Is there a way to dynamically arrange users based on their proximity to the current user in Meteor?

Struggling with the complexities of sorting data reactively in a Meteor application has been a recurring challenge for me. Despite countless attempts, I have never come across a satisfactory solution to achieve the desired outcome. Each time, I reluctantly abandon the idea and opt for a different approach, leaving me disheartened.

However, I am hopeful that by simplifying the issue at hand, I may receive a valuable and enlightening response. It seems feasible to implement in a Meteor app, so here is my query:

Within my Accounts.users collection, I store the latitude and longitude of user locations in variables "lat" and "lon". The objective is to provide the current user with a list of the 10 nearest users. How can this be achieved, especially considering the complexity involved in calculating distances based on latitude and longitude?

It appears challenging to include such calculations in a MongoDB query condition. How have others successfully tackled this problem?

Your insights into this matter, no matter how theoretical, would be greatly appreciated.

javascriptmongodbmeteorgeolocationdistance

Answer №1

Check out my functional demonstration at localgeo and view the source code on github

You can locate similar code snippet like this:

   var nearMarkers = allMarkers.find({
      location: {
        $near: {
          $geometry: {
            type: "Point",
            coordinates: location
          },
          $maxDistance: radius
        }
      }
    });

The location is in this format in MongoDB. And just a reminder: in MongoDB, longitude comes first, followed by latitude. It may seem counterintuitive, but that's how it works. I implemented this on the client side, but you can also publish it in a similar manner based on the radius parameter.

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