted Answer · 2015-10-12 21:44:50Z

0

I think you are looking for a custom JSON serializer, see this link: http://www.baeldung.com/jackson-custom-serialization

answered Oct 12, 2015 at 21:44

Szilárd Németh

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4 Comments

Szilárd Németh Over a year ago

Sorry, I don't get why you -1ed, did I misunderstand something? I thought you would like to add custom json string to the already serialized json (list of people)? Am I right?

Clay Banks Over a year ago

I didn't downvote you m8. I found the answer helpful, although I've found @onepotato had what I was looking for

Sotirios Delimanolis Over a year ago

How would they use this JSON serializer?

Szilárd Németh Over a year ago

Oh I see now, onepotato's solution is great, no probs :)

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