你好!

所以我目前正在用react + firebase构建一个学生生产力应用程序，待办事项列表功能到目前为止还可以工作，但是，我希望每个用户的待办事项是唯一的，他们不只是给他们整个整个数据库的待办事项价值，我觉得这很棘手，因为没有't真的没有任何文档说明如何将用户添加到数据库中并将特定数据放到文档中的特定用户中，我的问题是我如何才能做到这一点

图形接口：https://github.com/yefim94/personalworkflow
代码：

import {useEffect} from "react"
import { collection, doc, setDoc, query, getDocs, onSnapshot, addDoc, orderBy, limit, Timestamp} from "firebase/firestore"; 
import {db} from "/Users/yefimblokh/Desktop/bigprojectbusiness/my-app/src/firebase-config"
import { auth } from '/Users/yefimblokh/Desktop/bigprojectbusiness/my-app/src/firebase-config';
import Button from '@mui/material/Button';
import Typography from '@mui/material/Typography';
import Modal from '@mui/material/Modal';
import Box from '@mui/material/Box';
const style = {
  position: 'absolute',
  top: '50%',
  borderRadius: "15px",
  left: '50%',
  transform: 'translate(-50%, -50%)',
  width: 400,
  bgcolor: 'background.paper',
  boxShadow: 24,
  p: 4,
};
const Projects = () => {
  const [todos, setTodos] = useState([])
  const [title, setTitle] = useState("")
  const [desc, setDesc] = useState("")
  const todosRef = collection(db, "todos");
  const {uid, photoURL, displayName} = auth.currentUser;
  async function getUID () {
    return uid;
  }
  useEffect(() => {
    const getData = async () => {
      const q = query(todosRef, orderBy("createdAt"))
      onSnapshot(q, (snapshot) => {
        let todos = []
        snapshot.forEach((doc) => {todos.push(doc.data())})
        setTodos(todos)
      })
    }
    getData()
  }, [])
  async function openModel () {
    handleOpen()
  }
  const [open, setOpen] = React.useState(false);
  const handleOpen = () => setOpen(true);
  const handleClose = () => setOpen(false);
  async function addTaskDatabase () {
     await addDoc(todosRef, {
      title: title,
      desc: desc,
      createdAt: Timestamp.fromDate(new Date()),
      uid: uid
    }) 
    setTitle("")
    setDesc("")
    handleClose()
  }
  return (
    <div style={{margin: "3em 3em 3em 3em"}}>
      <h1 style={{fontWeight: "600", position: "sticky", top: "50px", backgroundColor: "#fff"}}>Project</h1>
      <section style={{backgroundColor: "#F5FAF8", padding: "1em", borderRadius: "14px", overflow: "scroll"}}>
        <div style={{display: "flex", widtgh: "100%", justifyContent: "space-between", alignItems: "center"}}>
        <h3>To do</h3>
        <p style={{
          backgroundColor: "#E9F3F2",
          padding: "9px",
          borderRadius: "10px",
          color: "#71A399"
        }}>4</p>
        </div>
        <button style={{
          backgroundColor: "#E9F3F2",
          padding: "9px",
          borderRadius: "10px",
          color: "#71A399",
          border: "none",
          outline: "none",
          width: "100%",
          cursor: "pointer"
        }} onClick={openModel}>+</button>
              <Modal
        open={open}
        onClose={handleClose}
        aria-labelledby="modal-modal-title"
        aria-describedby="modal-modal-description"
      >
        <Box sx={style}>
          <h3>Add Task</h3>
          <Typography id="modal-modal-title" variant="h6" component="h2">
            Title: <input type="text" onChange={(e) => {setTitle(e.target.value)}} value={title} />
          </Typography>
          <Typography id="modal-modal-description" sx={{ mt: 2 }}>
           Description: <input type="text"  onChange={(e) => {setDesc(e.target.value)}} value={desc}/>
          </Typography>
          <button style={{
            backgroundColor: "red",
            border: "none",
            color: "#fff",
            padding: "10px"
            ,borderRadius: "5px 10px 5px 10px",
            marginTop: "1EM",
          }} onClick={addTaskDatabase}>Add</button>
        </Box>
      </Modal>
     {todos.map((doc, key, uid) => (
          <div key={key} style={{backgroundColor: "#fff", padding: "10px", borderRadius: "10px", marginTop: "1em"}}>
          <h3>{doc.title}</h3>
          <p>{doc.desc}</p>
        </div>
     ))}
      </section>
    </div>
  )
}

export default Projects```