Groovy JsonBuilder, array inside an array

Question

I need to build the following json using groovy's JsonBuilder().

[
  {
    "date": "2017-12-08",
    "dog": [
        {
            "name": "Joe",
            "age": "1"
        },
        {
            "name": "Bro",
            "age": "2"
        },
        {
            "name": "Doe",
            "age": "3"
        }       
    ] 
}
]

I cant get the array in the array, because of the date, it wants to always to put date not in the same level as dog array, but put it in { }, like:

[{
    {
    "date": "2017-12-08",
    },
    "dog": [
        {
            "name": "Joe",
            "age": "1"
        },
        {
            "name": "Bro",
            "age": "2"
        },
        {
            "name": "Doe",
            "age": "3"
        }       
    ] 
}
]

tim_yates · Accepted Answer · 2017-12-08 11:39:34Z

2

Just stick the date alongside your list in the model:

import groovy.json.JsonBuilder
import groovy.transform.Canonical

@Canonical
class Dog {
    int age
    String name
}

@Canonical
class DogList {
    String date
    List<Dog> dog
}

def ark = [
    new DogList('2017-12-08', [
        new Dog(1, 'Joe'),
        new Dog(2, 'Bro'),
        new Dog(3, 'Doe')
    ])
]

def json = new JsonBuilder(ark).toPrettyString()
println json

prints:

[
    {
        "date": "2017-12-08",
        "dog": [
            {
                "age": 1,
                "name": "Joe"
            },
            {
                "age": 2,
                "name": "Bro"
            },
            {
                "age": 3,
                "name": "Doe"
            }
        ]
    }
]

answered Dec 8, 2017 at 11:39

tim_yates

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1 Comment

Edo-san Over a year ago

Thanks, this works just like I needed. I was getting similar result to yours also, but I was having a unnecessary additional array wrapped around all of it when I used .collect().

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