Sequelize js reformat nested response - node.js

Question

I am using PostgreSQL as database and Sequelize JS to Query my database. One of the APIs has below code
var video_attributes = [[sequelize.cast(sequelize.fn("like_count", Sequelize.col("video_id")), 'integer'), "total_likes"]];
if (request.user) {
video_attributes.push([sequelize.fn("has_liked", request.user.id, Sequelize.col("user_bookmark.video_id")), "is_liked"]);
video_attributes.push([sequelize.fn("has_bookmarked", request.user.id, Sequelize.col("user_bookmark.video_id")), "is_bookmarked"]);
}
mod_idx.user_bookmark.findAll({
where: {"user_id": request.user.id},
include : [{
model:mod_idx.video, as: "video",
attributes: {include: video_attributes}
}],
attributes: {exclude: ["user_id", "video_id", "id"]},
order: [[
"id",
"desc"
]],
}).then(video_list => {
let r = { "data": video_list, "success": true }
response.status(200).json(r)
}).catch(function (err) {
console.log(err)
});
It returns below response:
{
"data": [
{
"video": {
"id": 189,
"total_likes": 0,
"is_liked": false,
"is_bookmarked": true
}
},
{
"video": {
"id": 261,
"total_likes": 0,
"is_liked": false,
"is_bookmarked": true
}
}
],
"success": true
}
Expected result:
{
"data": [
{
"id": 189,
"total_likes": 0,
"is_liked": false,
"is_bookmarked": true
},
{
"id": 261,
"total_likes": 0,
"is_liked": false,
"is_bookmarked": true
}
],
"success": true
}
I tried by making "raw" as true but it returns column names as 'video.column_name' (https://stackoverflow.com/a/53612698/1030951).
I don't want to use map function as it may slowdown while processing large number of records.

Answer 1

It is not pretty but you can do this by adding all attributes at top level.
mod_idx.user_bookmark.findAll({
where: {"user_id": request.user.id},
include : [{
model:mod_idx.video, as: "video",
attributes: [] // Do not include anything in nested object
}],
attributes: [
[sequelize.cast(sequelize.fn("like_count", Sequelize.col("video.video_id")), 'integer'), "total_likes"]
// Add more here
],
order: [[
"id",
"desc"
]],
})
================================================================
Update
You can do something like this. One thing to consider here is that you must avoid the column name conflicts across multiple tables (as you are putting all attributes at top level), so add exclude or rename to make sure you handle the conflicts.
I demonstrate here for a scenario that I want to include all video attributes except certain columns to avoid conflicts.
const videoExcludeList = ['createdAt', 'updatedAt'];
// Get all video attributes minus exclude list.
const videoAttrs = Object.keys(mod_idx.video.rawAttributes)
.filter((v) => !videoExcludeList.includes(v))
.map((v) => Sequelize.col(`video.${v}`));
// Custom attributes that uses fn/rename/etc
const customAttrs = [
[sequelize.cast(sequelize.fn("like_count", Sequelize.col("video.video_id")), 'integer'), "total_likes"],
// Add more here.
]
You can also combine with top-level exclude to exclude columns from user_bookmark.
mod_idx.user_bookmark.findAll({
where: {"user_id": request.user.id},
include : [{
model:mod_idx.video, as: "video",
attributes: [] // Do not include anything in nested object
}],
attributes: {
exclude: ['id'], // exclude these columns from user_bookmark
include: [...videoAttrs, ...customAttrs],
},
order: [[
"id",
"desc"
]],
raw: true // You need this.
})