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VisualizaçõesGet Key Value Given Other Key Value in FireBase
I am trying to find a way to find the value of the id given the email.
For example, If I had email2@gmail.com, It would give me the ID 108454568498950432898.
All emails are unique and there will be no repetition of emails.
This is my user tree:
Note: In the image it says email2 instead of email2@gmail.com. Ignore this
Here's my code so far: (Code won't run obviously but it's easier to enter code using the embed)
var users;
var givenEmail = "email2@gmail.com";
var neededID;
var dataRef = firebase.database().ref('users');
dataRef.on('value', (snapshot) => {
const data = snapshot.val();
users = data;
});
var usersArray = Object.keys(users);
for(i = 0; i < usersArray.length; i++) {
if(users[i].email == givenEmail) {
neededID = i;
break;
}
}2 Respostas
Responde à pergunta0
Well, I think you are almost there.
users[i].email
you can retrieve the email using this method, and similarly you can do it with id too
users[i].id
Please note that you wanted to find email2@gmail.com but your firebase only have email2
Maybe you would want to change that
0
I recommend using a query to perform the filtering on the server, instead of downloading the entire users node and filtering in your application code as you now do.
var givenEmail = "email2@gmail.com";
var dataRef = firebase.database().ref('users');
var query = dataRef.orderByChild('email').equalTo(givenEmail);
dataRef.once('value', (snapshot) => {
snapshot.forEach((userSnapshot) => {
console.log(userSnapshot.val().id);
});
});