So I was thinking about refactoring my code in the following way.
Meteor.call(\"RemoveNotification\", this._id, function(error, response){
}
an
I tried these a bit complex ways but then find the easies way - using the dburles:mongo-collection-instances package - https://atmospherejs.com/dburles/mongo-collection-instances It let's to access any collection by the collection name in variable:
let collName = "blabla";
Mongo.Collection.get(collName).find() // ... or any else