How can I access the child of a unique key in Firebase?-CodePudding

I am trying to access the child value of a unique key value (that had been "pushed") within Firebase. Currently, my database looks like this: enter image description here I want to access the value of "emailOfUser"

I am very new to Firebase so I am not familiar with the functions. Currently, this is my method of obtaining other values for a different section of the database: enter image description here

Thank you so much for any feedback!

I've tried different methods to accessing this data within the Firebase, but I cannot get it to work/the methods I were using were outdated. I also tried to "update" the Firebase instead of "pushing" the values to prevent a unique key from generating, but it simply overwrote my current data rather than appending something new.

CodePudding user response：

If you want to load all the users who voted and print their emails, you can do that with:

get(child(dbref, 'usersWhoVoted')).then((snapshot) => {
  snapshot.forEach((childSnapshot) => {
    console.log(childSnapshot.key, childSnapshot.val().emailOfUser);
  });
})

Note that your current structure allows a user to vote multiple times. If you want to only allow them to vote once, use some identifier of the user as the key in your database structure:

userVotes: {
  "uniqueIdOfUser1": "valueTheyVotedOn",
  "uniqueIdOfUser1": "valueTheyVotedOn",
  ...
}

Now each user can by definition only vote once, If they vote again (assuming your security rules allow that), their new vote will simply replace the existing vote.