Question

As input I have list of all objects where each object has properties:

• name
• children(object.children is the list of all children)
• parent(null if object is top level)

How correctly to use Groovy JSONBuilder to render such data(depth of tree is unlimited):

-Object 1
--Object 1.1
---Object 1.1.1
--Object 1.2
-Object 2

in JSON format it should be something like this:

[
    {
        "name":"Object1",
        "children":[
            {
                "name":"Object1.1",
                "children":[
                    {
                        "name":"Object 1.1.1",
                        "children":[]
                    }
                ]
            },
            {
                "name":"Object1.2",
                "children":[]
            }
        ]
    },
    {
        "name":"Object2","children":[]
    }
]

This is needed to build JSON for extJS component which will display this tree. Thanks for your help!

Answer 1

Add this property to your Config.groovy file:

grails.converters.json.default.deep=true

The Grails Doc
is a little out of date but the relevant property is listed there under ‘Configuration Options’