Anyone familiar with and wi

Question

Anyone familiar with <https github com dropbox Store> and willing to explain how it s meant to be used I thought it was straight forward until I couldn t find a way to get all the data How should on do a `getAll` on the data in the store

no · Answer

< friendlymike> might know a bit about it

Orhan Tozan · Answer

He doesn t seem to be online at the moment unfortunately disappointed

Ahmed Ibrahim · Answer

I think I can help you you can consider the getAll thing as a request key Something like ```sealed class RequestKey object All RequestKey ``` and when you want to use the store `store stream StoreRequest fresh RequestKey All `

Orhan Tozan · Answer

Ah ok I thought about that indeed So then you pass the fetcher with a when statement that makes the different api call based on the RequestKey right But what about the OutputType Sometimes I would want to get all the Users and sometime just one user by id Would that be something like this

Orhan Tozan · Answer

```sealed class Response data class AllUsers val users List lt User gt Response data class User val user User Response ```

Orhan Tozan · Answer

Which would give you the following Store `val userStore Store lt RequestKey Response gt `

Orhan Tozan · Answer

Would that be the correct intended way of using the Store library

Ahmed Ibrahim · Answer

That could be one way to use yes But If I were you I d just make the OutputType as `List lt User gt ` to make it simpler and handle it based on the request key that you ve requested

Ahmed Ibrahim · Answer

If you really want to keep the `Response` as sealed class then you can just do a `filterIsInstance lt Response AllUsers gt ` to handle the all users response

Orhan Tozan · Answer

Ah ok and then when I use the requestKey ById I would know I get a list of users with a size of 1 That might be less verbose indeed Is it intended that I create a Store for ever model So if my app existed of Users and Posts I would have a UserStore and PostStore

Ahmed Ibrahim · Answer

Yes theoretically you can use one Store for everything and use sealed classes to differentiate between input and outputs but of course I d advice against this practice and keep different entities into different stores

Orhan Tozan · Answer

Ok but won t the caching system fail with multiple request keys For example I request all users from the store with the RequestKey All which it gets cached automatically by the Store Now I ask from the same store user by id=4 so RequestKey ById 4 Correct me if I m wrong but won t the Store then make a network request to get user id=4 despite the fact that it already has all the users cached by the previous call

Ahmed Ibrahim · Answer

AFAIR If you assign a SourceOfTruth to Store it will check first the key inside the DB and if it s not there then it will get it from network Since you already had the RequestKey All cache stuff in the DB once you do a ById 4 you will get the User from the DB without going through the network

Ahmed Ibrahim · Answer

You can check this method for details <https github com dropbox Store blob 61762f2f964aa68a4ed74282d3950c4dc99597e2 store src main java com dropbox android external store4 impl RealStore kt L158>

tjohnn · Answer

Chris Banes used it in his tivi app maybe you can go through it

tjohnn · Answer

Orhan Tozan · Answer

< Ahmed Ibrahim> but when I am looking at the Source of Truth the Key is clearly meant for keys for single entity Otherwise the source of truth wouldn t have the deleteAll method besides the delete Key method would it