how to get information of another collection with lookup
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0
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I have 2 collections: Movie and User. in Movie I saved information about movies such as stars who actors that play in movie. i saved this field as an array in Movie collection. now I want to write a query that return stars name. but this name field saved in User collection. how can I extract data from another collection to this collection? I write this function but it's wrong and stars_doc is empty.
this is my function :
async function starsActMostMovies(){
const res = await Movie.aggregate([
{
$unwind: '$stars'
}
,
{
$lookup:
{
from: "User",
localField: "_id",
foreignField : "stars",
as: "stars_doc"
}
}
,
{
$group: {
_id : '$stars' ,
count : { $sum : 1}
}
}
,
{$sort: {count: -1}}
])
return res
}
starsActMostMovies().then(function(result){
console.log(result)})
and in this link I wrote my database models.
mongoose aggregation
asked Nov 10 at 13:06
Fahom
275
add a comment |
up vote
0
down vote
favorite
I have 2 collections: Movie and User. in Movie I saved information about movies such as stars who actors that play in movie. i saved this field as an array in Movie collection. now I want to write a query that return stars name. but this name field saved in User collection. how can I extract data from another collection to this collection? I write this function but it's wrong and stars_doc is empty.
this is my function :
async function starsActMostMovies(){
const res = await Movie.aggregate([
{
$unwind: '$stars'
}
,
{
$lookup:
{
from: "User",
localField: "_id",
foreignField : "stars",
as: "stars_doc"
}
}
,
{
$group: {
_id : '$stars' ,
count : { $sum : 1}
}
}
,
{$sort: {count: -1}}
])
return res
}
starsActMostMovies().then(function(result){
console.log(result)})
and in this link I wrote my database models.
mongoose aggregation
asked Nov 10 at 13:06
Fahom
275
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I have 2 collections: Movie and User. in Movie I saved information about movies such as stars who actors that play in movie. i saved this field as an array in Movie collection. now I want to write a query that return stars name. but this name field saved in User collection. how can I extract data from another collection to this collection? I write this function but it's wrong and stars_doc is empty.
this is my function :
async function starsActMostMovies(){
const res = await Movie.aggregate([
{
$unwind: '$stars'
}
,
{
$lookup:
{
from: "User",
localField: "_id",
foreignField : "stars",
as: "stars_doc"
}
}
,
{
$group: {
_id : '$stars' ,
count : { $sum : 1}
}
}
,
{$sort: {count: -1}}
])
return res
}
starsActMostMovies().then(function(result){
console.log(result)})
and in this link I wrote my database models.
mongoose aggregation
asked Nov 10 at 13:06
Fahom
275
I have 2 collections: Movie and User. in Movie I saved information about movies such as stars who actors that play in movie. i saved this field as an array in Movie collection. now I want to write a query that return stars name. but this name field saved in User collection. how can I extract data from another collection to this collection? I write this function but it's wrong and stars_doc is empty.
this is my function :
async function starsActMostMovies(){
const res = await Movie.aggregate([
{
$unwind: '$stars'
}
,
{
$lookup:
{
from: "User",
localField: "_id",
foreignField : "stars",
as: "stars_doc"
}
}
,
{
$group: {
_id : '$stars' ,
count : { $sum : 1}
}
}
,
{$sort: {count: -1}}
])
return res
}
starsActMostMovies().then(function(result){
console.log(result)})
and in this link I wrote my database models.
mongoose aggregation
mongoose aggregation
asked Nov 10 at 13:06
Fahom
275
asked Nov 10 at 13:06
Fahom
275
edited Nov 10 at 13:12
asked Nov 10 at 13:06
Fahom
275
asked Nov 10 at 13:06
Fahom
275
asked Nov 10 at 13:06
Fahom
275
275
add a comment |
add a comment |
1 Answer
1
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0
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Looking at your database models I think you may have the incorrect ref string in your movie schema definition. Inside of your movie schema you have:
stars:[{
type: Schema.Types.ObjectId,
ref: 'userSchema'
}],
but your user model is defined as:
var User = mongoose.model('user', userSchema);
The ref in your movie schema needs to refer to the name you give the user model which is in this case is 'user' not userSchema
answered Nov 10 at 16:11
Bobby
161
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
up vote
0
down vote
accepted
Looking at your database models I think you may have the incorrect ref string in your movie schema definition. Inside of your movie schema you have:
stars:[{
type: Schema.Types.ObjectId,
ref: 'userSchema'
}],
but your user model is defined as:
var User = mongoose.model('user', userSchema);
The ref in your movie schema needs to refer to the name you give the user model which is in this case is 'user' not userSchema
answered Nov 10 at 16:11
Bobby
161
add a comment |
up vote
0
down vote
accepted
Looking at your database models I think you may have the incorrect ref string in your movie schema definition. Inside of your movie schema you have:
stars:[{
type: Schema.Types.ObjectId,
ref: 'userSchema'
}],
but your user model is defined as:
var User = mongoose.model('user', userSchema);
The ref in your movie schema needs to refer to the name you give the user model which is in this case is 'user' not userSchema
answered Nov 10 at 16:11
Bobby
161
add a comment |
up vote
0
down vote
accepted
up vote
0
down vote
accepted
Looking at your database models I think you may have the incorrect ref string in your movie schema definition. Inside of your movie schema you have:
stars:[{
type: Schema.Types.ObjectId,
ref: 'userSchema'
}],
but your user model is defined as:
var User = mongoose.model('user', userSchema);
The ref in your movie schema needs to refer to the name you give the user model which is in this case is 'user' not userSchema
answered Nov 10 at 16:11
Bobby
161
Looking at your database models I think you may have the incorrect ref string in your movie schema definition. Inside of your movie schema you have:
stars:[{
type: Schema.Types.ObjectId,
ref: 'userSchema'
}],
but your user model is defined as:
var User = mongoose.model('user', userSchema);
The ref in your movie schema needs to refer to the name you give the user model which is in this case is 'user' not userSchema
answered Nov 10 at 16:11
Bobby
161
answered Nov 10 at 16:11
Bobby
161
answered Nov 10 at 16:11
Bobby
161
answered Nov 10 at 16:11
Bobby
161
161
add a comment |
add a comment |
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