Rails 4: Trying to use Ancestry with jstree - json

Question

I am new to Rails and trying to populate a jstree in the browser with JSON from the Ancestry gem (see https://github.com/stefankroes/ancestry). JSON is the go-between. Where I am stuck is translating the JSON produced (from my Tree model) by Ancestry:
<%= #trees.arrange_serializable.to_json %>
That gives me nice JSON as follows (fragment only, apologies for the nonsense values):
[
{
"id": 2,
"name": "Milk",
"note": "No details available",
"created_at": "2014-09-20T13:22:03.262Z",
"updated_at": "2014-09-20T13:48:46.301Z",
"value": "3.06",
"ancestry": null,
"children": [
{
"id": 1,
"name": "Farms",
"note": "Some note here",
"created_at": "2014-09-20T13:05:22.186Z",
"updated_at": "2014-10-03T11:30:39.029Z",
"value": "432.0",
"ancestry": "2",
"children": [
{
"id": 8,
"name": "Zog",
"note": "Orc",
"created_at": "2014-09-27T22:11:20.874Z",
"updated_at": "2014-10-03T11:30:38.989Z",
"value": "11.0",
"ancestry": "2/1",
"children": [
{
"id": 14,
"name": "Planes",
"note": "",
"created_at": "2014-10-04T01:01:12.890Z",
"updated_at": "2014-10-04T04:51:20.873Z",
"value": "422.0",
"ancestry": "2/1/8",
"children": []
}
]
},
but the jstree plugin requires a particular format for the JSON as follows (from http://www.jstree.com/docs/json/):
{
id : "string" // will be autogenerated if omitted
text : "string" // node text
icon : "string" // string for custom
state : {
opened : boolean // is the node open
disabled : boolean // is the node disabled
selected : boolean // is the node selected
},
children : [] // array of strings or objects
li_attr : {} // attributes for the generated LI node
a_attr : {} // attributes for the generated A node
}
While the source hierarchical structure is perfect, I need to replace the attribute "name" in the original with "text" in the output, plus a few other changes.
At the back of my mind I feel there should be something elegant (like XSLT for XML) to translate JSON#1 into JSON#2 but I can't find any examples that do this.