CODEWITHSUNDEEP
javascriptreactjsfirebasefirebase-realtime-database
SimpleCoderJames
SimpleCoderJames

Reputation: 9

React Rendering a collection correctly

I am using react-firebase-hooks https://github.com/CSFrequency/react-firebase-hooks/tree/v4.0.2/database#full-example

Below is values return when I console.log(v.val()) and when I do console.log(v.val().name) it's undefined.

{
  1: { id: 1, name: "bob", status: "student" }
  2: { id: 2, name: "sam", status: "student" }
}

When I try to render above data. I get the error Objects are not valid as a React child. If you meant to render a collection of children use an array instead.

import { ref, getDatabase } from 'firebase/database';
import { useList } from 'react-firebase-hooks/database';

const database = getDatabase(firebaseApp);

const DatabaseList = () => {
  const [snapshots, loading, error] = useList(ref(database, 'list'));

  return (
    <div>
      <p>
        {error && <strong>Error: {error}</strong>}
        {loading && <span>List: Loading...</span>}
        {!loading && snapshots && (
          <React.Fragment>
            <span>
              List:{' '}
              {snapshots.map((v) => (
                <React.Fragment key={v.key}>{v.val()}, </React.Fragment>
              ))}
            </span>
          </React.Fragment>
        )}
      </p>
    </div>
  );
};

How do I render my data correctly?

Upvotes: 0

Views: 78

Answers (1)

Ahmed Tarek
Ahmed Tarek

Reputation: 518

That is because v.val() is an object of objects, and as you are interested in the name, you need to get the values of the first object and then map through it and hence access the name.

import { ref, getDatabase } from 'firebase/database';
import { useList } from 'react-firebase-hooks/database';

const database = getDatabase(firebaseApp);

const DatabaseList = () => {
  const [snapshots, loading, error] = useList(ref(database, 'list'));

  return (
    <div>
      <p>
        {error && <strong>Error: {error}</strong>}
        {loading && <span>List: Loading...</span>}
        {!loading && snapshots && (
            <span>
              List:{' '}
              {snapshots.map((v,i) => (
                Object.values(v.val()).map((obj,j) => 
                  <span key={i+j}>{obj.name}, </span>
                )
              ))}
            </span>
        )}
      </p>
    </div>
  );
};

Upvotes: 2

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