Question: tracking the results of a query on a store

[sbrunot]

Hi,

I still have trouble to figure out the collection and store tracking detailed specification from the current documentation (that, I understand, is a work in progress), hence my question.

Suppose the following sample code:

var store = ... // Observable store
var result = store.filter(...).sort(...).range(...);
result.track();

after this last line, does result become "live" and is guaranteed to be updated every time
the content of the store is ?

[kriszyp]

To clarify the intent of Observable#track, it is intended by used on the result set prior to the range() requests. The recommended usage would be:

var tracked = store.filter(...).sort(...).track();
var page = tracked.range(...);

We should clarify the API.

[sbrunot]

@kriszyp Thanks for the clarification.

In your example, does tracked becomes "live" and is guaranteed to be updated every time the content of the store is ? Or should you query the store once again to get the updated data when you receive an update / add / remove notification ?

[kriszyp]

To clarify, in my example tracked would be "live" if there is data associated with it (in the case of a Memory store). However, in the case of a Rest store, there would be no data associated with until you did a fetch(), so there would be nothing to keep "live". You shouldn't need to requery after a notification unless the source of the notification didn't provide any information about the index/position of the changes.

[brandonpayton]

@kriszyp and @sbrunot, it appears this has reached a resolution. Can it be closed?