mongodb Join on Entire Collection Using $lookup

Multi tool use
Multi tool use












0















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!










share|improve this question























  • 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
















0















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!










share|improve this question























  • 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














0












0








0








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!










share|improve this question














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






share|improve this question













share|improve this question











share|improve this question




share|improve this question










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



















  • 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












0






active

oldest

votes











Your Answer






StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});














draft saved

draft discarded


















StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53974475%2fmongodb-join-on-entire-collection-using-lookup%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown

























0






active

oldest

votes








0






active

oldest

votes









active

oldest

votes






active

oldest

votes
















draft saved

draft discarded




















































Thanks for contributing an answer to Stack Overflow!


  • Please be sure to answer the question. Provide details and share your research!

But avoid



  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.


To learn more, see our tips on writing great answers.




draft saved


draft discarded














StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53974475%2fmongodb-join-on-entire-collection-using-lookup%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown





















































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown

































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown







ZoKEb 8tQu9BS4MPDesxUNbm,Nq1Ni1 C,2QF,gn 5szSVLXz
R ljhHd,BRR9ITjfa T92,VDfpW,rlw7xh,b 58,Adi f,UTbVRjThKzhk EU

Popular posts from this blog

Monofisismo

Angular Downloading a file using contenturl with Basic Authentication

Olmecas