How do i modify a raw data object returned by an ExtJS AJAX proxy into a JSON object to be consumed by a Tree Store - extjs

Question

In an effort to create a treepanel, i configure it with a treestore whose AJAX proxy url receives json data i have no control of. But using Ext.data.reader.Json's transform property invokable before readRecords executes, gives an option to modify the passed raw (deserialized) data object from the AJAX proxy into a modified or a completely new data object. The transform config, gives the code snippet below:
Ext.create('Ext.data.Store', {
model: 'User',
proxy: {
type: 'ajax',
url : 'users.json',
reader: {
type: 'json',
transform: {
fn: function(data) {
// do some manipulation of the raw data object
return data;
},
scope: this
}
}
},
});
I would please like an example on how to go about modifying the return JSON object
[
{
"id": 3,
"attributes":
{},
"name": "user_one",
"login": "",
"email": "user_one#ats",
"phone": "0751223344",
"readonly": false,
"administrator": false,
"password": null
},
{
"id": 4,
"attributes":
{},
"name": "user_two",
"login": "",
"email": "user_two#ats",
"phone": "0751556677",
"readonly": false,
"administrator": false,
"password": null
}
]
into a JSON object fit for a treestore.
The hierarchical tree is to be rendered to show which user is under which admin using a condition administrator==true from the returned JSON, then a second AJAX request that returns that admin's users shown here.
[
{
"user_id": 3,
"admin_id": 1,
},
{
"user_id": 4,
"admin_id": 2,
}
]

Answer 1

Is the data nested at all? Otherwise why use a treepanel instead of a grid? To your question though, it'll depend on how you configure your treepanel but it would probably be something like this:
transform: {
fn: function(data) {
var treeRecords = Ext.Array.map(data, function(i){
return {
text: i.name,
leaf: true
//any other properties you want
}
});
var treeData = {
root: {
expanded: true,
children: treeRecords
}
};
return treeData;
},
scope: this
}