How to get id from clicked doc firebase react? - reactjs

Question

I am trying to get the id from a doc when I click a delete button. so the user can delete the post.
I got far enough to show the button if the user is the uploader.
but, I don't know how to get the id from the clicked document.
I tried this:
{auth.currentUser.uid === uploaderId ? (
<div
onClick={(e) => {
if (auth.currentUser.uid === uploaderId) {
e.stopPropagation();
deleteDoc(doc(db, "posts", id));
}
}}
>
<div>
<button>🗑️</button>
</div>
</div>
) : (
<div>
</div>
)}
but that doesn't work and gives me the error:
Uncaught TypeError: Cannot read properties of undefined (reading 'indexOf')
so to summarize how do I get the id from the document
full code:
import React, { useEffect, useRef, useState } from 'react';
import './App.css';
import { initializeApp } from "firebase/app";
import { getFirestore, collection, orderBy,
query, Timestamp, addDoc, limitToLast,
deleteDoc, doc, } from "firebase/firestore";
import { confirmPasswordReset, getAuth, GoogleAuthProvider, signInWithPopup, } from "firebase/auth";
import { useAuthState } from "react-firebase-hooks/auth";
import { useCollectionData } from "react-firebase-hooks/firestore";
// Initialize Firebase
const app = initializeApp(firebaseConfig);
const auth = getAuth(app);
const db = getFirestore(app);
function App() {
const [user] = useAuthState(auth);
return (
<div className="App">
<Header/>
{/* <Picker/> */}
<section>
<SignOut/>
{/* <ShowProfile/> */}
<Upload/>
{user ? <Feed /> : <SignIn />}
</section>
</div>
);
}
function Header() {
return (
<h1 className='headerTxt'>SHED</h1>
)
}
// function Picker() {
// }
function SignIn() {
const signInWithGoogle = () =>{
const provider = new GoogleAuthProvider();
signInWithPopup(auth, provider)
}
return (
<button className='SignIn' onClick={signInWithGoogle}>sign in with google</button>
)
}
function SignOut() {
return auth.currentUser && (
<button onClick={() => auth.signOut()}>Sign out</button>
)
}
function Feed() {
const postsRef = collection(db, 'posts');
const qwery = query(postsRef,orderBy('createdAt'), limitToLast(25), );
const [posts] = useCollectionData(qwery, {idField: "id"});
return (
<>
<main>
{posts && posts.map(msg => <Post key={msg.id} post={msg} />)}
</main>
</>
)
}
function Post(props) {
const {text, photoURL, displayName, uid, uploaderId, id} = props.post;
return (
<div className={"post"}>
<div className='msg'>
<div className='top'>
<img src={photoURL} alt="" />
<sub>{displayName}</sub>
</div>
<hr />
<p>{text}</p>
{auth.currentUser.uid === uploaderId ? (
<div
onClick={(e) => {
if (auth.currentUser.uid === uploaderId) {
e.stopPropagation();
deleteDoc(doc(db, "posts", id));
}
}}
>
<div>
<button>🗑️</button>
</div>
</div>
) : (
<div>
</div>
)}
{/* <button>❤️</button> */}
</div>
</div>
)
}
// function ShowProfile() {
// return(
// <div>
// <button onClick={queryMine}>my posts</button>
// </div>
// )
// }
function Upload() {
const postsRef = collection(db, 'posts');
const [formValue, setFormValue] = useState('');
const sendpost = async(e) =>{
e.preventDefault();
const {uid, photoURL, displayName} = auth.currentUser;
if (formValue !== "" && formValue !== " ") {
await addDoc(postsRef, {
text: formValue,
createdAt: Timestamp.now(),
displayName,
uploaderId: uid,
photoURL
})
setFormValue('')
}
}
return auth.currentUser &&(
<form onSubmit={sendpost}>
<textarea name="" id="" cols="30" rows="10"
value={formValue} onChange={(e) => setFormValue(e.target.value)}
></textarea>
<button type='submit'>➜</button>
</form>
)
}
export default App;```

Answer 1

Get the data (doc id and doc data) using querySnapshot and merge them into one object. Save an array of objects to a state and pass what you need as properties. For example:
...
const querySnapshot = await getDocs(collection(db, `users/${email}/todos`))
const todos = []
querySnapshot.forEach(doc => {
todos.push({
id: doc.id,
text: doc.data().text,
isCompleted: doc.data().isCompleted,
})
})
return todos
Here is a simple example of the Todo App, but the logic is the same. In the Todo component, I get the doc id as props. Full code:
import { collection, getDocs } from 'firebase/firestore'
import { useEffect, useState } from 'react'
import { db } from '../../app/firebase'
import Todo from '../Todo'
import './style.css'
const TodoList = () => {
const [todos, setTodos] = useState()
useEffect(() => {
const getData = async () => {
const querySnapshot = await getDocs(collection(db, 'users/kvv.prof#gmail.com/todos'))
const todos = []
querySnapshot.forEach(doc => {
todos.push({
id: doc.id,
text: doc.data().text,
isCompleted: doc.data().isCompleted,
})
})
return setTodos(todos)
}
getData()
}, [])
return (
<section className="todo-list">
{todos?.map(todo => (
<Todo key={todo.id} id={todo.id} text={todo.text} isCompleted={todo.isCompleted} />
))}
</section>
)
}
export default TodoList
If you use react-firebase-hooks, then you need to use this