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function showAllPersons()
{
realm.write(()=>{
const persons = realm.objects("Person");
let ds = persons[0].dogs;
temp = [ds];
temp.push({name:"newDog", age:111, breed:"newDog"});
persons[0].dogs = temp;
let p = realm.objects("Person");
console.log(p[0].dogs[2].name)
});