Hi all,
I did the official to-do-list tutorial and managed to adapt this with my custom needs. I added a price for the tasks that I can display on my template. But I can’t show the total price and I don’t understand how could I use aggregate despite reading the forum :
using rawCollection seems easier for me than installing another package called tunguska:reactive-aggregate
It is frustrating because as you imagine, my mongoDB query works on Robo3T and I can’t use it in my project,
Thanks for your help,
Elie
const result = Promise.await(
Collection.rawCollection()
.aggregate([pipelines])
.toArray()
);
1 Like
Hi, thanks for your answer, could you comment a little your code, please ? I am not sure to fully understand where should I use it !
my MongoDB query that works in Robo3t = pipelines
Thanks for yor help, I understand that, but should this function be in the /ui folder, inside a helper? Like that?
Template.mytemplate.helpers({
myValue: function() {
const result = Promise.await(
Collection.rawCollection()
.aggregate([pipelines])
.toArray()
);
})
Aggregations need to run on server side, not client side. So put that code inside a method that is located somewhere (anywhere) under the ‘server’ directory. And then can call that method from client side (UI) code.
Hi, thanks a lot for your answer, it helped. There is also this link that was usefull:
https://docs.meteor.com/api/methods.html
Now I can display my result on the server side, and I was able to console.log() in the console browser using a Promise. I think it is a good sign, but all I display on the webpage itself is [object Promise]. If you know what I am missing, please comment!
Here’s my code sample in ui inside a helpers:
toDisplay: async function() {
const methodCall = (methodName, ...args) =>
new Promise((resolve, reject) => {
Meteor.call(methodName, ...args, (error, result) => {
if (error) reject(error);
else resolve(result);
});
});
const totalFeatures = methodCall('bar')
let resultToReturn = await totalFeatures.then(function(result) {
return result
})
return resultToReturn
}
Have a great day
To make sure you’re actually returning results from the server side method to your client side code, just add a console.log(result) above this line in your code: if (error) reject(error);
If not, look at this article on how to handle async code in methods. I suggest using the async/await approach:
If the console log shows that the result are actually reaching the client side code, then the problem is probably that you are not using the results in a reactive variable. Don’t really remember what are the options in Blaze for these situations. Maybe somebody that still uses Blaze can help you out.
Thanks again, I could console.log() in the browser’s console the results, so I assumed my problem comes from this Reactive concept of Meteor.
After a lot of time, I re-arranged the code with .onCreated and .helpers, like so:
I chose to use ReactiveDict because I know it’s already in my project’s package.
Template.taskfeatures.onCreated(async function () {
const methodCall = (methodName, ...args) =>
new Promise((resolve, reject) => {
Meteor.call(methodName, ...args, (error, result) => {
if (error) reject(error);
else resolve(result);
});
});
const totalFeatures = methodCall('bar')
let feat = await totalFeatures.then(function(result) {
return result
})
this.state = new ReactiveDict();
this.state.set('myTotalResults', feat);
});
Template.taskfeatures.helpers({
priceSum() {
const inst = Template.instance();
return inst.state.get('myTotalResults');
}
});
but I have the same problems as before, the result is not accessible in the html template.
In the template I also used the .subscriptionsReady to avoid some kind of meteor Exception in template helper visible in the console, like so:
{{#if taskfeatures.subscriptionsReady}}
<p>{{priceSum}}</p>
{{else}}
<p>Loading...</p>
{{/if}}
If you have an idea of what’s going on, please share, cheers