How can you sort an array by its' inner array size with nodejs?
everyone. I'm very new to this backend thing, and i'm starting to figure out the basics.
I made a basic system of posts and comments on NodeJS and mongoose.
The thing is now i want to get the post with the most comments so in the homepage i can show the most popular ones.
I want to return the posts that have the largest array of comment ids.
I first tried doing this:
var mysort = { comments: 1 };
Post.find( {} )
.sort(mysort)
.exec( (err, posts)=>{
if(err) {
return res.status(400).json({
ok: false,
message: 'Error loading posts',
});
}
return res.status(200).json({
ok: true,
posts: posts
});
});
But it just returns the comments in an alphabetical order.
Thank you very much for your help and sorry for my bad english.
javascript node.js mongodb mongoose
edited Jan 1 at 20:34
Rinzler786
71111
asked Jan 1 at 19:23
TagzTagz
155
add a comment |
everyone. I'm very new to this backend thing, and i'm starting to figure out the basics.
I made a basic system of posts and comments on NodeJS and mongoose.
The thing is now i want to get the post with the most comments so in the homepage i can show the most popular ones.
I want to return the posts that have the largest array of comment ids.
I first tried doing this:
var mysort = { comments: 1 };
Post.find( {} )
.sort(mysort)
.exec( (err, posts)=>{
if(err) {
return res.status(400).json({
ok: false,
message: 'Error loading posts',
});
}
return res.status(200).json({
ok: true,
posts: posts
});
});
But it just returns the comments in an alphabetical order.
Thank you very much for your help and sorry for my bad english.
javascript node.js mongodb mongoose
edited Jan 1 at 20:34
Rinzler786
71111
asked Jan 1 at 19:23
TagzTagz
155
add a comment |
everyone. I'm very new to this backend thing, and i'm starting to figure out the basics.
I made a basic system of posts and comments on NodeJS and mongoose.
The thing is now i want to get the post with the most comments so in the homepage i can show the most popular ones.
I want to return the posts that have the largest array of comment ids.
I first tried doing this:
var mysort = { comments: 1 };
Post.find( {} )
.sort(mysort)
.exec( (err, posts)=>{
if(err) {
return res.status(400).json({
ok: false,
message: 'Error loading posts',
});
}
return res.status(200).json({
ok: true,
posts: posts
});
});
But it just returns the comments in an alphabetical order.
Thank you very much for your help and sorry for my bad english.
javascript node.js mongodb mongoose
edited Jan 1 at 20:34
Rinzler786
71111
asked Jan 1 at 19:23
TagzTagz
155
everyone. I'm very new to this backend thing, and i'm starting to figure out the basics.
I made a basic system of posts and comments on NodeJS and mongoose.
The thing is now i want to get the post with the most comments so in the homepage i can show the most popular ones.
I want to return the posts that have the largest array of comment ids.
I first tried doing this:
var mysort = { comments: 1 };
Post.find( {} )
.sort(mysort)
.exec( (err, posts)=>{
if(err) {
return res.status(400).json({
ok: false,
message: 'Error loading posts',
});
}
return res.status(200).json({
ok: true,
posts: posts
});
});
But it just returns the comments in an alphabetical order.
Thank you very much for your help and sorry for my bad english.
javascript node.js mongodb mongoose
javascript node.js mongodb mongoose
edited Jan 1 at 20:34
Rinzler786
71111
asked Jan 1 at 19:23
TagzTagz
155
edited Jan 1 at 20:34
Rinzler786
71111
asked Jan 1 at 19:23
TagzTagz
155
edited Jan 1 at 20:34
Rinzler786
71111
edited Jan 1 at 20:34
Rinzler786
71111
edited Jan 1 at 20:34
Rinzler786
71111
71111
asked Jan 1 at 19:23
TagzTagz
155
asked Jan 1 at 19:23
TagzTagz
155
asked Jan 1 at 19:23
TagzTagz
155
155
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
You need Aggregation Framework and $size operator to create temporary field using $addFields and then you can use $sort to sort by that field (-1 means descending order)
Post.aggregate([
{
$addFields: {
commentsCount: { $size: "$comments" }
}
},
{
$sort: { commentsCount: -1 }
}
]).exec( (err, posts)=>{
if(err) {
return res.status(400).json({
ok: false,
message: 'Error loading posts',
});
}
return res.status(200).json({
ok: true,
posts: posts
});
});
answered Jan 1 at 19:29
micklmickl
14.1k51637
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You need Aggregation Framework and $size operator to create temporary field using $addFields and then you can use $sort to sort by that field (-1 means descending order)
Post.aggregate([
{
$addFields: {
commentsCount: { $size: "$comments" }
}
},
{
$sort: { commentsCount: -1 }
}
]).exec( (err, posts)=>{
if(err) {
return res.status(400).json({
ok: false,
message: 'Error loading posts',
});
}
return res.status(200).json({
ok: true,
posts: posts
});
});
answered Jan 1 at 19:29
micklmickl
14.1k51637
add a comment |
You need Aggregation Framework and $size operator to create temporary field using $addFields and then you can use $sort to sort by that field (-1 means descending order)
Post.aggregate([
{
$addFields: {
commentsCount: { $size: "$comments" }
}
},
{
$sort: { commentsCount: -1 }
}
]).exec( (err, posts)=>{
if(err) {
return res.status(400).json({
ok: false,
message: 'Error loading posts',
});
}
return res.status(200).json({
ok: true,
posts: posts
});
});
answered Jan 1 at 19:29
micklmickl
14.1k51637
add a comment |
You need Aggregation Framework and $size operator to create temporary field using $addFields and then you can use $sort to sort by that field (-1 means descending order)
Post.aggregate([
{
$addFields: {
commentsCount: { $size: "$comments" }
}
},
{
$sort: { commentsCount: -1 }
}
]).exec( (err, posts)=>{
if(err) {
return res.status(400).json({
ok: false,
message: 'Error loading posts',
});
}
return res.status(200).json({
ok: true,
posts: posts
});
});
answered Jan 1 at 19:29
micklmickl
14.1k51637
You need Aggregation Framework and $size operator to create temporary field using $addFields and then you can use $sort to sort by that field (-1 means descending order)
Post.aggregate([
{
$addFields: {
commentsCount: { $size: "$comments" }
}
},
{
$sort: { commentsCount: -1 }
}
]).exec( (err, posts)=>{
if(err) {
return res.status(400).json({
ok: false,
message: 'Error loading posts',
});
}
return res.status(200).json({
ok: true,
posts: posts
});
});
answered Jan 1 at 19:29
micklmickl
14.1k51637
answered Jan 1 at 19:29
micklmickl
14.1k51637
answered Jan 1 at 19:29
micklmickl
14.1k51637
answered Jan 1 at 19:29
micklmickl
14.1k51637
14.1k51637
add a comment |
add a comment |
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