on save create child and then pass back to doctype

gistfile1.txt

        if (frm.doc.__islocal != 1) {
            var route = frappe.get_prev_route()
            if (route[1] == "User") {
				
    				var found = false
    				var userdoc = frappe.get_doc("User",route[2]);
    
    				for (i = 0;i<userdoc.user_emails.length;i++){
    					if (userdoc.user_emails[i].email_account==cur_frm.doc.name){
    						found = true
    					}
    				}
    				if (!found) {
    					var new_row = frappe.model.add_child(userdoc, "User Emails", "user_emails");
    
    					new_row.email_account = cur_frm.doc.name;
    					new_row.awaiting_password = cur_frm.doc.awaiting_password;
    					new_row.email_id = cur_frm.doc.email_id;
    
    					frappe.route_options = "unsaved"
    					frappe.set_route(route)
    				}
            }
        }