Fetching json from Mongo with Meteor - mongodb

Question

I am trying to fetch a json object from the mongodb using meteor, but I have no clue why I’m unable to do so.
I need it to be a JSON object only.
One of the entries of the collection looks like this:
[Image taken from Meteor Dev Tools]
Link: https://i.stack.imgur.com/BxRmS.png
I’m trying to fetch the value part by passing the name.
Code on front end:
export default withTracker(() => {
let aSub = Meteor.subscribe(‘allEntries’);
return {
aBoundaries: DataCollection.find({}).fetch()
}
})(Component Name);
The Meteor Call Statement on front-end:
dataFromDb = Meteor.call(‘functionToBeCalled’, ‘Sydney’);
Server-side Code:
Meteor.publish(‘allEntries’, function(){
return DataCollection.find();
});
Meteor.methods({
functionToBeCalled(aName){
return DataCollection.find({name: aName});
}
});
Another of my questions is:
Is there any way that we publish only all the names in the beginning and then publish the values on demand?
Thanks for your help in advance!
I have tried this as well, but it did not work:
functionToBeCalled(aName){
var query = {};
query['name'] = aName;
return DataCollection.find(query).fetch();
}

Answer 1

The issue seems to be with query.
Collection.find() returns data with cursor.
To get an array of objects, use Collection.find().fetch(). The jsons are returned as collection of array like [{json1}, {json2}].
If there is a single document, you can access the json using Collection.find().fetch()[0]. Another alternative is to use findOne. Example - Collection.findOne(). This will return a single JSON object.

Answer 2

use Meteor.subscribe('allEntries'), do not assign it to a variable.
Meteor.subscribe is asynchronous, it's best you ensure that your subscriptions are ready before you fetch data.
Log DataCollection.find({}).fetch() to your console
Check this official reference https://docs.meteor.com/api/pubsub.html#Meteor-subscribe.
Your second question isn't that clear.

Answer 3

Just in case anyone comes here to look for the answer ~~~
So... I was able to make it work with this code on the server:
Meteor.methods({
functionToBeCalled(aName){
console.log(aName);
return DataCollection.findOne({name: aName});
}
});
And this on the client:
Meteor.call('functionToBeCalled', nameToBePassed, (error,response) => {
console.log(error, "error");
console.log(response, "response"); //response here
})
Thanks for the help!