Dialogue box Fetch from field

ERPNext Customize ERPNext
1 
    frm.add_custom_button(__('New Tasks'), function() {

        frappe.prompt([

            {'label': 'Assigned To', 'fieldname': 'assigned_to', 'fieldtype': 'Link', 'options': 'Employee'},
            {fieldtype: 'Column Break',},
            {'label': 'User ID','fieldname': 'user_id','fieldtype': 'Data','fetch_from': 'assigned_to.user_id','options':'User'},

        ], function(values){
            console.log('userr',values.user_id);

why this user_id not getting fetched

2

Hy @anjalipv

You need to see this post. I hope you find a solution

Thank You!