Grails duplicating json on query - json

Question

I'm learning grails with json and I encountered this problem, which my JSON duplicate 4x in the same object and should be each, not all together:
[{"id":[2,1,4,3],"address":"[test.web.Address : 2, test.web.Address : 1, test.web.Address : 4, test.web.Address : 3]","range":[300,200,500,400],"placetype":"[Dangerous, Dangerous, Dangerous, Dangerous]"},{"id":[2,1,4,3],"address":"[test.web.Address : 2, test.web.Address : 1, test.web.Address : 4, test.web.Address : 3]","range":[300,200,500,400],"placetype":"[Dangerous, Dangerous, Dangerous, Dangerous]"},{"id":[2,1,4,3],"address":"[test.web.Address : 2, test.web.Address : 1, test.web.Address : 4, test.web.Address : 3]","range":[300,200,500,400],"placetype":"[Dangerous, Dangerous, Dangerous, Dangerous]"},{"id":[2,1,4,3],"address":"[test.web.Address : 2, test.web.Address : 1, test.web.Address : 4, test.web.Address : 3]","range":[300,200,500,400],"placetype":"[Dangerous, Dangerous, Dangerous, Dangerous]"}]
My domain Address:
Long id
String street
String city
Long zip;
int number
My domain Place:
Long id
Long range
PlaceType type
Address address
My Controller:
def avoid() {
def result = [];
def r = []
def a = Place.executeQuery("select distinct a from Place a where a.type = 1")
for (int i = 0; i < a.size(); i++) {
println(result)
result.add(a)
}
if (result) {
result.each() { place ->
r << [id: place.id,
address: place.address.street.toString(),
range: place.range,
placetype: place.type.toString()
];
}
} else {
println('error')
}
return jsonRender("JSON", params.callback, r)
}
PlaceType enum
enum PlaceType {
DANGEROUS('Dangerous', 1),
NOT_DANGEROUS('Not Dangerous', 2)
private final int id;
private final String description;
public PlaceType(String description, int id) {
this.description = description
this.id = id
}
public static PlaceType getById(int id) {
switch (id) {
case 1:
return DANGEROUS
case 2:
return NOT_DANGEROUS
}
}
#Override
public String toString() {
description
}
public short getId() {
id
}
}
Where I'm doing wrong? edit: test.web.Address now show the real address

Answer 1

there is a lot of "noise" in your groovy code...
I'd put it like that:
def avoid(){
render Place.findAllByType( PlaceType.Dangerous ).collect{ Place place ->
[id: place.id,
address: place.address.street.toString(),
range: place.range,
placetype: place.type.toString()
]
} as JSON
}
In this case you have a couple of possible error sources fewer.
Also I think, that stuff like place.type.toString() is wrong. The object shall be JSON-ified directly and the output should be a JSON-object rather that default toString() implementation

Answer 2

I don't know the method
jsonRender ("JSON", params.callback, r)
Please try this:
render r as JSON
and don't forget the import:
import grails.converters.*
see doc for render method: http://grails.org/doc/latest/ref/Controllers/render.html
or try to use the new response method: http://grails.org/doc/latest/ref/Controllers/respond.html