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//remove() is equivalent to calling set(null)recentJobRef.child('id').remove();
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FirebaseDatabase.reference().child('recent').child('id').update({'title':'sadab is amazing' //yes I know.});
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//you can use "push" if you want an automated id, I'm giving my document id here.FirebaseDatabase.instance.reference().child('recent').child('id').set({'title': 'Realtime db rocks','created_at': time});