How to make array by checking object property in firebase?

Question

I have a list of users in firebase database and I want to make an array of all users whose isDonor value is true. How can I accomplish that?

Frank van Puffelen · Accepted Answer · 2021-02-04 15:45:05Z

1

Something like this should work:

let ref = firebase.database().ref("users");
ref.orderByChild("isDonor").equalTo(true).once("value").then((results) => {
  results.forEach((snapshot) => {
    console.log(snapshot.key, snapshot.val());
  });
});

Also see the Firebase documentation on sorting and filtering data.

answered Feb 4, 2021 at 15:45

Frank van Puffelen

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4 Comments

Aqsa Maan Over a year ago

can u please breifly explan this?

Frank van Puffelen Over a year ago

After reading the document I linked, what isn't clear about the code I shared?

Aqsa Maan Over a year ago

the issue is I can't render data. I have created an array and pushing each obect is it. so array look like this in console

[{"isDonor": true, "name": "Nadi", "photo": "https://gre", "uid": "2ZE"}, {"email": "mmaz", "isDonor": true, "name": "Mz", "photo": "https://gra", "uid": "Cb"}]

but when i render it i get notthing on screen here is code {donorsData.map((v, i) => { return <Text key={i}>{v.name}</Text>; })}

Aqsa Maan Over a year ago

sorry about that. forgot to do it.

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