realtime firebase database get property name and value on child_changed - reactjs

Question

I am working on real-time fire-base database.
i have a issue in getting value what is changed in fire-base.
i have client social database inside it posts and then kkkm(this is key) and then different properties and values and what i want is to toggle approval and rejected values like that approval:true but what i get is just true/false not the property name.
toggleCheck = (id) => {
var ref = firebase.database().ref('posts/'+id);
ref.off("child_changed");
var approval;
ref.on("child_changed", function (data) {
approval = data.val();
console.log("=============================");
console.log("The updated approval is " + approval);
});
}
toggleClose = (id) => {
var ref = firebase.database().ref('posts/'+id);
ref.off("child_changed");
var rejected;
ref.on("child_changed", function (data) {
rejected = data.val();
console.log(ref.getKey());
console.log(ref.getValue());
console.log("=============================");
console.log("The updated rejected is " + rejected);
});
}

Answer 1

I'm not 100% sure to understand what you want to do ("toggle approval and rejected values"?) but, based on the code in your question, the following is probably what you are looking for:
var ref = firebase.database().ref('posts/' + id);
ref.on('child_changed', function(data) {
console.log(data.key); // <-- Name of the field/node that was modified
console.log(data.val()); // <-- Value of the field/node that was modified
console.log("The updated" + data.key + " is " + data.val());
});
Explanations:
data is a DataSnapshot which has:
A key property, which is "the key (last part of the path) of the location of this DataSnapshot."
A val() method, which "extracts a JavaScript value from a DataSnapshot."
UPDATE FOLLOWING YOUR COMMENTS
I understand that you want to get both the values of the approval and rejected nodes (fields) when something changes in the post.
Therefore you should use the value event type instead of the child_changed one, as follows:
var ref = firebase.database().ref('posts/' + id);
ref.on('value', function(data) {
var approved = data.val().approved;
var rejected = data.val().rejected;
var object = {'approved': approved, 'rejected': rejected};
//Do whatever you want with the object
console.log(object);
});