javascript - 在另一个方法中等待方法结束

Question

我正在尝试构建一个删除目录中未使用文件的函数。我在这种方法中使用 Sequelize ORM 来获取配方。
这是我的代码

exports.deleteImagesNotUsed = (req, res) => {
 // Method who send me the result at the end
 const callBack = (listFiles, counter, counterfilesDeleted) => {
     if (listFiles.length === counter) {
      switch (counterfilesDeleted) {
       case 0:
        res.send({message: "No file deleted."});
        break;

       case 1:
        res.send({message: "One file deleted."});
        break;

       default:
        res.send({message: `${counterfilesDeleted} files deleted.`});
        break;
      }
     }
 };

 const getFiles = (() => {
  const directory = "./uploads";
  let counter = 0;
  let counterfilesDeleted = 0;
  fs.promises.readdir(directory) // Get all files in directory
  .then(files => {
   files.forEach(file => {
    if (file !== "no-image.jpg") {
     Recipe.findOne({ // Select * from Recipe where imageFileName = file
       where: {       // It's method from Sequelize ORM
        imageFileName: file
       }
      })
      .then(data => {
       if (data == null) {
        const path = `${directory}/${file}`;
        fs.unlinkSync(path); // Delete the file
        counterfilesDeleted++;
       }
      });
    }
    counter++;
    callBack(files, counter, counterfilesDeleted);
   });
  });
 })();
}

我想在转到 counter++ 和 callBack(files, counter, counterfilesDeleted) 之前等待我的方法 Recipe.findOne 及其回调的结束。
谢谢你的帮助。

Answer 1

将该部分放在 then 方法中:

 const getFiles = (() => {
  const directory = "./uploads";
  let counter = 0;
  let counterfilesDeleted = 0;
  fs.promises.readdir(directory) // Get all files in directory
  .then(files => {
   files.forEach(file => {
    if (file !== "no-image.jpg") {
     Recipe.findOne({ // Select * from Recipe where imageFileName = file
       where: {       // It's method from Sequelize ORM
        imageFileName: file
       }
      })
      .then(data => {
       if (data == null) {
        const path = `${directory}/${file}`;
        fs.unlinkSync(path); // Delete the file
        counterfilesDeleted++;
       }
      })
      .then(() => {
        counter++;
        callBack(files, counter, counterfilesDeleted);
      });
    }
   });
  });
 })();