Syncing fields between collections in Meteor's MongoDB

I have a document for a scheduled meeting that looks like this:

{
    "name": "Meeting Name",
    "uuid": "NYoc2aL6",
    "participants": [
        {
            "id": "JLKGZnfFkGvX9DHgz",
            "status": "joined",
            "name": "Guest 03"
        },
        {
            // newly invited user, user hasn't logged in with invite url yet
            "id": "",
            "status": "invited",
            "name": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="b6d3dbd7dfdaf6d3dbd7dfda98d5d9db">[email protected]</a>"
        }
    ]
}

Now, I want to synchronize the 'name' field with the corresponding name in the Users collection. Is there any automated process at the database level to achieve this, or will I have to manually update it in each location where the name is changed?

javascriptmongodbmeteor

Answer №1

In the world of Meteor development, there’s a pattern that tends to crop up frequently. By leveraging the matb33:collection-hooks package, you can effectively "hook" into collection updates and keep shared values synchronized. This process should ideally take place on the server-side to avoid any issues with accessing related documents.

Here's an example to illustrate this concept:

Meteor.users.after.update((userId, doc, fieldNames, modifier, options)=>{
  if ( fieldNames.indexOf('profile.name') > -1 ){ // the name was changed
    Meetings.update({ 'participants.id': doc._id },
      { $set: { 'participants.name': doc.profile.name }},
      { multi: true });
  }
});

Answer №2

As far as I'm aware, there isn't a built-in method to achieve this in Mongo or Meteor automatically. However, one possible approach could be extracting common fields from your document and linking them with an ID instead. This practice is referred to as "Database Normalization," where redundant data is removed from tables (or collections in Mongo) to avoid issues like the one you're facing.

Answer №3

One way to automate this process is by continuously monitoring the users database for any changes:

let usersObserver = Meteor.users.find();
usersObserver.observeChanges({"changed":function(id, fields){
    if(fields.profile.name){
        // Perform the necessary actions here
    }
}});

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