Bit of a noob question. I'm using meteor-native-mongo on the server to access the aggregate function in MongoDB, however, I'm not sure how I return and access the results on the client side. In the past subscribing and then accessing the collections on the client was pretty straightforward using the collection.find({}) function, however, I don't understand how to do it with the aggregate function. Can someone please explain.
Meteor.publish('companies', function(limit) {
db.collection('companies').aggregate([{ $group: { _id: { location: "$google_maps.geometry_location" }, companies: { $addToSet: { name: "$company_name" } }, count: { $sum: 1} } }, { $match: { count: { $gt: 1 } } }]).toArray((err, result) => {
console.log(result);
return result;
});
});
Use this.added, this.changed, this.removed from https://docs.meteor.com/api/pubsub.html#Subscription-added ...
Meteor.publish('companies', function(limit) {
var subscription = this;
db.collection('companies').aggregate([{ $group: { _id: { location: "$google_maps.geometry_location" }, companies: { $addToSet: { name: "$company_name" } }, count: { $sum: 1} } }, { $match: { count: { $gt: 1 } } }]).toArray((err, result) => {
subscription.added('companies-aggregate', 'geometry-grouping', {result: result});
});
});
// On the client:
var CompaniesAggregate = new Mongo.Collection('companies-aggregate');
// Inside a reactive context, like a helper
var result = CompaniesAggregate.findOne('geometry-grouping').result;
Naturally, to make it reactive, you'd have to know when the results of the aggregations would change. There is no automatic way to do that--you would have to resolve that logically, with your own code.
The best way to do that is to save the subscription variable in an array somewhere in a higher scope, and called changed on all the subscriptions for 'companies' for the geometry-grouping document, computing an updated result.
The commenter's solution won't be realtime; in other words, if one user makes a change to the e.g. company name or location, another user won't see those changes.
Related
I just want to Publish the relational Data for a Publication to client, but the issue is my Relational Data field is array of ID's of a Different Collection, I tried Different Packages but all works with single Relational ID but not working with Array of relational ID's, let assume I have two Collection Companies and Meteor.users below is my Company Document Looks like
{
_id : "dYo4tqpZms9j8aG4C"
owner : "yjzakAgYWejmJcuHz"
name : "Labbaik Waters"
peoples : ["yjzakAgYWejmJcuHz", "yjzakAgYWejmJcuHz"],
createdAt: "2019-09-18T15:33:29.952+00:00"
}
here you can see peoples field contains the user ID's as Array, so How I publish this userId's as user Documents, as for example I tried the most popular meteor package named publishComposit, when I tried Loop in Children's find, I got undefined in children i.e below
publishComposite('compoundCompanies', {
find() {
// Find top ten highest scoring posts
return Companies.find({
owner: this.userId
}, {sort: {}});
},
children: [
{
find(company) {
let cursors = company.peoples.forEach(peopleId => {
console.log(peopleId)
return Meteor.users.find(
{ _id: peopleId },
{ fields: { profile: 1 } });
})
//here cursor undefined
console.log(cursors)
return cursors
}
}
]
});
and if I implement async loop in children's find I got error like below code
publishComposite('compoundCompanies', {
find() {
// Find top ten highest scoring posts
return Companies.find({
owner: this.userId
}, {sort: {}});
},
children: [
{
async find(company) {
let cursors = await company.peoples.forEach(peopleId => {
console.log(peopleId)
return Meteor.users.find(
{ _id: peopleId },
{ fields: { profile: 1 } });
})
//here cursor undefined
console.log(cursors)
return cursors
}
}
]
});
the error occured in above code is Exception in callback of async function: TypeError: this.cursor._getCollectionName is not a function
I don't know what I am exactly doing wrong here, or implementing package function not as intended any help will be greatly appropriated
EDIT: my desired result should be full user documents instead of ID no matter it mapped in same peoples array or as another fields I just want as below
{
_id: "dYo4tqpZms9j8aG4C",
owner: "yjzakAgYWejmJcuHz",
name: "Labbaik Waters",
peoples: [
{
profile: {firstName: "Abdul", lastName: "Hameed"},
_id: "yjzakAgYWejmJcuHz"
}
],
createdAt: "2019-09-18T15:33:29.952+00:00"
}
I ran into a similar problem couple of days ago. There are two problems with the provided code. First, using async; it's not needed and rather complicates things. Second, publishComposite relies on receiving one cursor not multiple within its children to work properly.
Below is a snippet of the code used to solve the problem I had, hopefully you can replicate it.
Meteor.publishComposite("table.conversations", function(table, ids, fields) {
if (!this.userId) {
return this.ready();
}
check(table, String);
check(ids, Array);
check(fields, Match.Optional(Object));
return {
find() {
return Conversation.find(
{
_id: {
$in: ids
}
},
{ fields }
);
},
children: [
{
find(conversation) {
// constructing one big cursor that entails all of the documents in one single go
// as publish composite cannot work with multiple cursors at once
return User.find(
{ _id: { $in: conversation.participants } },
{ fields: { profile: 1, roles: 1, emails: 1 } }
);
}
}
]
};
});
I want to update a collection called SMUProfiles, through a method called classroom.delete. I want to pull out the classroom_id from 2 places inside SMUProfiles i.e. one inside classrooms.owner which has an array of codes, and the other inside array classrooms.students.
I have successfully one the $set part, and now trying to add the $pull, but $pull doesn't seem to work.
Can we do the $set and $pull in such way?
/* Method for deleting Classroom */
'classroom.delete'(classroom_id) {
if (!this.userId) {
throw new Meteor.Error('not-authorised');
}
Classrooms.remove(classroom_id)
let classids = Classrooms.find({ owner: this.userId }).fetch().map(function(classrooms){
return classrooms._id })
//console.log(classids);
SMUProfiles.update({
owner: this.userId,
}, {
$set: {
'classrooms.owner': classids
},
$pull: {
'classrooms.students': classroom_id
}
}
)
}
You're trying to $set and $pull on the same field in the same update - the two operations conflict; so no, you can't use these operators in this way.
You could easily split this into two:
SMUProfiles.update(
{ owner: this.userId },
{ $set: { 'classrooms.owner': classids },
);
SMUProfiles.update(
{ owner: this.userId },
{ $pull: { 'classrooms.students': classroom_id },
);
See e.g. this answer
I trying to pass data that is fetched from the server to a popup.I tried doing something like this but its not working.Please help-
{
path:'/merchant/:id',
beforeEnter: function (routeTo, routeFrom, resolve, reject) {
console.log(routeTo.params.id);
Meteor.call('getOne',routeTo.params.id,(error,result) => {
if (result) {
resolve(
{
popup: {
el:document.querySelector('#sample-popup')
}
},
// Custom template context
{
context: {
users: result,
},
}
)
}
});
} ,
},
According to the docs, you use resolve callback wrong !
You can also read this understand how to achieve this
I'm publishing this user information (as a test FYI, not going to reveal all this information in production)
Meteor.publish('user.private', function userPrivate() {
if (!this.userId) {
return this.ready();
}
return Meteor.users.find({
_id: this.userId
}, {
fields: {
'services.microsoft': 1,
'services.google': 1
}
});
});
I'm subscribing like this:
Template.App_body.onCreated(function appBodyOnCreated() {
this.subscribe('user.private');
});
I've confirmed that this exact query works and returns data using meteor mongo, yet this information does not appear in the Meteor.user() call on the client. What am I doing wrong?
try changing the publication name to null to make it automatically publish.
Meteor.publish(null, function () {
return Meteor.users.find(this.userId, {
fields: { /** ... fields here */ }
});
});
I encounter an error using Meteor. I call an Method.method.
Template.WelcomeTemplate.events({
'click #btn-findgame': function(e) {
e.preventDefault();
console.log('clicked find game button');
Meteor.call('allocateGame', function(error, id) {
if (error) {
alert(error.reason);
} if (id) {
Router.go('gameRoom', {_id: id})
}
})
}
})
With my Method, I check if there is an room available, create one when the isn't otherwise join. And return the ID of this room.
Meteor.methods({
allocateGame: function () {
console.log('allocateGame method called')
var user = Meteor.user();
// find game where one player is in the room
var gameWaiting = Games.findOne({players: {$size: 1}})
if (!gameWaiting) {
console.log('no game available, create a new one');
var newGameId = Games.insert({players: [user._id], active: false, finished: false});
GameDetails.insert({gameId: newGameId, gameData: []});
return newGameId
} else {
if (_.contains(gameWaiting.players, user._id)) {
console.log('Cannot play against yourself sir')
} else {
console.log('Joining game');
Games.update({_id: gameWaiting._id}, {
$set: {active: true},
$push: {players: user._id}
});
return gameWaiting._id;
}
};
}
})
And my Router:
Router.map(function () {
this.route('welcome', {
path: '/',
controller: WelcomeController})
this.route('gameRoom', {
path: '/game/_:id'
})
});
The Error I recieve is:
Exception in delivering result of invoking 'allocateGame': TypeError: Cannot read property 'charAt' of null
at Object.IronLocation.set (http://localhost:3000/packages/iron-router.js?e9fac8016598ea034d4f30de5f0d356a9a24b6c5:1293:12)
And indeed, If I don't return an ID the Routing will continue as normal. However when I return an ID in my WelcomeTemplate an error will occur.
EDIT:
Even thought my MongoDB is updating my MiniMongo DB is empty. There must be a problem with syncing. Any idea where to look?
In the route, you set the path to be '/game/_:id', that is, a parameter with the name id. In your call to Router.go, you pass a parameter with the name _id.
Don't know if this solves your problem, but it's an error.
This kind of embarrassing taking in account how many hours I've spent on fixing this. The error was created because of an error in my routers.js
this.route('gameRoom', {
path: '/game/_:id'
})
Should be:
this.route('gameRoom', {
path: '/game/:_id'
})
Happy coding.