i have a post with text, images, videos and tags option. Except text rest are optional, now using async how can i handle if tags are empty then upload images and if no image is provided then upload video, and if all are given then how can i upload images, videos and then save in db?
following are sample inputs
images: [{"image":"image1"},{"image":"image2"}]
videos: [{"video":"video1"},{"video":"video2"}]
tags: [{"userId":2},{"userId":23} ]
text: having a good day :)
Use async parallel for your optional videos and images uploading. Inside parallel if your service does not allow multiple insertions then you need to use async each or map.
const async = require("async");
// example data
const data = {
images: [{"image":"image1"},{"image":"image2"}]
videos: [{"video":"video1"},{"video":"video2"}]
tags: [{"userId":2},{"userId":23} ]
text: "having a good day :)"
}
if(!data.text){
//return 'text is required' message
}
else{
const imageUrls = [];
const videoUrls = [];
// http://caolan.github.io/async/docs.html#parallel
async.parallel({
uploadImages: function(callback){
async.each(data.images, function(image, eachCallback){
// upload each image
// push returned url in imageUrls
// call return eachCallback(), or if err then return eachCallback(err)
}, function(err){
if(err){
return callback(err)
}
else{
return callback()
}
})
},
uploadVideos: function(callback){
async.each(data.videos, function(video, eachCallback){
// same process as images
}, function(err){
if(err){
return callback(err)
}
else{
return callback()
}
})
}
}, function(err, results){ //final callback of async parallel
if(err){
//handle err
}
else{
const obj = {
images: imageUrls,
videos: videoUrls,
tags: data.tags,
text: data.text
}
//insert obj to db and respond with success message
}
})
}
async