'unsubscribe' best practices / Firebase / AngularFire2

[Jörg Wiesmann]

Hi,

i would like to understand what might be the best practice to unsubscribe from my observables.

Right now i am doing it more or less instantly if a Component gets destroyed, or i am not doing it at all (for like super frequent pages / components)

In some cases i can see why it would be useful to unsubscribe, but lets say i have some activities in my application. 

The first time loading takes a little while, but after that it is super fast. But only if i do not unsubscribe.

So what kind of numbers / experience are good values? 

Can i keep up like 100 subscriptions without worrying about it? Should i better unsubscribe all of them? 

What would you suggest? 

Thank you :)

[Kato Richardson]

Hi Jorg,

As a general rule, if you are subscribing within a component, do this on OnInit, and then unsubscribe in the OnDestroy method for your component.

If you have a data set that is frequently accessed by multiple users, then create a service and subscribe there. Probably no need to unsubscribe from this as long as you keep the query size reasonable (i.e. it's not going to fill available memory). Otherwise, you'd need to come up with some scheme based on your use case for when the data is no longer useful.

☼, Kato

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