If 语句内部映射

Question

我目前有一个 DataGrid，它正在呈现从我的后端 mongoDB 抓取的数据。数据呈现映射到 mongoDB 文档中对象指定的键。在每个文档中都有一组布尔值，我正在尝试检查其中是否有任何一个是真的，如果它们是真的，它将在每一行的 repairsNeeded 列中呈现一个 Y，如果不是，它将呈现一个 N。我运行遇到的主要问题是 where/how 检查这个。我玩过一些不同的想法都无济于事。现在，我将每一行的 repairsNeeded 列分配给 document.isPowerCordDamaged（我的一个布尔值），它根据是否选中来呈现 true 或 false。

代码：

function Rounding() {
  const [cartsRounded, setCartsRounded] = useState([]);

  let navigate = useNavigate();

  useEffect(() => {
    userCartsRounded()
      .then((response) => {
        setCartsRounded(response.data);
      })
      .catch((err) => {
        console.log(err);
      });
  }, []);

  const columns = [
    {
      field: "serialNum",
      headerName: "Cart Serial Number",
      width: 250,
    },
    {
      field: "pcNum",
      headerName: "Workstation Number",
      width: 250,
    },
    {
      field: "dateLastRounded",
      headerName: "Last Rounded On",
      width: 250,
    },
    {
      field: "repairsNeeded",
      headerName: "Repairs?",
      width: 100,
    },
    {
      field: "quarter",
      headerName: "Quarter",
      width: 75,
    },
  ];

  const [sortModel, setSortModel] = React.useState([
    {
      field: "dateLastRounded",
      sort: "desc",
    },
  ]);

  const rows = useMemo(
    () =>
      cartsRounded.map((row, index) => ({
        ...row,
        id: index,
        serialNum: row.cartSerialNumber,
        pcNum: row.pcNumber,
        dateLastRounded: moment(row.updatedAt).format("MM-D-YYYY"),
        repairsNeeded: row.isPowerCordDamaged,
        quarter: moment(row.updatedAt).format("Qo"),
      })),
    [cartsRounded]
  );

  return (
    <div>
      <IconButton
        color="primary"
        aria-label="new rounding"
        component="span"
        onClick={() => {
          navigate("add_new_cart");
        }}
      >
        <AddCircleOutline />
      </IconButton>
      <div style={{ height: 400, width: "100%" }}>
        <DataGrid
          component={Paper}
          rows={rows}
          columns={columns}
          sortModel={sortModel}
          pageSize={100}
          rowsPerPageOptions={[100]}
        />
      </div>
    </div>
  );
}

export default Rounding;

文档示例：

  {
    _id: new ObjectId("61b95e447aec51d938e856cc"),
    cartSerialNumber: 'testytitit',
    pcNumber: '14124f0sdf0sfs',
    isPowerCordDamaged: false,
    isFuseBlown: false,
    isInverterBad: false,
    isInterfaceDamaged: false,
    isPhysicalDamage: false,
    otherNotes: '',
    roundedBy: '6186c13beb18d33d5088f7b2',
    createdAt: 2021-12-15T03:17:24.495Z,
    updatedAt: 2021-12-15T03:17:24.495Z,
    __v: 0
  }

Answer 1

我可能没有理解这里的问题。但我认为您要做的是让 repairsNeeded 字段具有 Y 或 N 而不是其布尔值。

试试这个。

const rows = useMemo(
    () =>
      cartsRounded.map((row, index) => ({
        ...row,
        id: index,
        serialNum: row.cartSerialNumber,
        pcNum: row.pcNumber,
        dateLastRounded: moment(row.updatedAt).format("MM-D-YYYY"),
        repairsNeeded: row.isPowerCordDamaged ? "Y" : "N" // short hand for if (row.isPowerCordDamaged === true) return "Y" else return "N",
        quarter: moment(row.updatedAt).format("Qo"),
      })),
    [cartsRounded]
  );

看了之后您可能想 return Y 或 N 是否正确？在那种情况下，最好将其拉入一个函数中。

const isRepairNeeded = (row) => {

  if (row.isPowerCordDamaged) return "Y";
  if (row.isFuseBlown) return "Y";
  ... rest of the ifs
  return "N"; // N is only returned if none of the if statements === true;
}

const rows = useMemo(
    () =>
      cartsRounded.map((row, index) => ({
        ...row,
        id: index,
        serialNum: row.cartSerialNumber,
        pcNum: row.pcNumber,
        dateLastRounded: moment(row.updatedAt).format("MM-D-YYYY"),
        repairsNeeded: isRepairNeeded(row) // call the function will return "Y" or "N",
        quarter: moment(row.updatedAt).format("Qo"),
      })),
    [cartsRounded]
  );

If 语句内部映射

If Statement Inside Map

reactjs

mongodb

datagrid

material-ui