How can I get uuid of prefab from the node created with prefab?

Cocos Creator
#1

Hi friends.
I need to get prefab uuid from node’s PrefabInfo object. I need to save this uuid and I want to use it later to instantiate objects from prefabs. I can get correct uuid from prefab object itself but can’t get it from the node created.

Let me explain.

I can get uuid and path infor of prefab from editor:

menu

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And I can use it in script like this:

var self = this;

let uuid = "2877e0c4-6500-41d8-9698-71d928778555";

cc.AssetLibrary.loadAsset(uuid, function (err, asset) {
    
    if(err){
        cc.log("ERROR: " + err);
        return;
    }

    let spawn_object = cc.instantiate(asset);

    spawn_object.parent = self.node.parent;
    spawn_object.x = self.node.x;
    spawn_object.y = self.node.y;
    
});

So far so good.
I drag the prefab to scene view and create node.

Now I need to find this node’s prefab with code.

I’ve tried get info from “node._prefab” but it only includes this information in PrefabInfo:

_prefab: cc_PrefabInfo:{
    asset: null
    fileId: "19LYOm+BVNJalMEZnNVgeb"
    root: cc_Node {_name: "Crystal_…}
    sync: false
}

I’ve tried “fileId” as uuid but it doesn’t work.
I need to find uuid of original prefab in asset database.

Any advices from big brothers?