Handle when data in collections changes

1

Hi there. How should I use Tracker.autorun to handle when array in my collection changes length? Thanks for help.

2

Can you be a bit more specific? The answer will depend on what exactly you are trying to accomplish. For instance, if the array is part of a document in a Minimongo collection and you are using that document in a Blaze template, you don’t need Tracker.autorun at all.

3

I need to watch the size of the array from my mongo collection on server side. When array’s size = 2 I need to call one function and when it has 20 elements - call another. How can I do it?

4

If you really want to use Tracker.autorun server side, take a look at peerlibrary:server-autorun.

5

Thanks, I will try it.

6

I wouldn’t recommend using an autorun for that. Use a collection hook instead. Search Fastosphere for collection hook.

7

I’m really curious about this. If you can share it, what’s the use case?

8

I’m using node.js proccess to change data in mongo. Collection hook fired only when data was changed from meteor as I can see.

9

Didn’t help for me. Probably I’m doing something wrong. Is there example or something?