等待承诺的结束循环？

Question

我怎么能等到循环结束，获取图像的路径，然后将其注入到查询中？

创建数据前：

let images = [];
for ( const file in files ) {
    fs.writeFileSync(  __dirname + '/'+file+'.jpg', files[file].data );
    uploads( __dirname + '/'+file+'.jpg', 'smoothies/recipes' )
        .then( ( resolve ) => {
            images.push('https://res.cloudinary.com/###########' + resolve.public_id) ;
        } )
        .then( () => {
            console.log('images uploaded here path => ', images);
            fs.unlinkSync(  __dirname + '/'+file+'.jpg' );
            console.log('file removed here ');
            //file removed
        })
        .catch( ( error ) => {
            res.status( 500 ).send( {
                message:"failure tu upload the image",
                error,
            } );
        } );
}

Recipe.create( { name, ingredients, steps, images } )
    .then( async () => {
        let recipes = await Recipe.find();
        res.status( 201 ).json( recipes );
    } )
    .catch( ( error ) => {
        res.status( 500 ).send( {
            message:"failure to create the Recipe with images",
            error,
        } );
    } );

我找不到解决方案。

谢谢。

Answer 1

您可以切换到使用 await 并像这样使用 fs 函数的承诺版本：

const fsp = fs.promises;

let images = [];
try {
    for (const file in files) {
        const filename = __dirname + '/' + file + '.jpg';
        await fsp.writeFile(filename, files[file].data);
        let resolve = await uploads(filename, 'smoothies/recipes');
        images.push('https://res.cloudinary.com/###########' + resolve.public_id);
        console.log('images uploaded here path => ', images);
        await fsp.unlink(filename);
        console.log('file removed here ');
    }
} catch (error) {
    res.status(500).send({
        message: "failure tu upload the image",
        error,
    });
    return;
}

try {
    await Recipe.create({ name, ingredients, steps, images });
    let recipes = await Recipe.find();
    res.status(201).json(recipes);
} catch (error) {
    res.status(500).send({
        message: "failure to create the Recipe with images",
        error,
    });
    return;
}

并且，包含函数需要标记为 async。

等待承诺的结束循环？

waiting the ending loop of promise?

javascript

node.js

mongoose

async-await

cloudinary