The meteor server has the ability to connect to the database, while the client is unable to access

As a newcomer to Meteor, I am trying to access data from my local MongoDB database. In my project structure, the client folder contains a client.js file with the following code:

Meteor.subscribe('Signal');
console.log(Data.find().fetch());

In the server directory, there is a main.js file that includes the following code:

console.log(Data.find());

Meteor.publish('Signal', function() {
   return Data.find().fetch();
});

While the server's console.log displays the result in the terminal, nothing appears in the client's Chrome console.

Additionally, within the lib/ directory, I have a collections.js file that defines the 'Data' collection as follows:

Data = new Mongo.Collection('data');

Upon checking the MongoDB database through the shell, I can see that the 'data' collection exists with the required data. Despite this, I am unable to retrieve the data in my Meteor application. What could be causing this issue?

Answer №1

It is important to remember that calling Meteor.subscribe() on the client side does not happen instantly. The data publication process may take some time to populate documents to the client.

Thankfully, when you use Meteor.subscribe(), it provides a subscription handle which can indicate when the subscription is ready to be used.

const handle = Meteor.subscribe('Signal');
Tracker.autorun(() => {
  if (handle.ready()) {
    // The subscription is now ready
    console.log(Data.find().fetch());
  }
});

Another approach is to include an onReady callback function as the last parameter in your Meteor.subscribe() call:

Meteor.subscribe('Signal', () => {
  // Subscription is ready to be used
  console.log(Data.find().fetch());
});

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