mongodb Join on Entire Collection Using $lookup
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I'm struggling how to do a join in mongodb using $lookup
. I want this join to happen whenever the game
collection is called upon.
I have two collections: game
and boxart
.
game
collection
{ "guid": 123, name: "Halo" }
boxart
collection
{ "releaseId": 123, image: "https://someurl.com/image.jpg" }
index.js
MongoClient.connect(dbConfig.url, { useNewUrlParser: true }, (err, database) => {
db = database.db("cello_db");
db.collection('game')
.aggregate([
{ $lookup:
{
from: 'boxart',
localField: 'releaseId',
foreignField: 'guid',
as: 'art'
}
},
]);
require('./routes')(app, db);
});
routes.js
module.exports = function(app, db) {
app.get('/games', (req, res) => {
db.collection('game').find().toArray((err, games) => {
res.send(games);
});
});
};
When I call my /games
endpoint however, I don't get the joined collection. What I expect to get is this:
{ "guid": 123, name: "Halo", art: { "releaseId": 123, image: "https://someurl.com/image.jpg" } }
What I ACTUALLY get is this:
{ "guid": 123, name: "Halo" }
I'm clearly not doing something right. I'm new to the backend and have only used mongodb for a couple of hours. Any help would be appreciated. Thanks in advance!
mongodb left-join lookup
add a comment |
I'm struggling how to do a join in mongodb using $lookup
. I want this join to happen whenever the game
collection is called upon.
I have two collections: game
and boxart
.
game
collection
{ "guid": 123, name: "Halo" }
boxart
collection
{ "releaseId": 123, image: "https://someurl.com/image.jpg" }
index.js
MongoClient.connect(dbConfig.url, { useNewUrlParser: true }, (err, database) => {
db = database.db("cello_db");
db.collection('game')
.aggregate([
{ $lookup:
{
from: 'boxart',
localField: 'releaseId',
foreignField: 'guid',
as: 'art'
}
},
]);
require('./routes')(app, db);
});
routes.js
module.exports = function(app, db) {
app.get('/games', (req, res) => {
db.collection('game').find().toArray((err, games) => {
res.send(games);
});
});
};
When I call my /games
endpoint however, I don't get the joined collection. What I expect to get is this:
{ "guid": 123, name: "Halo", art: { "releaseId": 123, image: "https://someurl.com/image.jpg" } }
What I ACTUALLY get is this:
{ "guid": 123, name: "Halo" }
I'm clearly not doing something right. I'm new to the backend and have only used mongodb for a couple of hours. Any help would be appreciated. Thanks in advance!
mongodb left-join lookup
This is how $lookup behave ... If you are looking left join like operator attributes from both then you should look for for each... docs.mongodb.com/manual/reference/operator/aggregation/lookup
– sandeep rawat
Dec 30 '18 at 1:10
I think you have localField and foreignField reversed
– GBackMania
Dec 30 '18 at 2:49
Switch your local and ForeignField.{ $lookup: { from: 'boxart', localField: 'guid', foreignField: 'releaseId', as: 'art' } },
– Anthony Winzlet
Dec 30 '18 at 4:35
add a comment |
I'm struggling how to do a join in mongodb using $lookup
. I want this join to happen whenever the game
collection is called upon.
I have two collections: game
and boxart
.
game
collection
{ "guid": 123, name: "Halo" }
boxart
collection
{ "releaseId": 123, image: "https://someurl.com/image.jpg" }
index.js
MongoClient.connect(dbConfig.url, { useNewUrlParser: true }, (err, database) => {
db = database.db("cello_db");
db.collection('game')
.aggregate([
{ $lookup:
{
from: 'boxart',
localField: 'releaseId',
foreignField: 'guid',
as: 'art'
}
},
]);
require('./routes')(app, db);
});
routes.js
module.exports = function(app, db) {
app.get('/games', (req, res) => {
db.collection('game').find().toArray((err, games) => {
res.send(games);
});
});
};
When I call my /games
endpoint however, I don't get the joined collection. What I expect to get is this:
{ "guid": 123, name: "Halo", art: { "releaseId": 123, image: "https://someurl.com/image.jpg" } }
What I ACTUALLY get is this:
{ "guid": 123, name: "Halo" }
I'm clearly not doing something right. I'm new to the backend and have only used mongodb for a couple of hours. Any help would be appreciated. Thanks in advance!
mongodb left-join lookup
I'm struggling how to do a join in mongodb using $lookup
. I want this join to happen whenever the game
collection is called upon.
I have two collections: game
and boxart
.
game
collection
{ "guid": 123, name: "Halo" }
boxart
collection
{ "releaseId": 123, image: "https://someurl.com/image.jpg" }
index.js
MongoClient.connect(dbConfig.url, { useNewUrlParser: true }, (err, database) => {
db = database.db("cello_db");
db.collection('game')
.aggregate([
{ $lookup:
{
from: 'boxart',
localField: 'releaseId',
foreignField: 'guid',
as: 'art'
}
},
]);
require('./routes')(app, db);
});
routes.js
module.exports = function(app, db) {
app.get('/games', (req, res) => {
db.collection('game').find().toArray((err, games) => {
res.send(games);
});
});
};
When I call my /games
endpoint however, I don't get the joined collection. What I expect to get is this:
{ "guid": 123, name: "Halo", art: { "releaseId": 123, image: "https://someurl.com/image.jpg" } }
What I ACTUALLY get is this:
{ "guid": 123, name: "Halo" }
I'm clearly not doing something right. I'm new to the backend and have only used mongodb for a couple of hours. Any help would be appreciated. Thanks in advance!
mongodb left-join lookup
mongodb left-join lookup
asked Dec 30 '18 at 0:46
realphrealph
1,51483071
1,51483071
This is how $lookup behave ... If you are looking left join like operator attributes from both then you should look for for each... docs.mongodb.com/manual/reference/operator/aggregation/lookup
– sandeep rawat
Dec 30 '18 at 1:10
I think you have localField and foreignField reversed
– GBackMania
Dec 30 '18 at 2:49
Switch your local and ForeignField.{ $lookup: { from: 'boxart', localField: 'guid', foreignField: 'releaseId', as: 'art' } },
– Anthony Winzlet
Dec 30 '18 at 4:35
add a comment |
This is how $lookup behave ... If you are looking left join like operator attributes from both then you should look for for each... docs.mongodb.com/manual/reference/operator/aggregation/lookup
– sandeep rawat
Dec 30 '18 at 1:10
I think you have localField and foreignField reversed
– GBackMania
Dec 30 '18 at 2:49
Switch your local and ForeignField.{ $lookup: { from: 'boxart', localField: 'guid', foreignField: 'releaseId', as: 'art' } },
– Anthony Winzlet
Dec 30 '18 at 4:35
This is how $lookup behave ... If you are looking left join like operator attributes from both then you should look for for each... docs.mongodb.com/manual/reference/operator/aggregation/lookup
– sandeep rawat
Dec 30 '18 at 1:10
This is how $lookup behave ... If you are looking left join like operator attributes from both then you should look for for each... docs.mongodb.com/manual/reference/operator/aggregation/lookup
– sandeep rawat
Dec 30 '18 at 1:10
I think you have localField and foreignField reversed
– GBackMania
Dec 30 '18 at 2:49
I think you have localField and foreignField reversed
– GBackMania
Dec 30 '18 at 2:49
Switch your local and ForeignField.
{ $lookup: { from: 'boxart', localField: 'guid', foreignField: 'releaseId', as: 'art' } },
– Anthony Winzlet
Dec 30 '18 at 4:35
Switch your local and ForeignField.
{ $lookup: { from: 'boxart', localField: 'guid', foreignField: 'releaseId', as: 'art' } },
– Anthony Winzlet
Dec 30 '18 at 4:35
add a comment |
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This is how $lookup behave ... If you are looking left join like operator attributes from both then you should look for for each... docs.mongodb.com/manual/reference/operator/aggregation/lookup
– sandeep rawat
Dec 30 '18 at 1:10
I think you have localField and foreignField reversed
– GBackMania
Dec 30 '18 at 2:49
Switch your local and ForeignField.
{ $lookup: { from: 'boxart', localField: 'guid', foreignField: 'releaseId', as: 'art' } },
– Anthony Winzlet
Dec 30 '18 at 4:35