CODEWITHSUNDEEP
kotlinrx-javaandroid-room
RuNo280
RuNo280

Reputation: 583

Unable to use Completable in Room dao interface

I'm trying to use Completable in Dao class on @Insert annotated methods but when tried to compile the project, I've got this error:

error: Methods annotated with @Insert can return either void, long, Long, long[], Long[] or List<Long>.
public abstract io.reactivex.Completable insert(@org.jetbrains.annotations.NotNull()

Here my related codes:

@Insert
fun insert(kanal: Kanal): Completable
@Update
fun update(kanal: Kanal): Completable
@Delete
fun delete(kanal: Kanal): Completable

And my dependencies:

def room_version = "1.1.1"
implementation "android.arch.persistence.room:runtime:$room_version"
kapt "android.arch.persistence.room:compiler:$room_version"
implementation "android.arch.persistence.room:rxjava2:$room_version"
implementation 'io.reactivex.rxjava2:rxkotlin:2.2.0'
implementation 'io.reactivex.rxjava2:rxandroid:2.1.0'

According to this link it's supported by Room.

Upvotes: 8

Views: 5301

Answers (4)

Josef Vancura
Josef Vancura

Reputation: 1180

above didnt work for me, here is what i used in oder fix it

def room_version = "2.2.6"
implementation "androidx.room:room-runtime:$room_version"
annotationProcessor "androidx.room:room-compiler:$room_version"
// optional - RxJava support for Room
implementation "androidx.room:room-rxjava2:$room_version"
// optional - Guava support for Room, including Optional and ListenableFuture
implementation "androidx.room:room-guava:$room_version"
// optional - Test helpers
testImplementation "androidx.room:room-testing:$room_version"

Upvotes: 0

saujyun Lee
saujyun Lee

Reputation: 21

if you dont want to update the Room's Version, you can try to make a Completable return like this:

fun insertSomthing():Completable{
 return Completable.fromAction{
       insert(kanal: Kanal)
 }.subscribeOn(Schedulers.io())
}

Upvotes: 2

twenk11k
twenk11k

Reputation: 577

Completable isn't working with @Insert in 1.1.1 version of Room. You have to use 2.1.0 version or higher which is only available in Android X.

Make sure to use these dependencies instead of regular android.arch.persistence.room:

def room_version = "2.2.0-alpha02"
implementation "androidx.room:room-runtime:$room_version"
kapt "androidx.room:room-compiler:$room_version" // For Java use annotationProcessor instead of kapt
implementation "androidx.room:room-rxjava2:$room_version"
testImplementation "androidx.room:room-testing:$room_version"

Here's the link that provides all of the Android X dependencies of Room.

Upvotes: 2

musooff
musooff

Reputation: 6852

@Insert, @Update, and @Delete methods: Room 2.1.0 and higher supports return values of type Completable, Single, and Maybe.

Update your room from 1.1.1 to 2.1.0 or higher and it will work.

Upvotes: 14

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