CODEWITHSUNDEEP
androidpagination
jasonR
jasonR

Reputation: 135

How can I convert PagingSource type in the modular app in android?

I have a modular app that has 3 modules feature and local and remote.

I used pagination in the feature module that used remoteMediator.

My remoteMediator use PagingSource<Int, UserModel> but when I want to get data from the Dao, I have a problem:

remoteMediator neede PagingSource<Int, UserMode> but the local database return PagingSource<Int, UserEntity>.

How can i convert PagingSource<Int, UserEntity> to PagingSource<Int, UserModel>?

My Dao:

@Dao
interface UsersDao {

    @Query("SELECT * FROM ${Constants.USERS_TABLE}")
    fun getAllUsers(): PagingSource<Int, UserEntity>

}

My Repository:

 override fun getUsers(): Flow<PagingData<UserModel>> {
        val pagingSourceFactory = {
            githubDatabase.usersDao().getAllUsers()
        }

        return Pager(
            config = PagingConfig(pageSize = ITEMS_PER_PAGE),
            remoteMediator = AllUsersPagingSource(
                githubApi = githubApi,
                githubDatabase = githubDatabase,
                allUsersMapper = allUsersMapper,
                allUsersRemoteLocalMapper = allUsersRemoteLocalMapper
            ), pagingSourceFactory = pagingSourceFactory
        ).flow
    }

Upvotes: 2

Views: 830

Answers (2)

MyNT
MyNT

Reputation: 188

I'm having the same problem. Currently, we can not apply any mapping to PagingSource, my solution is to apply the transformation to the flow from Pager:

return Pager(
    config = PagingConfig(pageSize = ITEMS_PER_PAGE),
    remoteMediator = RemoteMediator<Int, UserEntity>(), // your mediator's Value type is UserEntity, not the UserModel
    pagingSourceFactory = pagingSourceFactory
).flow.map { pagingData ->
    pagingData.map { userEntity ->
        userEntity.toUserModel() // convert UserEntity to UserModel
    }
}

Notice that the type of remote mediator is RemoteMediator<Int, UserEntity > (UserEntity, not UserModel).

Upvotes: 4

Shehab Alaa
Shehab Alaa

Reputation: 14

Did you try to apply mapper on the return data?
Use a mapper in a repository to map data from UserEntity to UserModel
Try something like this:
githubDatabase.usersDao().getAllUsers().map{ mapper.mapToModel(it) }
I hope this will be helpful for you.

Upvotes: -1

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