数据表格 - 服务器端行分组 🧪

const customDataSource: GridDataSource = {
  getRows: async (params) => {
    // Fetch the data from the server.
  },
  getGroupKey: (row) => {
    // Return the group key for the row, e.g. `name`.
    return row.name;
  },
  getChildrenCount: (row) => {
    // Return the number of children for the row.
    return row.childrenCount;
  },
};

const getRows: async (params) => {
  const urlParams = new URLSearchParams({
    // Example: JSON.stringify(['20th Century Fox', 'James Cameron'])
    groupKeys: JSON.stringify(params.groupKeys),
    // Example: JSON.stringify(['company', 'director'])
    groupFields: JSON.stringify(params.groupFields),
  });
  const getRowsResponse = await fetchRows(
    // Server should group the data based on `groupFields` and
    // extract the rows for the nested level based on `groupKeys`.
    `https://mui.org.cn/x/api/data-grid?${urlParams.toString()}`,
  );
  return {
    rows: getRowsResponse.rows,
    rowCount: getRowsResponse.rowCount,
  };
}